diff --git a/README.md b/README.md
index ae29865..e82e21d 100644
--- a/README.md
+++ b/README.md
@@ -20,39 +20,16 @@ make all
 
 You need original DOS version files (distrubuted on CD) or Windows port files.
 
-You need to create following file in the root of the game folder 
+You need to create or update `skeldal.ini` following file in the root of the game folder 
 
-**WSKELDAL.INI**
+The `skeldal.ini` must be at current folder or you can specify config using command line option
 
 ```
-CESTA_MAPY ./maps/
-CESTA_MUSIC ./music/
-CESTA_VIDEO ./video/
-CESTA_DATA ./
-CESTA_POZICE ./savegame/
-CESTA_TEMPY /tmp/
-vmode 0
-sound_device 9 0 0 0
-SOUND_MIXFREQ 44100
-default_map lespred.map
-ZOOM_SPEED 8
-TURN_SPEED 8
-MUSIC_VOLUME 127
-SOUND_VOLUME 255
-PRELOAD 0
-AUTOSAVE 8
-WINDOWED 1
-SKIP_INTRO 8
-FULLRESVIDEO 0
-DEBUG 0
-GAME_SPEED 6
-BATTLE_ACCEL 0
-WINDOWEDZOOM 0
-EXTRAS 0
+$ ./skeldal
+$ ./skeldal -f conf/skeldal.ini
 ```
-(the final format of the configuration file is subject of change)
 
-Move to root folder of the original game and run the built binary 
+The documentation of the configuration file is in the file.
 
 ## todo
 
diff --git a/game/automap.c b/game/automap.c
index cb5b718..03e094c 100644
--- a/game/automap.c
+++ b/game/automap.c
@@ -242,7 +242,7 @@ void psani_poznamek_event(EVENT_MSG *msg,void **data)
      {
      char c;
 
-     c=va_arg(msg->data, int);
+     c=quit_request_as_escape(va_arg(msg->data, int));
      set_font(H_FLITT5,NOSHADOW(0));
      if (c)
         {
@@ -630,7 +630,7 @@ void *map_keyboard(EVENT_MSG *msg,void **usr)
   if (msg->msg==E_AUTOMAP_REDRAW) draw=4;
   if (msg->msg==E_KEYBOARD)
      {
-      int d = va_arg(msg->data, int);
+      int d = quit_request_as_escape(va_arg(msg->data, int));
      c=d>>8;
      switch (c)
         {
@@ -773,13 +773,13 @@ static void wire_glob_map_control(void)
 
 char map_menu(int id,int xa,int ya,int xr,int yr)
   {
-  char *s;
-  word *c;
+  const char *s;
+  const word *c;
 
   ya;xa;id;
   id=set_select_mode(0);
   s=ablock(H_CHARGENM);
-  c=ablock(H_CHARGENM);
+  c=(const word *)s;
   s+=*c*yr+xr+6;
   id=*s;
   if (!id) return 1;
@@ -897,7 +897,7 @@ void map_teleport_keyboard(EVENT_MSG *msg,void **usr)
   {
   usr;
   if (msg->msg==E_KEYBOARD) {
-      int c = va_arg(msg->data, int);
+      int c = quit_request_as_escape(va_arg(msg->data, int));
      switch (c>>8)
         {
         case 1:
diff --git a/game/builder.c b/game/builder.c
index b74f112..85fd654 100644
--- a/game/builder.c
+++ b/game/builder.c
@@ -287,14 +287,14 @@ word *bott_clear(void)
 
 static void draw_small_icone(int num,int x,int y)
   {
-  word *pic;
+  const word *pic;
 
   pic=ablock(H_POSTUP);
   num*=13;x+=num;
   put_textured_bar(pic,x,y,13,13,num,0);
   }
 
-static void bott_fletna_normal(void **pp,int32_t *s)
+static const void *bott_fletna_normal(const void *pp, int32_t *s)
   {
   word *bott_scr;
   int i,x;
@@ -307,12 +307,13 @@ static void bott_fletna_normal(void **pp,int32_t *s)
      {
      set_aligned_position(x,32,1,1,texty[180+i]);outtext(texty[180+i]);
      }
-  *pp=GetScreenAdr();
+  void *out=GetScreenAdr();
   *s=GetScreenSizeBytes();
   RestoreScreen();
+  return out;
   }
 
-static void bott_draw_normal(void **pp,int32_t *s)
+static const void *bott_draw_normal(const void *pp, int32_t *s)
   {
   int i,j;int x,xs=0,y;
   word *bott_scr;
@@ -404,9 +405,10 @@ static void bott_draw_normal(void **pp,int32_t *s)
         outtext(s);
         }
  */
-  *pp=GetScreenAdr();
+  void *out = GetScreenAdr();
   *s=GetScreenSizeBytes();
   RestoreScreen();
+  return out;
   }
 
 
@@ -420,7 +422,7 @@ void bott_timer_draw(struct the_timer *q)
   bott_timer=NULL;
   }
 
-void bott_disp_text_proc(void **pp,int32_t *ss)
+const void *bott_disp_text_proc(const void *pp, int32_t *ss)
   {
   char *p,*text;
   int y=20;
@@ -442,9 +444,10 @@ void bott_disp_text_proc(void **pp,int32_t *ss)
      p=strchr(p,0)+1;
      }
   while (p[0]);
-  *pp=GetScreenAdr();
+  void *out = GetScreenAdr();
   *ss=GetScreenSizeBytes();
   RestoreScreen();
+  return out;
   }
 
 void bott_disp_text(const char *text)
@@ -460,7 +463,7 @@ void bott_disp_text(const char *text)
   strcpy(bott_text,text);
   }
 
-static void MaskPutPicture(int x, int y, char mask, word color, char blend, void *pic)
+static void MaskPutPicture(int x, int y, char mask, word color, char blend, const void *pic)
   {
   short *info=(short *)pic;
   char *data=(char *)(info+3+256);
@@ -479,7 +482,7 @@ static void MaskPutPicture(int x, int y, char mask, word color, char blend, void
   }
 
 
-void bott_draw_rune(void **pp,int32_t *ss)
+const void *bott_draw_rune(const void *pp, int32_t *ss)
   {
   int sel_zivel=showrune/10;
   int sel_rune=showrune%10;
@@ -504,9 +507,10 @@ void bott_draw_rune(void **pp,int32_t *ss)
   position (75,60);
   outtext(buff);
   put_picture(70,30,ablock(glob_items[showruneitem].vzhled+face_arr[0]));
-  *pp=GetScreenAdr();
+  void *out = GetScreenAdr();
   *ss=GetScreenSizeBytes();
   RestoreScreen();
+  return out;
   }
 
 void bott_disp_rune(char rune, int item)
@@ -527,14 +531,15 @@ void bott_text_forever()
   bott_timer=NULL;
   }
 
-void bott_draw_proc(void **p,int32_t *s)
+const void *bott_draw_proc(const void *p, int32_t *s)
   {
   switch (bott_display)
      {
-     case BOTT_NORMAL:bott_draw_normal(p,s);break;
-     case BOTT_TEXT:bott_disp_text_proc(p,s);break;
-     case BOTT_FLETNA:bott_fletna_normal(p,s);break;
-	 case BOTT_RUNA:bott_draw_rune(p,s);break;
+     case BOTT_NORMAL:return bott_draw_normal(p,s);break;
+     case BOTT_TEXT:return bott_disp_text_proc(p,s);break;
+     case BOTT_FLETNA:return bott_fletna_normal(p,s);break;
+	 case BOTT_RUNA:return bott_draw_rune(p,s);break;
+	 default: return p;
      }
   }
 
@@ -562,7 +567,7 @@ void bott_draw_fletna()
 void draw_spell(int handle,int phase,int xicht)
   {
   int x,y,i;
-  word *w;
+  const word *w;
   int32_t scr_linelen2 = GetScreenPitch();
 
 
@@ -721,9 +726,9 @@ static __inline int toInt( float fval )
 }
 
 
-static void *check_autofade(void *image, char ceil, int dark)
+static const void *check_autofade(const void *image, char ceil, int dark)
 {
-  char *data=image;
+    const char *data=image;
   if (data[5]==0x80)
   {
     word *xy=(word *)image;
@@ -781,7 +786,7 @@ int draw_basic_floor(int celx,int cely,int sector)
 
 static int calc_item_shiftup(TITEM *it)
   {
-  short *s;
+    const short *s;
   char *c;
   int y,x,xs,ys,t;
 
@@ -1098,7 +1103,7 @@ static char set_blind(void) {
 
 extern char folow_mode;
 
-static void zobraz_lodku(word *lodka, word *screen, int size)
+static void zobraz_lodku(const word *lodka, word *screen, int size)
   {
     int32_t scr_linelen2 = GetScreenPitch();
 
@@ -1193,8 +1198,8 @@ void render_scene(int sector, int smer)
 //  trace_for_bgr(smer);
   i=VIEW3D_Z-1;
   s=minimap[i][VIEW3D_X];
-  if (s && !map_sectors[s].ceil) clear_buff(ablock(H_BGR_BUFF),back_color,360);
-  else clear_buff(ablock(H_BGR_BUFF),back_color,80);
+  if (s && !map_sectors[s].ceil) clear_buff(ablock_copy(H_BGR_BUFF),back_color,360);
+  else clear_buff(ablock_copy(H_BGR_BUFF),back_color,80);
   for(i=-VIEW3D_X+1;i<VIEW3D_X;i++)
      if ((s=minimap[VIEW3D_Z-1][VIEW3D_X+i])!=0)
         if (map_coord[s].flags & MC_SHADING) back_clear(i,0);
@@ -1336,7 +1341,7 @@ static FX_PLAY *fx_data=NULL;
 
 void draw_fx()
   {
-  word *c;
+    const word *c;
   FX_PLAY *fx;
   FX_PLAY **last;
 
diff --git a/game/chargen.c b/game/chargen.c
index 8b7ce58..757da6b 100644
--- a/game/chargen.c
+++ b/game/chargen.c
@@ -227,7 +227,7 @@ static void draw_other_bar()
   int i;
   int32_t scr_linelen2 = GetScreenPitch();
 
-  word *bbar=ablock(H_BOTTBAR);
+  const word *bbar=ablock(H_BOTTBAR);
   word *screen=GetScreenAdr()+(480-102)*scr_linelen2;
   for (i=0;i<102;i++,screen+=scr_linelen2,bbar+=scr_linelen2) memcpy(screen,bbar,scr_linelen2*2);
   //put_8bit_clipped(ablock(H_GEN_OKBUTT),378*640+520+screen,0,120,102);
@@ -239,7 +239,7 @@ static void draw_other_bar()
 
 static void display_character(THUMAN *p,char i)
   {
-  word *w;
+    const word *w;
  put_picture(4,SCREEN_OFFLINE,ablock(H_IOBLOUK));
  if (p->used)
      {
@@ -277,11 +277,11 @@ static void vypocet_perly(int angle,int xp,int yp,int *x,int *y)
 
 static void zobraz_perlu(void)
   {
-  word *perla;
+    const word *perla;
   int x,y;
   word *scr,*sss;
   char *p;
-  word *b;
+  const word *b;
   int xs,ys,xxs;
 
   int32_t scr_linelen2 = GetScreenPitch();
@@ -567,7 +567,6 @@ static void def_entries()
 
      sprintf(s,CHAR_NAME,i);
      def_handle(H_GEN_POSTAVY+i,s,pcx_8bit_decomp,SR_BGRAFIKA);
-     apreload(H_GEN_POSTAVY+i);
      mix_back_sound(0);
      }
   for(i=0;i<MAX_XICHTS;i++)
@@ -576,14 +575,13 @@ static void def_entries()
 
      sprintf(s,XICHT_NAME,i);
      def_handle(H_GEN_XICHTY+i,s,pcx_8bit_decomp,SR_BGRAFIKA);
-     apreload(H_GEN_XICHTY+i);
      mix_back_sound(0);
      }
   }
 
 static char go_next_page(int id,int xa,int ya,int xr,int yr)
   {
-  word *w;
+    const word *w;
   char *b;
 
   xa,ya;
@@ -714,7 +712,7 @@ char potvrzeno(char *text,void (*redraw)(char))
 
 static char view_another_click2(int id,int xa,int ya,int xr,int yr)
   {
-  short *w;
+    const short *w;
 
   id,xa,ya,xr,yr;
   w=ablock(H_OKNO);
@@ -760,21 +758,28 @@ static void enter_reaction(EVENT_MSG *msg,void **unused)
   if (msg->msg==E_KEYBOARD)
      {
       int c = va_arg(msg->data, int);
-     if (c==13 && !shut_downing_text)
+      if ((c >> 1) == 1 || c == E_QUIT_GAME_KEY) {
+          gen_exit_editor(2,0,0,0,0);
+          return;
+      } else if ((c & 0xFF)==13 && !shut_downing_text)
         {
         send_message(E_KEYBOARD,13);
         bott_draw(1);
         redraw_generator(1);
         msg->msg=-1;
+        was_enter=1;
         }
-     was_enter=1;
      }
   }
 
 static void enter_reaction2(EVENT_MSG *msg,void **_)
   {
   int c = va_arg(msg->data, int);
-  if (msg->msg==E_KEYBOARD && c==13 && !shut_downing_text && ~b_disables & 0x3)
+  if ((c >> 1) == 1 || c == E_QUIT_GAME_KEY) {
+      gen_exit_editor(1,0,0,0,0);
+      return;
+  }
+  if (msg->msg==E_KEYBOARD && (c & 0xFF)==13 && !shut_downing_text && ~b_disables & 0x3)
      {
      send_message(E_KEYBOARD,13);
      bott_draw(1);
@@ -804,6 +809,7 @@ char gen_exit_editor(int id,int xa,int ya,int xr,int yr)
      }
   else
      {
+      game_display_cancel_quit_request();
      if (id==2)redraw_generator(1);
      else redraw_svitek(0);
      edit_name();
@@ -848,10 +854,13 @@ char enter_generator()
        {
        send_message(E_ADD,E_KEYBOARD,enter_reaction);
        EVENT_MSG *ev= task_wait_event(E_CLOSE_GEN);;
-       i=va_arg(ev->data, int);
+       i=ev?va_arg(ev->data, int):255;
        send_message(E_DONE,E_KEYBOARD,enter_reaction);
        if (i==3 && potvrzeno(texty[116],redraw_generator)) goto znova;
-       if (i==255) return 1;
+       if (i==255) {
+           term_task(edit_task);
+           return 1;
+       }
        }
      while (cur_xicht==-1 || i==3);
      send_message(E_KEYBOARD,13);
diff --git a/game/clk_map.c b/game/clk_map.c
index f6d28f7..5671000 100644
--- a/game/clk_map.c
+++ b/game/clk_map.c
@@ -67,7 +67,7 @@ char clk_touch_vyk(int sector,int side,int xr,int yr)
      else
         {
         int fc;
-        word *w;
+        const word *w;
         for(i=0;v->items[i];i++);
         if (i==8)
            {
@@ -202,7 +202,10 @@ char konec(int id,int xa,int ya,int xr,int yr)
   if (cur_mode==MD_ANOTHER_MAP) unwire_proc(),wire_proc();
   send_message(E_CLOSE_MAP);
   }
- else wire_proc();
+ else {
+     wire_proc();
+     game_display_cancel_quit_request();
+ }
  return 1;
  }
 
@@ -234,7 +237,7 @@ char start_invetory(int id,int xa,int ya,int xr,int yr)
   {
   THUMAN *p;
   int i;
-  word *xs;
+  const word *xs;
 
   id;xa;ya;yr;
   if (cur_mode==MD_ANOTHER_MAP) unwire_proc(),wire_proc();
@@ -382,7 +385,7 @@ char empty_clk(int id,int xa,int ya,int xr,int yr) //tato udalost slouzi ke zrus
 
 static char sing_song_clk(int id,int xa,int ya,int xr,int yr)
   {
-  char *xadr;
+  const char *xadr;
   word *xs;
   static char playing=0;
   char standardflute=map_sectors[viewsector].sector_type>=S_FLT_SMER &&
diff --git a/game/dialogy.c b/game/dialogy.c
index 1709ef9..571d06d 100644
--- a/game/dialogy.c
+++ b/game/dialogy.c
@@ -125,16 +125,16 @@ static int glob_y;
 
 static int last_pgf;
 
-static word *paleta;
+static const word *paleta;
 static int32_t loc_anim_render_buffer;
 static short task_num=-1;
 
-void small_anm_buff(void *target,void *buff,void *paleta);
+void small_anm_buff(void *target,const void *buff,const void *paleta);
 //#pragma aux small_anm_buff parm[edi][esi][ebx] modify [eax ecx]
-void small_anm_delta(void *target,void *buff,void *paleta);
+void small_anm_delta(void *target,const void *buff,const void *paleta);
 //#pragma aux small_anm_delta parm[edi][esi][ebx] modify [eax ecx]
 
-static void animace_kouzla(int act,void *data,int csize)
+static void animace_kouzla(int act,const void *data,int csize)
   {
   word *p=GetScreenAdr()+loc_anim_render_buffer;
   switch (act)
@@ -154,7 +154,7 @@ static void dialog_anim(va_list args)
   int speed=va_arg(args,int);
   int rep=va_arg(args,int);
 
-  void *anm;
+  const void *anm;
   void *aptr;
   char hid;
   int spdc=0,cntr=rep,tm,tm2;
@@ -235,7 +235,7 @@ static T_PARAGRAPH *find_paragraph(int num)
   T_PARAGRAPH *z;
 
   num+=local_pgf;
-  pp=(int *)ablock(H_DIALOGY_DAT);
+  pp=(int *)ablock_copy(H_DIALOGY_DAT);
   pocet=*pp;pp+=2;
   z=(T_PARAGRAPH *)pp;
   for(i=0;i<pocet;i++,z++) if (z->num==(unsigned)num) return z;
@@ -256,7 +256,7 @@ static int find_pgnum(char *pc)
   int pocet;
   int pcc,i;
 
-  pp=(int *)ablock(H_DIALOGY_DAT);
+  pp=(int *)ablock_copy(H_DIALOGY_DAT);
   pocet=*pp;pp+=2;
   pcc=pc-(char *)pp-8-sizeof(T_PARAGRAPH)*pocet;
   z=(T_PARAGRAPH *)pp;
@@ -275,7 +275,7 @@ static void goto_paragraph(int prgf)
      if (z->visited) z->first=1;
      if (z->alt==z->num || !z->visited)
         {
-        pc=((char *)ablock(H_DIALOGY_DAT))+*((int *)ablock(H_DIALOGY_DAT))*sizeof(T_PARAGRAPH)+8+z->position;
+        pc=((char *)ablock_copy(H_DIALOGY_DAT))+*((int *)ablock_copy(H_DIALOGY_DAT))*sizeof(T_PARAGRAPH)+8+z->position;
         last_pgf=prgf;
         z->visited=1;
         return;
@@ -527,7 +527,7 @@ static int get_last_his_line()
 
 static void draw_all()
   {
-  void *c;
+  const void *c;
   show_desc();
   if (back_pic_enable) c=back_pic;else c=ablock(H_DIALOG_PIC);
   other_draw();
@@ -991,7 +991,7 @@ static char ask_who_proc(int id,int xa,int ya,int xr,int yr)
   {
   THUMAN *p;
   int i;
-  word *xs;
+  const word *xs;
 
   if (id==2)
      {
@@ -1367,7 +1367,7 @@ char save_dialog_info(TMPFILE_WR *f)
   T_PARAGRAPH *q;
 
   SEND_LOG("(DIALOGS)(SAVELOAD) Saving dialogs info...");
-  p=ablock(H_DIALOGY_DAT);
+  p=ablock_copy(H_DIALOGY_DAT);
   pgf_pocet=*p;
   temp_storage_write(&pgf_pocet,1*4,f);
   siz=(pgf_pocet+3)/4;
@@ -1375,7 +1375,7 @@ char save_dialog_info(TMPFILE_WR *f)
      {
      c=getmem(siz);
      memset(c,0,siz);
-     p=ablock(H_DIALOGY_DAT);
+     p=ablock_copy(H_DIALOGY_DAT);
      q=(T_PARAGRAPH *)(p+2);
      for(i=0;i<pgf_pocet;i++)
        {
@@ -1399,7 +1399,7 @@ char load_dialog_info(TMPFILE_RD *f)
   T_PARAGRAPH *q;
 
   SEND_LOG("(DIALOGS)(SAVELOAD) Loading dialogs info...");
-  p=ablock(H_DIALOGY_DAT);
+  p=ablock_copy(H_DIALOGY_DAT);
   aswap(H_DIALOGY_DAT);
   temp_storage_read(&pgf_pocet,1*4,f);
   siz=(pgf_pocet+3)/4;
@@ -1413,7 +1413,7 @@ char load_dialog_info(TMPFILE_RD *f)
      {
      c=getmem(siz);
      res|=(temp_storage_read(c,1*siz,f)!=siz);
-     p=ablock(H_DIALOGY_DAT);
+     p=ablock_copy(H_DIALOGY_DAT);
      q=(T_PARAGRAPH *)(p+2);
      for(i=0;i<pgf_pocet;i++)
        {
diff --git a/game/enemy.c b/game/enemy.c
index 376930d..5ad7a49 100644
--- a/game/enemy.c
+++ b/game/enemy.c
@@ -203,7 +203,7 @@ void init_mobs()
   send_message(E_ADD,E_KOUZLO_KOLO,mob_reload);
   }
 
-static void register_mob_graphics(int num,char *name_part,char *anims,char *seq)
+static void register_mob_graphics(int num,char *name_part,const char *anims,const char *seq)
   {
   char fulname[14];
   char znaky[]=MOB_ZNAKY;
@@ -949,9 +949,9 @@ void draw_blood(int zasah,int celx,int cely,int posx,int posy)
   draw_placed_texture(ablock(H_MZASAH1+zasah-1),celx,cely,posx+64,posy+64,75,0);
   }
 */
-static void *mob_select_palette(TMOB *p)
+static const void *mob_select_palette(TMOB *p)
   {
-  char *palet;
+  const char *palet;
 
   palet=ablock(p->cislo_vzoru+6*16+4+monster_block);
   return palet+(p->palette)*PIC_FADE_PAL_SIZE;
diff --git a/game/engine1.c b/game/engine1.c
index 0128a40..8ba1fd0 100644
--- a/game/engine1.c
+++ b/game/engine1.c
@@ -76,7 +76,7 @@ void scroll_support_64(void *lbuf,void *src1,void *src2,int size1,void *xlat);
 //#pragma aux scroll_support_64 parm [EDI][ESI][EDX][ECX][EBX] modify [EAX];
 void scroll_support_64b(void *lbuf,void *src1,void *src2,int size1,void *xlat);
 //#pragma aux scroll_support_64b parm [EDI][ESI][EDX][ECX][EBX] modify [EAX];*/
-void fcdraw(void *source,void *target, void *table);
+void fcdraw(const void *source,void *target,const  void *table);
 //#pragma aux fcdraw parm [EDX][EBX][EAX] modify [ECX ESI EDI];
 
 /*void lodka32(void *source,void *target,void *background,void *xlat,int32_t xysize);
@@ -451,7 +451,7 @@ void create_zooming(void)
      }
   }
 
-static void zooming_forward_backward(word *background,char back)
+static void zooming_forward_backward(const word *background,char back)
   {
   if (!zooming_step) return;
     {
@@ -477,12 +477,12 @@ static void zooming_forward_backward(word *background,char back)
     }
   }
 
-void zooming_forward(word *background)
+void zooming_forward(const word *background)
   {
   zooming_forward_backward(background,0);
   }
 
-void zooming_backward(word *background)
+void zooming_backward(const word *background)
   {
   zooming_forward_backward(background,1);
   }
@@ -577,12 +577,13 @@ void turn_right()
       */
   }
 
-void show_cel(int celx,int cely,void *stena,int xofs,int yofs,char rev)
+void show_cel(int celx,int cely,const void *stena,int xofs,int yofs,char rev)
   {
   T_INFO_X_3D *x3d,*x0d;
   T_INFO_Y *yd,*yp;
   int txtsx,txtsy,realsx,realsy,x,i,yss,ysd;
-  char *p;int plac;
+  const char *p;
+  int plac;
 
   int32_t scr_linelen2 = GetScreenPitch();
 
@@ -649,12 +650,13 @@ void show_cel(int celx,int cely,void *stena,int xofs,int yofs,char rev)
  }
 
 
-void show_cel2(int celx,int cely,void *stena,int xofs,int yofs,char rev)
+void show_cel2(int celx,int cely,const void *stena,int xofs,int yofs,char rev)
   {
   T_INFO_X *x3d;
   T_INFO_Y *yd;
   int txtsx,txtsy,realsx,realsy,x,i;
-  char *p;int plac;
+  const char *p;
+  int plac;
 
   int32_t scr_linelen2 = GetScreenPitch();
 
@@ -716,7 +718,7 @@ void show_cel2(int celx,int cely,void *stena,int xofs,int yofs,char rev)
 
 
 
-void draw_floor_ceil(int celx,int cely,char f_c,void *txtr)
+void draw_floor_ceil(int celx,int cely,char f_c,const void *txtr)
   {
   int y;
 
@@ -1051,7 +1053,7 @@ void map_pos(int celx,int cely,int posx,int posy,int posz,int *x,int *y)
 */
 
 static int items_indextab[][2]={{0,0},{-1,3},{1,7},{-1,7},{1,10},{-1,10},{0,10},{-2,15}};
-void draw_item(int celx,int cely,int posx,int posy,short *txtr,int index)
+void draw_item(int celx,int cely,int posx,int posy,const short *txtr,int index)
   {
   int x,y;
   int clipl,clipr;
@@ -1076,10 +1078,10 @@ void draw_item(int celx,int cely,int posx,int posy,short *txtr,int index)
   }
 
 
-void put_textured_bar(void *src,int x,int y,int xs,int ys,int xofs,int yofs)
+void put_textured_bar(const void *src,int x,int y,int xs,int ys,int xofs,int yofs)
   {
   word *pos;
-  word *xy;
+  const word *xy;
   int32_t scr_linelen2 = GetScreenPitch();
 
 
@@ -1092,7 +1094,7 @@ void put_textured_bar(void *src,int x,int y,int xs,int ys,int xofs,int yofs)
   put_textured_bar_(src,pos,xs,ys,xofs,yofs);
   }
 
-void draw_placed_texture(short *txtr,int celx,int cely,int posx,int posy,int posz,char turn)
+void draw_placed_texture(const short *txtr,int celx,int cely,int posx,int posy,int posz,char turn)
   {
   int x,y;
   int clipl,clipr;
@@ -1295,7 +1297,7 @@ void draw_enemy(DRW_ENEMY *drw)
     }
 }
 
-void draw_player(short *txtr,int celx,int cely,int posx,int posy,int adjust,char *name)
+void draw_player(  const short *txtr,int celx,int cely,int posx,int posy,int adjust,  const char *name)
   {
   int x,y,yc,lx,sd;
   int clipl,clipr;
@@ -1330,7 +1332,7 @@ void draw_player(short *txtr,int celx,int cely,int posx,int posy,int adjust,char
   }
 
 
-void draw_spectxtr(short *txtr,int celx,int cely,int xpos)
+void draw_spectxtr(const short *txtr,int celx,int cely,int xpos)
   {
   int x,y,clipl,clipr;
   int32_t scr_linelen2 = GetScreenPitch();
@@ -1349,7 +1351,7 @@ void draw_spectxtr(short *txtr,int celx,int cely,int xpos)
   }
 
 
-void draw_item2(int celx,int cely,int xpos,int ypos,void *txtr,int index)
+void draw_item2(int celx,int cely,int xpos,int ypos,  const void *txtr,int index)
   {
   int x,y,xs,ys,abc,asc,clipl,clipr;
   static int indextab[][2]={{0,0},{0,1},{1,0},{-1,0},{1,2},{-1,1},{-2,1},{2,1}};
@@ -1441,7 +1443,7 @@ void set_backgrnd_mode(int mode)
   backgrnd_mode=mode;
   }
 
-int get_item_top(int celx,int cely,int posx,int posy,word *txtr,int index)
+int get_item_top(int celx,int cely,int posx,int posy,const word *txtr,int index)
   {
   int x,y;
   int randx,randy;
diff --git a/game/engine1.h b/game/engine1.h
index 4416000..2114f94 100644
--- a/game/engine1.h
+++ b/game/engine1.h
@@ -28,19 +28,19 @@
 
 
 void general_engine_init(void);
-void draw_floor_ceil(int celx,int cely,char f_c,void *txtr);
-void show_cel2(int celx,int cely,void *stena,int xofs,int yofs,char rev);
+void draw_floor_ceil(int celx,int cely,char f_c,const void *txtr);
+void show_cel2(int celx,int cely,const void *stena,int xofs,int yofs,char rev);
   //zobrazi primou stenu ktera lezi pred nebo napravo od pozorovatele
-void show_cel(int celx,int cely,void *stena,int xofs,int yofs,char rev);
+void show_cel(int celx,int cely,const void *stena,int xofs,int yofs,char rev);
   void turn_left(void);
 void turn_right(void);
-void zooming_backward(word *background);
-void zooming_forward(word *background);
+void zooming_backward(const word *background);
+void zooming_forward(const word *background);
 void OutBuffer2nd(void);
 void CopyBuffer2nd(void);
 void report_mode(int);
-void draw_item(int celx,int cely,int posx,int posy,short *pic,int index);
-void draw_item2(int celx,int cely,int xpos,int ypos,void *texture,int index);
+void draw_item(int celx,int cely,int posx,int posy,const short *pic,int index);
+void draw_item2(int celx,int cely,int xpos,int ypos,const void *texture,int index);
 //void textmode_effekt(void);
 //#pragma aux textmode_effekt modify[eax ebx ecx edx edi];
 
@@ -49,7 +49,8 @@ void clear_buff(word *background,word backcolor,int lines);
 
 typedef struct zoominfo
   {
-     void *startptr, *texture;
+     void *startptr;
+     const void *texture;
      int32_t texture_line,line_len;
      int32_t *xtable;
      short *ytable;
@@ -122,41 +123,41 @@ typedef short palette_t[256];
 
 typedef struct drw_enemy_struct
   {
-  void *txtr;
+  const void *txtr;
   int celx,cely,posx,posy,adjust,shiftup,num;
   char mirror;
   char stoned;
-  palette_t *palette;
+  const palette_t *palette;
   }DRW_ENEMY;
 
 
 
 
-void enemy_draw(void *src,void *trg,int shade,int scale,int maxspace,int clip);
+void enemy_draw(const void *src,void *trg,int shade,int scale,int maxspace,int clip);
 //#pragma aux enemy_draw parm[ESI][EDI][EBX][EDX][EAX][ECX]
-void enemy_draw_transp(void *src,void *trg,void *shade,int scale,int maxspace,int clip);
+void enemy_draw_transp(const void *src,void *trg,  const void *shade,int scale,int maxspace,int clip);
 //#pragma aux enemy_draw_transp parm[ESI][EDI][EBX][EDX][EAX][ECX]
-void enemy_draw_mirror_transp(void *src,void *trg,void *shade,int scale,int maxspace,int clip);
+void enemy_draw_mirror_transp(const void *src,void *trg,  const void *shade,int scale,int maxspace,int clip);
 //#pragma aux enemy_draw_mirror_transp parm[ESI][EDI][EBX][EDX][EAX][ECX]
-void enemy_draw_mirror(void *src,void *trg,int shade,int scale,int maxspace,int clip);
+void enemy_draw_mirror(const void *src,void *trg,int shade,int scale,int maxspace,int clip);
 //#pragma aux enemy_draw_mirror parm[ESI][EDI][EBX][EDX][EAX][ECX]
 //clip je v poradi vpravo - vlevo (HiLo)
 
 void draw_enemy(DRW_ENEMY *drw);
-void draw_player(short *txtr,int celx,int cely,int posx,int posy,int adjust,char *name);
+void draw_player(const short *txtr,int celx,int cely,int posx,int posy,int adjust,  const char *name);
 
 void set_lclip_rclip(int celx,int cely,int lc,int rc);
-void draw_spectxtr(short *txtr,int celx,int cely,int xpos);
+void draw_spectxtr(const short *txtr,int celx,int cely,int xpos);
 
 int turn_speed(int turnspeed); //oba je nutne volat na zacatku
 int zoom_speed(int zoomspeed);
 
-void scroll_and_copy(void *pic,void *slide, void *scr, int size,int shift, void *lineinfo);
+void scroll_and_copy(const void *pic,void *slide, void *scr, int size,int shift, void *lineinfo);
 //#pragma aux scroll_and_copy parm[esi][ebx][edi][ecx][edx][eax]
 
 void set_backgrnd_mode(int mode);
 
-int get_item_top(int celx,int cely,int posx,int posy,word *txtr,int index);
+int get_item_top(int celx,int cely,int posx,int posy,const word *txtr,int index);
  //vraci nejnizsi souradnici y predmetu leziciho na zemi v celx, cely na pozici posx,posy;
 
 #endif
diff --git a/game/engine2.c b/game/engine2.c
index 544ff48..07c846d 100644
--- a/game/engine2.c
+++ b/game/engine2.c
@@ -155,7 +155,7 @@ skpskp: add     edx,2 ;dalsi hodnota v tabulce
 }
 
 
-void fcdraw(void *source,void *target, void *table)
+void fcdraw(const void *source,void *target, const void *table)
 //#pragma aux fcdraw parm [EDX][EBX][EAX] modify [ECX ESI EDI];
 {
 
@@ -445,7 +445,7 @@ shmad4: add     edi,scr_linelen
 
 
 
-void scroll_and_copy(void *pic,void *slide, void *scr, int _size,int shift, void *lineinfo)
+void scroll_and_copy(const void *pic,void *slide, void *scr, int _size,int shift, void *lineinfo)
 //#pragma aux scroll_and_copy parm[esi][ebx][edi][ecx][edx][eax]
 {
     int32_t scr_linelen2 = GetScreenPitch();
@@ -570,7 +570,7 @@ sac_end:sub     ecx,2           ;odecti counter
 #define ed_stk1 600*4
 
 
-void enemy_draw(void *src,void *trg,int shade,int scale,int maxspace,int clip)
+void enemy_draw(const void *src,void *trg,int shade,int scale,int maxspace,int clip)
 //#pragma aux enemy_draw parm[ESI][EDI][EBX][EDX][EAX][ECX]
 {
     int32_t scr_linelen2 = GetScreenPitch();
@@ -756,7 +756,7 @@ ed_err: add     esp,ed_stack;vymaz tabulku
 	}
 	*/
 }
-void enemy_draw_transp(void *src,void *trg,void *shade,int scale,int maxspace,int clip)
+void enemy_draw_transp(const void *src,void *trg,const void *shade,int scale,int maxspace,int clip)
 //#pragma aux enemy_draw_transp parm[ESI][EDI][EBX][EDX][EAX][ECX]
 {
 
@@ -945,7 +945,7 @@ et_err: add     esp,ed_stack;vymaz tabulku
 	}*/
 }
 
-void enemy_draw_mirror_transp(void *src,void *trg,void *shade,int scale,int maxspace,int clip)
+void enemy_draw_mirror_transp(const void *src,void *trg,const void *shade,int scale,int maxspace,int clip)
 //#pragma aux enemy_draw_mirror_transp parm[ESI][EDI][EBX][EDX][EAX][ECX]
 {
 
@@ -1132,7 +1132,7 @@ etmerr: add     esp,ed_stack;vymaz tabulku
 	}
 	*/
 }
-void enemy_draw_mirror(void *src,void *trg,int shade,int scale,int maxspace,int clip)
+void enemy_draw_mirror(const void *src,void *trg,int shade,int scale,int maxspace,int clip)
 //#pragma aux enemy_draw_mirror parm[ESI][EDI][EBX][EDX][EAX][ECX]
 //clip je v poradi vpravo - vlevo (HiLo)
 {
diff --git a/game/gamesave.c b/game/gamesave.c
index 506854c..3127284 100644
--- a/game/gamesave.c
+++ b/game/gamesave.c
@@ -1358,7 +1358,7 @@ static void saveload_keyboard(EVENT_MSG *msg,void **_)
   {
   if (msg->msg == E_KEYBOARD)
      {
-      int v = va_arg(msg->data, int);
+      int v = quit_request_as_escape(va_arg(msg->data, int));
      switch (v>>8)
         {
         case 1:unwire_proc();wire_proc();break;
@@ -1377,6 +1377,7 @@ static void saveload_keyboard(EVENT_MSG *msg,void **_)
 
 void unwire_save_load()
   {
+    term_task_wait(clk_ask_name[0].id);
   if (back_texture!=NULL) free(back_texture);
   back_texture=NULL;
   if (story_text!=NULL)release_list(story_text);
diff --git a/game/globals.h b/game/globals.h
index 6075374..8460728 100644
--- a/game/globals.h
+++ b/game/globals.h
@@ -6,6 +6,7 @@
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <libs/memman.h>
 
 #define POCET_POSTAV 6
 #define HODINA 360
@@ -470,7 +471,7 @@ typedef struct tdregisters
   {
   int h_num;
   char name[13];
-  void (*proc)(void **,int32_t *);
+  ABLOCK_DECODEPROC proc;
   char path;
   }TDREGISTERS;
 
@@ -646,17 +647,17 @@ void calc_animations(void);
 int load_map(char *filename);
 void other_draw(void);
 void refresh_scene(void);
-void pcx_fade_decomp(void **p,int32_t *s);
-void pcx_15bit_decomp(void **p,int32_t *s);
-void pcx_15bit_autofade(void **p,int32_t *s);
-void pcx_15bit_backgrnd(void **p,int32_t *s);
-void pcx_8bit_decomp(void **p,int32_t *s);
-void hi_8bit_correct(void **p,int32_t *s);
-void pcx_8bit_nopal(void **p,int32_t *s);
-void set_background(void **p,int32_t *s);
-void wav_load(void **p,int32_t *s);
-void load_mob_legacy_format(void **p, int32_t *s);
-void load_spells_legacy_format(void **p, int32_t *s);
+const void *pcx_fade_decomp(const void *p, int32_t *s);
+const void *pcx_15bit_decomp(const void *p, int32_t *s);
+const void *pcx_15bit_autofade(const void *p, int32_t *s);
+const void *pcx_15bit_backgrnd(const void *p, int32_t *s);
+const void *pcx_8bit_decomp(const void *p, int32_t *s);
+const void *hi_8bit_correct(const void *p, int32_t *s);
+const void *pcx_8bit_nopal(const void *p, int32_t *s);
+const void *set_background(const void *p, int32_t *s);
+const void *wav_load(const void *p, int32_t *s);
+const void *load_mob_legacy_format(const void *p, int32_t *s);
+const void *load_spells_legacy_format(const void *p, int32_t *s);
 void wire_main_functs(void);
 void ukaz_kompas(char mode);
 void *timming(EVENT_MSG *msg,void **data);
@@ -669,8 +670,7 @@ void objekty_mimo(void);
 void mouse_set_cursor(int cursor);
 void set_font(int font,int c1,...);
 void bott_draw(char);
-void bott_draw_proc(void **p,int32_t *s);
-THE_TIMER *add_to_timer(int id,int delay,int maxcall,void *proc);
+const void *bott_draw_proc(const void *p, int32_t *s);
 void mouse_set_default(int cursor);
 void create_frame(int x,int y,int xs,int ys,char clear);
 void save_dump(const uint16_t *screen_addr,
@@ -993,7 +993,7 @@ void calc_fly(void);
 void zmen_skupinu(THUMAN *p);
 void add_to_group(int num);
 void group_all(void);
-void build_items_called(void **p,int32_t *s);
+const void *build_items_called(const void *p, int32_t *s);
 void real_regeneration(void); //regenerace postav behem hry v realu (pouze kondice a mana)
 char sleep_regenerace(THUMAN *p);  //regenerace postav behem spani
 char check_jidlo_voda(THUMAN *p);
@@ -1666,7 +1666,7 @@ int message(int butts,char def,char canc,char *keys,...);
 void type_text(EVENT_MSG *msg,void **data); //event procedura (parms: X,Y,TEXT,MAX_SPACE,MAX_CHARS);
 void type_text_v2(va_list args);//char *text_buffer,int x,int y,int max_size,int max_chars,int font,int color,void (*exit_proc)(char));
 void zalamovani(char *source,char *target,int maxxs,int *xs,int *ys);
-void col_load(void **data,int32_t *size);
+const void *col_load(const void *data, int32_t *size);
 void open_story_file(void);
 void write_story_text(char *text);
 void close_story_file(void);
@@ -1781,5 +1781,9 @@ static __inline char TimerEvents(int sector, int side, int32_t time)
   return 1;
 }
 
+static __inline int quit_request_as_escape(int c) {
+    if (c == E_QUIT_GAME_KEY) return 0x011B;else return c;
+}
+
 //extras
 #include "extras.h"
diff --git a/game/globmap.c b/game/globmap.c
index 7b30d8e..23a283d 100644
--- a/game/globmap.c
+++ b/game/globmap.c
@@ -507,7 +507,7 @@ void global_map_point(EVENT_MSG *msg,void **_)
   if(msg->msg == E_MOUSE)
      {
      int x,y,i,xs,ys;
-     char *ptr;
+     const char *ptr;
      ms=get_mouse(msg);
      if (ms->event_type & 0x1)
         {
diff --git a/game/interfac.c b/game/interfac.c
index 1b5e035..ac65e91 100644
--- a/game/interfac.c
+++ b/game/interfac.c
@@ -429,8 +429,7 @@ void type_text_v2(va_list args)
      showview(x,y,xs,ys);
 
      EVENT_MSG *ev= task_wait_event(E_KEYBOARD); //proces bude cekat na klavesu
-     if (ev == NULL) return;
-     znak=va_arg(ev->data, int);
+     znak=ev?va_arg(ev->data, int):27;
      schovej_mysku();
      if (task_quitmsg()==1) znak=27;
      switch(znak & 0xff)
@@ -507,21 +506,22 @@ void type_text_v2(va_list args)
   }
 
 
-void col_load(void **data,int32_t *size)
+const void *col_load(const void *data, int32_t *size)
   {
   int siz=*size;
-  char *s,*c;
+  char *s;
+  const char *c;
   int palcount;
   int i;//,j,k;
 
   palcount=siz/COL_SIZE;
   *size=PIC_FADE_PAL_SIZE*palcount;
   s=getmem(*size);
-  c=*data;c+=8;
-  for(i=0;i<palcount;i++,c+=COL_SIZE)
+  c=data;c+=8;
+  for(i=0;i<palcount;i++,c+=COL_SIZE) {
      palette_shadow(c,(void *)(&s[i*PIC_FADE_PAL_SIZE]),mglob.fade_r,mglob.fade_g,mglob.fade_b);
-  free(*data);
-  *data=s;
+  }
+    return s;
   }
 
 
@@ -917,7 +917,7 @@ void check_number_1phase(char *exename) //check serial number!
 */
 static void skeldal_checkbox_draw(int x1,int y1,int x2,int y2,OBJREC *o)
   {
-  word *obr;
+  const word *obr;
   char *data;
   int phase;
   int32_t scr_linelen2 = GetScreenPitch();
@@ -1006,7 +1006,7 @@ static void setup_button_draw(int x1,int y1,int x2,int y2,OBJREC *o)
   char data;
   void **z;
   word *pic;
-  word *bb;
+  const word *bb;
   int x,y;
 
   z=(void **)o->userptr;
@@ -1088,7 +1088,7 @@ static void skeldal_soupak_draw (int x1,int y1,int x2,int y2,OBJREC *o)
   skeldal_soupak_params *z;
   int rozsah;
   int value;
-  word *pic;
+  const word *pic;
   word *back;
   int total;
   int xpos;
@@ -1120,7 +1120,7 @@ static void skeldal_soupak_event(EVENT_MSG *msg,OBJREC *o)
      skeldal_soupak_params *z;
      int rozsah;
      int total;
-     word *pic;
+     const word *pic;
      int ypos,newvalue;
 
      ms=get_mouse(msg);
diff --git a/game/inv.c b/game/inv.c
index 53e2e0d..b6caf27 100644
--- a/game/inv.c
+++ b/game/inv.c
@@ -109,7 +109,7 @@ void zkontroluj_postavu();
 
 void place_human_item(word *obrazek,int x,int y,int item)
   {
-  word *p;
+  const word *p;
 
   p=ablock(item);
   put_picture2picture(p,obrazek,PO_XSS-p[0]/2+x,PO_YS-p[1]-y-20);
@@ -143,22 +143,25 @@ void item_sound_event(int item,int sector)
   play_sample_at_sector(glob_items[item].sound+sound_handle,viewsector,sector,0,0);
   }
 
-static void items_15to16_correct(void **p,int32_t *s)
+static const void *items_15to16_correct(const void *p,int32_t *s)
   {
   int i,j;
-  char *cur=(char *)(*p);
+  void *np = getmem(*s);
+  memcpy(np, p, *s);
+  char *cur=(char *)(np);
   for (i=0;i<IT_LIB_SIZE;i++)
     {
     int pos=IT_ICONE_SIZE*i;
     word *pal;
 
-    if (pos>=*s) return;
+    if (pos>=*s) return np;
     pal=((word *)(cur+pos))+3;
     for (j=0;j<256;j++,pal++)
       {
       *pal=RGB555(*pal>>10,(*pal>>5)& 0x1F,(*pal & 0x1F));
       }
     }
+  return np;
   }
 
 void load_items()
@@ -870,7 +873,8 @@ char exit_inv(int id,int xa,int ya,int xr,int yr)
 void definuj_postavy()
   {
   int i,num1,r,inv=0,z;
-  char *c,*end,cc;
+  const char *c,*end;
+  char cc;
   int tmp;
 
   c=ablock(H_POSTAVY_DAT);
@@ -1128,7 +1132,7 @@ void display_items_in_inv(THUMAN *h)
   short *p;
 
   put_picture(266,TOP_OFS,ablock(H_IDESKA));
-  p=ablock(H_IMRIZ1);
+  p=ablock_copy(H_IMRIZ1);
   p[1]=INV_YS*((h->inv_size-1)/6)+58;
   put_picture(INV_X,INV_Y,p);
   xr=INV_X;x=0;
@@ -1176,7 +1180,8 @@ void display_rings()
 void *build_items_wearing(THUMAN *h, int32_t *s)
   {
   int i,vzhled,it;
-  word *p,hx,hy;
+  const word *p;
+  word hx,hy;
   word *ob;
   size_t siz;
   char *pp;
@@ -1224,9 +1229,9 @@ void *build_items_wearing(THUMAN *h, int32_t *s)
   }
 
 
-void build_items_called(void **p,int32_t *s)
+const void *build_items_called(const void *p, int32_t *s)
   {
-  *p=build_items_wearing(&postavy[memman_handle-H_POSTAVY], s);
+  return build_items_wearing(&postavy[memman_handle-H_POSTAVY], s);
   }
 
 void display_items_wearing(THUMAN *h)
@@ -1240,7 +1245,7 @@ void display_items_wearing(THUMAN *h)
   if (it)
         {
         TITEM *itt;
-        word *w;int vzhled;
+        const word *w;int vzhled;
 
         itt=&glob_items[it-1];
         vzhled=itt->vzhled;
@@ -1860,7 +1865,7 @@ char bag_click(int id,int xa,int ya,int xr,int yr)
 char item_pointed(int k,int x,int y,short item,short kind)
   {
   int x1,y1,x2,y2,xs,ys,xsiz,ysiz,i;
-  short *p;
+  const short *p;
   char *c,cc;
 
   if (!item) return 0;
@@ -2166,7 +2171,7 @@ void *inv_keyboard(EVENT_MSG *msg,void **usr)
   usr;
   if (msg->msg==E_KEYBOARD)
      {
-     c=va_arg(msg->data, int)>>8;
+     c=quit_request_as_escape(va_arg(msg->data, int))>>8;
      switch (c)
         {
         case 0x17:
@@ -2212,7 +2217,8 @@ void draw_fly_items(int celx,int cely,int sector,int side)
   {
   LETICI_VEC *p;
   int xpos,ypos;
-  short *pic,picnum;char turn,smr;
+  const short *pic;
+  short picnum;char turn,smr;
   TITEM *it;
   int i;
 
@@ -2692,7 +2698,7 @@ static void block_back()
 
 static void redraw_keepers_items()
   {
-        word *w;
+    const word *w;
         schovej_mysku();
         w=ablock(H_SHOP_PIC);
         display_keepers_items();
@@ -2934,7 +2940,7 @@ void enter_shop(int shopid)
 
 char shop_change_player(int id, int xa, int ya,int xr,int yr)
   {
-  word *xs;
+    const word *xs;
   int i;
 
   id;xa;ya;yr;
diff --git a/game/kniha.c b/game/kniha.c
index afe630b..f94f1a2 100644
--- a/game/kniha.c
+++ b/game/kniha.c
@@ -337,7 +337,7 @@ static int get_data_handle(char *filename,void *dec)
 static void insert_picture(char *filename,int align,int line,int lsize)
   {
   int x, y;
-  short *psiz;
+  const short *psiz;
   char *c=write_buff;
 
   psiz=ablock(get_data_handle(filename,pcx_8bit_decomp));
@@ -568,7 +568,7 @@ static char *displ_picture(char *c)
   {
   char *d;
   int x,y,hn,z,ln,sl;
-  short *sh;
+  const short *sh;
   int32_t scr_linelen2 = GetScreenPitch();
 
 
diff --git a/game/kouzla.c b/game/kouzla.c
index 061f65e..4ad98da 100644
--- a/game/kouzla.c
+++ b/game/kouzla.c
@@ -161,43 +161,45 @@ unsigned char twins;
 
 static short rand_value;
 
-static word *paleta;
+static word paleta[256];
 
-void show_full_lfb12e(void *target,void *buff,void *paleta);
+void show_full_lfb12e(void *target,const void *buff,const void *paleta);
 //#pragma aux show_full_lfb12e parm[edi][esi][ebx] modify [eax ecx]
-void show_delta_lfb12e(void *target,void *buff,void *paleta);
+void show_delta_lfb12e(void *target,const void *buff,const void *paleta);
 //#pragma aux show_delta_lfb12e parm[edi][esi][ebx] modify [eax ecx]
-char mob_check_next_sector(int sect,int dir,char alone,char passable);
+char mob_check_next_sector(int sect,int dir,const char alone,char passable);
 
 void call_spell(int i);
 int calculatePhaseDoor(int sector, int dir, int um);
 
 
-static void animace_kouzla(int act,void *data, int ssize)
+static void animace_kouzla(int act,const void *data, int ssize)
   {
   switch (act)
      {
      case MGIF_LZW:
      case MGIF_COPY:show_full_lfb12e(anim_render_buffer,data,paleta);break;
      case MGIF_DELTA:show_delta_lfb12e(anim_render_buffer,data,paleta);break;
-     case MGIF_PAL:paleta=data;*paleta|=0x8000;break;
+     case MGIF_PAL:memcpy(paleta,data,sizeof(paleta));paleta[0]|=0x8000;break;
      }
   }
 
 
-void load_spells_legacy_format(void **p, int32_t *s) {
-    TKOUZLO *k = (*p);
-    TKOUZLO *end = (TKOUZLO *)((char *)(*p) + k->start);
+const void *load_spells_legacy_format(const void *p, int32_t *s) {
+    void *np = getmem(*s);
+    memcpy(np,p,*s);
+    TKOUZLO *k = (np);
+    TKOUZLO *end = (TKOUZLO *)((char *)(np) + k->start);
     ++k;
     int count = 1;
     while (k < end) {
         ++count;
-        TKOUZLO *end2 = (TKOUZLO *)((char *)(*p) + k->start);
+        TKOUZLO *end2 = (TKOUZLO *)((char *)(np) + k->start);
         if (end2 < end) end = end2;
         ++k;
     }
     SEND_LOG("(SPELL) Loading spell table: count %d", count);
-    k = (*p);
+    k = (np);
     for (int i = 0; i < count; ++i) {
         char *b = (char *)k;
         char traceon = *(k->spellname-1);    //traceon was there;
@@ -207,6 +209,7 @@ void load_spells_legacy_format(void **p, int32_t *s) {
         k->traceon = traceon;
         ++k;
     }
+    return np;
 }
 
 
@@ -215,7 +218,7 @@ static void play_anim(va_list args) //tasked animation
   {
   int block=va_arg(args,int);
 #define ANIM_SIZE (320*180*2)
-  void *anm;
+  const void *anm;
   int32_t *l,c;
 
   if (running_anm)
diff --git a/game/menu.c b/game/menu.c
index 45196f2..9515e38 100644
--- a/game/menu.c
+++ b/game/menu.c
@@ -62,7 +62,7 @@ static char vymacknout(int id,int xa,int ya,int xr,int yr)
 
 static char promacknuti(int id,int xa,int ya,int xr,int yr)
   {
-  char *z;
+  const char *z;
   word *w;
 
   z=ablock(H_MENU_MASK);w=(word *)z;
@@ -122,18 +122,17 @@ jp1:lodsb
   }
 }*/
 
-static void nahraj_rozdilovy_pcx(void **pp,int32_t *s)
+static const void *nahraj_rozdilovy_pcx(const void *pp, int32_t *s)
   {
   char *org,*pos;
   char *vysl;
   word *size,*paltab;
   word *hicolor,*p;
-  void *origin;
+  const void *origin;
   int siz;
 
-  load_pcx((char *)*pp,*s,A_8BIT,&vysl);
+  load_pcx((char *)pp,*s,A_8BIT,&vysl);
   size=(word *)vysl;
-  free(*pp);
   siz=size[0]*size[1];
   p=hicolor=getmem(siz*2+12);
   *p++=size[0];
@@ -145,8 +144,8 @@ static void nahraj_rozdilovy_pcx(void **pp,int32_t *s)
   paltab=(word *)vysl+3;
   rozdily((uint8_t *)org,(uint8_t *)pos,hicolor+3,paltab,siz);
   free(vysl);
-  *pp=hicolor;
   *s=siz*2+12;
+  return hicolor;
   }
 
 
@@ -204,7 +203,7 @@ jp2: inc  ebx
     }
   }
 */
-static void zobraz_podle_masky_asm(char barva, uint16_t *scr, uint16_t *data, uint8_t *maska, int xs, int ys, int scr_linelen) {
+static void zobraz_podle_masky_asm(char barva, uint16_t *scr, const uint16_t *data, const uint8_t *maska, int xs, int ys, int scr_linelen) {
     int width = xs;
 
     for (int y = 0; y < ys; y++) {
@@ -221,8 +220,8 @@ static void zobraz_podle_masky_asm(char barva, uint16_t *scr, uint16_t *data, ui
 
 static void zobraz_podle_masky(char barva,char anim)
   {
-  char *maska;
-  word *data;
+  const char *maska;
+  const word *data;
   int32_t scr_linelen2 = GetScreenPitch();
   word *obr=GetScreenAdr()+300*scr_linelen2+220;
   word xs,ys;
@@ -272,11 +271,11 @@ static void prehraj_animaci_v_menu(EVENT_MSG *msg,char **unused)
   }
 
 
+#if 0
 static void preload_anim(va_list args)
   {
   int i;
 
-  low_mem=0;
   ablock(H_ANIM+29);
   for(i=0;i<30;i+=2)
      {
@@ -305,6 +304,7 @@ static void preload_anim(va_list args)
   task_wait_event(E_TIMER);
   load_ok=1;
   }
+#endif
 
 static void klavesnice(EVENT_MSG *msg,void **unused)
   {
@@ -317,7 +317,11 @@ static void klavesnice(EVENT_MSG *msg,void **unused)
      for(cursor=0;cursor<5;cursor++) if (cur_dir[cursor]==SELECT) break;
      if (cursor==5) cursor=-1;
      int c = va_arg(msg->data,int);
-     switch(c)
+     if (c ==E_QUIT_GAME_KEY) {
+         send_message(E_MENU_SELECT,4);
+         return;
+     }
+     switch(c >> 8)
         {
         case 'H':cursor--;if (cursor<0) cursor=0;break;
         case 'P':cursor++;if (cursor>4) cursor=4;break;
@@ -328,14 +332,12 @@ static void klavesnice(EVENT_MSG *msg,void **unused)
      }
   }
 
+
 int enter_menu(char open)
   {
   uint8_t c;
 
   init_menu_entries();
-  add_task(2048,preload_anim);
-  load_ok=0;
-  while(!load_ok) task_sleep();
   if (!open)
     {
     change_music(get_next_music_from_playlist());
@@ -353,7 +355,7 @@ int enter_menu(char open)
   ms_last_event.event_type=0x1;
   send_message(E_MOUSE,&ms_last_event);
   EVENT_MSG *ev = task_wait_event(E_MENU_SELECT);
-  c=va_arg(ev->data, int);
+  c=ev?va_arg(ev->data, int):-1;
   disable_click_map();
   send_message(E_DONE,E_KEYBOARD,klavesnice);
   cur_dir[c]=UNSELECT;
@@ -516,7 +518,7 @@ void titles(va_list args)
   char send_back=va_arg(args,int);
   char *textname=va_arg(args,char *);
 
-  void *picture;
+  const void *picture;
   word *scr,*buff;
   int counter,newc;
   int lcounter=1;
diff --git a/game/realgame.c b/game/realgame.c
index 236d6d5..c00ee72 100644
--- a/game/realgame.c
+++ b/game/realgame.c
@@ -125,45 +125,7 @@ void prepare_graphics(int *ofs,char *names,int32_t size,void *decomp,int class)
      }
   }
 
-static void preload_percent(int cur,int max)
-  {
-  int pos;
-  pos=cur*640/max;
-  if (pos>640) pos=640;
-  curcolor=RGB555(16,16,16);hor_line32(0,476,pos);
-  curcolor=RGB555(8,8,8);hor_line32(0,477,pos);
-  curcolor=RGB555(31,31,31);hor_line32(0,475,pos);
-  showview(0,460,640,20);
-  do_events();
-  }
 
-void preload_objects(int ofsts)
-//#pragma preload_objects parm [];
-  {
-  int i;
-  char lodka=1;
-
-  for(i=1;i<mapsize;i++) if (map_sectors[i].sector_type==S_LODKA) break;
-  if (i==mapsize) lodka=0;
-//  const char *c = build_pathname(2, pathname[SR_DATA], "LOADING.MUS");
-//  change_music(c);
-  trans_bar(0,460,640,20,0);
-  position(0,460);
-  set_font(H_FBOLD,RGB555(0,31,0));
-  const char *c = concat2(texty[TX_LOAD], mglob.mapname);
-  outtext(c);
-  for(i=0;i<ofsts;i++)
-     {
-     if (i<H_LODKA0 || i>H_LODKA7 || lodka) apreload_sign(i,ofsts);
-     }
-  apreload_start(preload_percent);
-/*  for(i=0;i<ofsts;i++)
-     {
-     ablock(ofsts-i-1);
-     preload_percent(i+ofsts,ofsts);
-     }
-  */
-  }
 
 int load_level_texts(const char *filename)
   {
@@ -194,21 +156,6 @@ char *change_extension_support(char *buffer, const char *filename,char *new_exte
 
 #define set_file_extension(filename, extension) change_extension_support((char *)alloca(strlen(filename)+strlen(extension)), (filename), (extension))
 
-void show_loading_picture(char *filename)
-  {
-  void *p;
-  int32_t s;
-
-  p=afile(filename,SR_BGRAFIKA,&s);
-  put_picture(0,0,p);
-  showview(0,0,0,0);
-  free(p);
-  #ifdef LOGFILE
-  display_ver(639,0,2,0);
-  #endif
-  cancel_pass=1;
-  }
-
 extern int snd_devnum;
 
 int load_map(char *filename)
@@ -228,8 +175,6 @@ int load_map(char *filename)
   const char *mpath = build_pathname(2, gpathtable[SR_MAP], filename);
   mpath = local_strdup(mpath);
   schovej_mysku();
-  if (level_preload) show_loading_picture("LOADING.HI");
-  change_music("?");
   zobraz_mysku();
   f=fopen_icase(mpath,"rb");
   if (level_fname!=NULL) free(level_fname);
@@ -317,7 +262,7 @@ int load_map(char *filename)
                   SEND_LOG("(GAME) Loading enemies...");
                   if (mob_template==NULL)
                     {
-                    int32_t h;char *p;
+                    int32_t h;const char *p;
 
                     alock(H_ENEMY);
                     p=ablock(H_ENEMY);
@@ -370,7 +315,6 @@ int load_map(char *filename)
   fclose(f);
   flag_map=(char *)getmem(mapsize*4);
   memset(minimap,0,sizeof(minimap));
-  if (level_preload) preload_objects(ofsts);
   end_ptr=ofsts;
   const char *tpath=set_file_extension(mpath,".txt");
   suc=load_level_texts(tpath);
@@ -1866,16 +1810,16 @@ void sleep_players(va_list args)
 
 void *game_keyboard(EVENT_MSG *msg,void **usr)
   {
-  uint8_t c;
+  int c;
 
   usr;
   if (pass_zavora) return NULL;
   if (cur_mode==MD_END_GAME) return NULL;
   if (msg->msg==E_KEYBOARD)
      {
-      c=va_arg(msg->data, int)>>8;
+      c=quit_request_as_escape(va_arg(msg->data, int));
      while (_bios_keybrd(_KEYBRD_READY) ) _bios_keybrd(_KEYBRD_READ);
-     switch (c)
+     switch (c >> 8)
         {
         case 'H':step_zoom(0);break;
         case 'P':step_zoom(2);break;
diff --git a/game/setup.c b/game/setup.c
index 2c8d269..5a6658e 100644
--- a/game/setup.c
+++ b/game/setup.c
@@ -83,7 +83,7 @@ static void setup_keyboard(EVENT_MSG *msg,void **_)
   {
   if (msg->msg == E_KEYBOARD)
      {
-      char c= va_arg(msg->data, int);
+      char c= quit_request_as_escape(va_arg(msg->data, int));
      if (c==27)
         {
         unwire_proc();
diff --git a/game/skeldal.c b/game/skeldal.c
index f8a30d3..b33f35a 100644
--- a/game/skeldal.c
+++ b/game/skeldal.c
@@ -91,11 +91,11 @@ static int init_music_vol=127;
 static int init_gfx_vol=255;
 static char titles_on=0;
 
-void pcx_fade_decomp(void **p,int32_t *s);
-void pcx_15bit_decomp(void **p,int32_t *s);
-void pcx_15bit_autofade(void **p,int32_t *s);
-void pcx_15bit_backgrnd(void **p,int32_t *s);
-void pcx_8bit_decomp(void **p,int32_t *s);
+const void *pcx_fade_decomp(const void *p, int32_t *s);
+const void *pcx_15bit_decomp(const void *p, int32_t *s);
+const void *pcx_15bit_autofade(const void *p, int32_t *s);
+const void *pcx_15bit_backgrnd(const void *p, int32_t *s);
+const void *pcx_8bit_decomp(const void *p, int32_t *s);
 
 char *texty_knihy;
 static char *patch_file=NULL;
@@ -280,82 +280,80 @@ void purge_temps(char _) {
     temp_storage_clear();
 }
 
-void pcx_fade_decomp(void **p,int32_t *s)
+const void *pcx_fade_decomp(const void *p, int32_t *s)
   {
   char *buff;
-  int r = load_pcx(*p,*s,A_FADE_PAL,&buff,mglob.fade_r,mglob.fade_g,mglob.fade_b);
+  int r = load_pcx(p,*s,A_FADE_PAL,&buff,mglob.fade_r,mglob.fade_g,mglob.fade_b);
   assert(r > 0);
   *s=r;
-  free(*p);
-  *p=buff;
+  return buff;
   }
 
-void pcx_15bit_decomp(void **p,int32_t *s)
+const void *pcx_15bit_decomp(const void *p, int32_t *s)
   {
   char *buff;
-  int r = load_pcx(*p,*s,A_16BIT,&buff);
+  int r = load_pcx(p,*s,A_16BIT,&buff);
   assert(r > 0);
   *s=r;
-  free(*p);
-  *p=buff;
+  return buff;
   }
 
-void pcx_15bit_autofade(void **p,int32_t *s)
+const void *pcx_15bit_autofade(const void *p, int32_t *s)
   {
   char *buff;
-  int r = load_pcx(*p,*s,A_16BIT,&buff);
+  int r = load_pcx(p,*s,A_16BIT,&buff);
   assert(r > 0);
   *s=r;
-  free(*p);
-  *p=buff;
   buff[5]=0x80;
+  return buff;
   }
 
-void pcx_15bit_backgrnd(void **p,int32_t *s)
+const void *pcx_15bit_backgrnd(const void *p, int32_t *s)
   {
   char *buff;
   int32_t i;int32_t *z;
 
-  if (*p!=NULL)
+  if (p!=NULL)
      {
-     int r = load_pcx(*p,*s,A_16BIT,&buff);
+     int r = load_pcx(p,*s,A_16BIT,&buff);
      assert(r>0);
      z=(int32_t *)buff;
      *s=r;
      for(i=*s;i>0;i-=4,z++) *z|=0x80008000;
-     free(*p);
-     *p=buff;
+     return buff;
      }
+  return NULL;
   }
 
-void pcx_8bit_nopal(void **p,int32_t *s)
+const void *pcx_8bit_nopal(const void *p,int32_t *s)
   {
-  char *buff;
+  char *buff = NULL;
 
-  if (*p!=NULL)
+  if (p!=NULL)
      {
-     int r = load_pcx(*p,*s,A_8BIT_NOPAL,&buff);
+     int r = load_pcx(p,*s,A_8BIT_NOPAL,&buff);
      assert(r>0);
      *s=r;
-     free(*p);
-     *p=buff;
      }
+  return buff;
   }
 
 
-void pcx_8bit_decomp(void **p,int32_t *s)
+
+const void *pcx_8bit_decomp(const void *p, int32_t *s)
   {
   char *buff;
-  int r = load_pcx(*p,*s,A_8BIT,&buff);
+  int r = load_pcx(p,*s,A_8BIT,&buff);
   assert(r>0);
   *s=r;
-  free(*p);
-  *p=buff;
+  return buff;
   }
 
-void hi_8bit_correct(void **p,int32_t *s)
+const void *hi_8bit_correct(const void *p,int32_t *s)
 {
-  word *ptr=(word *)*p;
+    word *out = (word *)getmem(*s);
+    memcpy(out, p, *s);
+  word *ptr=out;
   int i;
   if (ptr[2]==8)
   {
@@ -364,13 +362,14 @@ void hi_8bit_correct(void **p,int32_t *s)
 	  ptr[i+3]=((ptr[i+3] & ~0x1F)+ptr[i+3]);
 	}
   }
+  return out;
 }
 
 
-void load_mob_legacy_format(void **p, int32_t *s) {
+const void *load_mob_legacy_format(const void *p, int32_t *s) {
     const int sz = 376;
     int count = *s / sz;;
-    char *c = *p;
+    const char *c = p;
     TMOB *out = getmem(count * sizeof(TMOB));
 
     memset(out, 0 , sizeof(TMOB)*count);
@@ -393,33 +392,34 @@ void load_mob_legacy_format(void **p, int32_t *s) {
         memcpy(d, c, nx - ofs); //last padding 1
         c+=nx - ofs - 1;
     }
-    free(*p);
-    *p =out;
     *s = count * sizeof(TMOB);
+    return out;
 }
 
 
-void set_background(void **p,int32_t *s)
+const void *set_background(const void *p, int32_t *s)
   {
-  word *data;
+  const word *data;
   word *ptr;
-  word *pal;
+  const word *pal;
   char *pic;
+  void *out;
   int counter;
 
 
-  if (!bgr_handle) return;
-  if (bgr_distance==-1) return;
+  if (!bgr_handle) return p;
+  if (bgr_distance==-1) return p;
   int32_t scr_linelen2 = GetScreenPitch();
   data=ablock(bgr_handle);
   *s=scr_linelen2*360*2;
-  ptr=*p=getmem(*s);
+  out = ptr=getmem(*s);
   counter=scr_linelen2*360;
   pal=data+3+bgr_distance*256;
   pic=(char *)data+PIC_FADE_PAL_SIZE;
   do
 	*ptr++=pal[(uint8_t)*pic++] | BGSWITCHBIT;
   while (--counter);
+  return out;
   }
 
 void mouse_set_cursor(int cursor)
@@ -1268,6 +1268,7 @@ void play_anim(int anim_num)
      char *t,*z;
      TSTR_LIST titl=NULL;
      const char *s = build_pathname(2,gpathtable[SR_VIDEO], texty[anim_num]);
+     s = local_strdup(s);
      if (snd_devnum==DEV_NOSOUND || titles_on)
       {
       concat(t,s,"   ");
@@ -1433,7 +1434,7 @@ static void load_saved_game(void)
   update_mysky();
   {
       EVENT_MSG *msg = task_wait_event(E_CLOSE_MAP);
-      game = va_arg(msg->data, int);
+      game = msg?va_arg(msg->data, int):-1;
   }
   unwire_proc();
   disable_click_map();
@@ -1485,6 +1486,7 @@ static void start(va_list args)
      volba=enter_menu(openning);openning=1;
      switch (volba)
        {
+       default:
        case V_KONEC:exit_wait=1;break;
        case V_NOVA_HRA: if (!enter_generator())
                           {
@@ -1594,6 +1596,10 @@ void show_help_short() {
     printf("add -h to print help\n");
 }
 
+void quit_cb_exit_wait(void *) {
+    exit_wait = 1;
+}
+
 int main(int argc,char *argv[])
   {
   def_mman_group_table(gpathtable);
@@ -1638,9 +1644,12 @@ int main(int argc,char *argv[])
 
   init_skeldal(cfg);
 
-  add_task(65536,start);
+  int start_task = add_task(65536,start);
 
   escape();
+
+  term_task_wait(start_task);
+
   closemode();
 
   ini_close(cfg);
diff --git a/game/sndandmus.c b/game/sndandmus.c
index 5f9144e..a15e29b 100644
--- a/game/sndandmus.c
+++ b/game/sndandmus.c
@@ -196,17 +196,17 @@ int calcul_volume(int chan,int x,int y,int side,int volume)
   return 0;
   }
 
-void wav_load(void **p,int32_t *s)
+const void *wav_load(const void *p, int32_t *s)
   {
-  char *sr;
+  const char *sr;
   char *tg;
   void *tgr;
   struct t_wave x[3];
 
-  sr=*p;
+  sr=p;
   sr=find_chunk(sr,WAV_FMT);
   read_chunk(sr,&x);
-  sr=*p;
+  sr=p;
   sr=find_chunk(sr,WAV_DATA);
   *s=get_chunk_size(sr);
   tgr=tg=getmem(*s+sizeof(struct t_wave)+4);
@@ -215,31 +215,9 @@ void wav_load(void **p,int32_t *s)
   *(int *)tg=*s;
   tg+=4;
   read_chunk(sr,tg);
-  free(*p);
-  *p=tgr;
+
   *s+=sizeof(struct t_wave)+4;
-/*  if (x[0].freq!=x[0].bps)
-     {
-     char s;
-
-     siz>>=1;
-     s=siz & 1;
-     siz>>=1;
-     d=tg;
-     for(;siz--;d++) *d^=0x80008000;
-     if (s) {c=(char *)d;c[1]^=0x80;}
-     }
-  else
-     {
-     char s;
-
-     s=siz & 3;
-     siz>>=2;
-     d=(int32_t *)tg;
-     for(;siz--;d++) *d^=0x80808080;
-     c=(char *)d;
-     for(;s--;c++) *c^=0x80;
-     }*/
+  return tgr;
   }
 
 void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p)
@@ -247,7 +225,7 @@ void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p
   int chan;
   int blockid;
   SND_INFO *track;
-  char *s;
+  const char *s;
 
   if (!sound_enabled) return;
   side;
@@ -273,8 +251,6 @@ void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p
     if (blockid == -1) {
         def_handle(end_ptr, p->filename, wav_load, SR_ZVUKY);
         blockid = end_ptr++;
-        if (level_preload)
-            apreload(blockid);
     }
 
       alock(blockid);
@@ -414,7 +390,7 @@ void purge_playlist()
 void play_sample_at_sector(int sample,int sector1,int sector2,int track, char loop)
   {
   int x,y,xd,yd,chan;
-  char *s;
+  const char *s;
   struct t_wave *p;
   int siz;
 	int oldtrack;
@@ -450,7 +426,7 @@ void play_sample_at_sector(int sample,int sector1,int sector2,int track, char lo
 
 void play_sample_at_channel(int sample,int channel,int vol)
   {
-  char *s;
+  const char *s;
   struct t_wave *p;
   int siz;
 
@@ -486,7 +462,7 @@ void create_sound_table(char *template,int32_t size)
 
 void create_sound_table_old()
   {
-  char *c,*s;
+  const char *c,*s;
   int32_t pocet;
   int i=0;
 
@@ -547,8 +523,8 @@ static int flute_canal=30;
 
 void start_play_flute(char note)
   {
-  void *q;
-  char *w;
+  const void *q;
+  const char *w;
   float realfrq;
   int vol=50;
 
@@ -569,8 +545,8 @@ void start_play_flute(char note)
 
 void stop_play_flute()
   {
-  void *q;
-  char *w;
+  const void *q;
+  const char *w;
 
   if (check_snd_effect(SND_GFX))
      {
diff --git a/game/souboje.c b/game/souboje.c
index 1480d6f..bf31f3a 100644
--- a/game/souboje.c
+++ b/game/souboje.c
@@ -1415,7 +1415,7 @@ char ask_who_proc(int id,int xa,int ya,int xr,int yr)
   {
   THUMAN *p;
   int i;
-  word *xs;
+  const word *xs;
 
   xs=ablock(H_OKNO);
   i=xr/xs[0];yr;xa;ya;id;
@@ -1492,7 +1492,7 @@ char runes_mask(int id,int xa,int ya,int xr,int yr)
   {
   char *c;
   int cc;
-  short *d;
+  const short *d;
 
   id;ya;xa;
   d=ablock(H_RUNEMASK);
@@ -1927,7 +1927,7 @@ void programming_keyboard(EVENT_MSG *msg,void **unused)
   unused;
   if (msg->msg==E_KEYBOARD)
      {
-     c=va_arg(msg->data, int)>>8;
+     c=quit_request_as_escape(va_arg(msg->data, int))>>8;
      while (_bios_keybrd(_KEYBRD_READY) ) _bios_keybrd(_KEYBRD_READ);
      switch (c)
         {
diff --git a/libs/basicobj.c b/libs/basicobj.c
index 9de93e1..26e398b 100644
--- a/libs/basicobj.c
+++ b/libs/basicobj.c
@@ -198,7 +198,7 @@ void button2(OBJREC *o)
 
 void draw_status_line(char *c)
   {
-  static word *font;
+  static const word *font;
   static FC_TABLE color;
   static word backgr;
   static word ysmax=0,y;
diff --git a/libs/bgraph.c b/libs/bgraph.c
index 616755a..97b06c1 100644
--- a/libs/bgraph.c
+++ b/libs/bgraph.c
@@ -12,14 +12,15 @@ word *lbuffer;
 word *screen;
 word curcolor,charcolors[7] = {0x0000,0x03E0,0x0380,0x0300,0x0280,0x0000,0x0000};
 longint linelen;
-word *curfont,*writepos,writeposx;
+const word *curfont;
+word *writepos,writeposx;
 byte fontdsize=0;
 byte *palmem,*xlatmem;
 void (*showview)(word,word,word,word);
 char line480=0;
 int32_t screen_buffer_size=512000;
 
-void *mscursor,*mssavebuffer=NULL;
+const void *mscursor,*mssavebuffer=NULL;
 integer mscuroldx=0,mscuroldy=0;
 integer msshowx=0,msshowy=0;
 int32_t pictlen; // Tato promenna je pouze pouzita v BGRAPH1.ASM
@@ -194,7 +195,7 @@ void hide_ms_cursor()
   put_picture(mscuroldx,mscuroldy,mssavebuffer);
   }
 
-void *register_ms_cursor(void *cursor)
+void *register_ms_cursor(const void *cursor)
   {
   integer xs,ys;
 
diff --git a/libs/bgraph.h b/libs/bgraph.h
index a1b512a..3a9a09e 100644
--- a/libs/bgraph.h
+++ b/libs/bgraph.h
@@ -15,7 +15,8 @@ void RedirectScreenBufferSecond(void);
 
 
 extern word curcolor,charcolors[7];
-extern word *curfont,*writepos,writeposx;
+extern const word *curfont;
+extern word *writepos,writeposx;
 extern byte fontdsize;
 extern void (*showview)(word,word,word,word);
 extern char __skip_change_line_test;
@@ -42,13 +43,13 @@ void ver_line_xor(int x1,int y1,int y2);
 //#pragma aux ver_line_xor parm [eSi] [eAX] [eCX] modify [eDX];
 void line_32(int x,int y,int xs,int ys);
 //#pragma aux line_32 parm [esi] [eax] [ecx] [ebx] modify [edx edi]
-void char_32(word *posit,word *font,char znak);
+void char_32(word *posit,const word *font,char znak);
 //#pragma aux char_32 parm [edi] [esi] [eax] modify [eax ebx ecx edx]
-void char2_32(word *posit,word *font,char znak);
+void char2_32(word *posit,const word *font,char znak);
 //#pragma aux char2_32 parm [edi] [esi] [eax] modify [eax ebx ecx edx]
-word charsize(word *font,char znak);
+word charsize(const word *font,char znak);
 //#pragma aux charsize parm [esi] [eax]
-void put_picture(word x,word y,void *p);
+void put_picture(word x,word y,const void *p);
 //#pragma aux put_picture parm [esi] [eax] [edi] modify [ebx ecx edx]
 void get_picture(word x,word y,word xs,word ys,void *p);
 //#pragma aux get_picture parm [esi] [eax] [ebx] [ecx] [edi] modify [edx]
@@ -108,22 +109,22 @@ void closemode(void);
 void line32(word x1,word y1, word x2, word y2);
 void position(word x,word y);
 void show_ms_cursor(integer x,integer y);
-void *register_ms_cursor(void *cursor);
+void *register_ms_cursor(const void *cursor);
 void move_ms_cursor(integer newx,integer newy,char nodraw);
 void hide_ms_cursor(void);
 void redraw_ms_cursor_on_screen(void);
-int text_height(char *text);
-int text_width(char *text);
-void set_aligned_position(int x,int y,char alignx, char aligny,char *text);
+int text_height(  const char *text);
+int text_width(  const char *text);
+void set_aligned_position(int x,int y,char alignx, char aligny,const char *text);
 void rectangle(int x1,int y1,int x2,int y2,int color);
 word *mapvesaadr1(word *a);
 void rel_position_x(word x);
 
-void put_8bit_clipped(void *src,void *trg,int startline,int velx,int vely);
+void put_8bit_clipped(const void *src,void *trg,int startline,int velx,int vely);
 //#pragma aux put_8bit_clipped parm [ESI][EDI][EAX][EBX][EDX] modify [ECX];
-void put_textured_bar_(void *src,void *trg,int xsiz,int ysiz,int xofs,int yofs);
+void put_textured_bar_(const void *src,void *trg,int xsiz,int ysiz,int xofs,int yofs);
 //#pragma aux put_textured_bar_ parm [EBX][EDI][EDX][ECX][ESI][EAX];
-void put_textured_bar(void *src,int x,int y,int xs,int ys,int xofs,int yofs);
+void put_textured_bar(const void *src,int x,int y,int xs,int ys,int xofs,int yofs);
 void trans_bar(int x,int y,int xs,int ys,int barva);
 //#pragma aux trans_bar parm [EDI][ESI][EDX][ECX][EBX] modify [EAX];
 void trans_bar25(int x,int y,int xs,int ys);
@@ -132,11 +133,11 @@ void trans_line_x(int x,int y,int xs,int barva);
 //#pragma aux trans_line_x parm [EDI][ESI][ECX][EDX] modify [EAX];
 void trans_line_y(int x,int y,int ys,int barva);
 //#pragma aux trans_line_y parm [EDI][ESI][ECX][EDX] modify [EAX];
-void draw_placed_texture(short *txtr,int celx,int cely,int posx,int posy,int posz,char turn);
+void draw_placed_texture(const short *txtr,int celx,int cely,int posx,int posy,int posz,char turn);
 
-void put_image(word *image,word *target,int start_line,int sizex,int sizey);
+void put_image(const word *image,word *target,int start_line,int sizex,int sizey);
 //#pragma aux put_image parm [ESI][EDI][EAX][EBX][EDX] modify [ECX]
-void put_picture2picture(word *source,word *target,int xp,int yp);
+void put_picture2picture(const word *source,word *target,int xp,int yp);
 //#pragma aux put_picture2picture parm [ESI][EDI][EAX][EDX] modify [ECX]
 
 
diff --git a/libs/bgraph2.c b/libs/bgraph2.c
index 6275601..eb0d662 100644
--- a/libs/bgraph2.c
+++ b/libs/bgraph2.c
@@ -8,7 +8,8 @@
 
 word *screen;
 word curcolor,charcolors[7] = {0x0000,RGB555(0,31,0),RGB555(0,28,0),RGB555(0,24,0),RGB555(0,20,0),0x0000,0x0000};
-word *curfont,*writepos,writeposx;
+const word *curfont;
+word *writepos,writeposx;
 byte fontdsize=0;
 void (*showview)(word,word,word,word);
 char line480=0;
@@ -17,7 +18,8 @@ char screenstate=0;
 char __skip_change_line_test=0;
 char no_restore_mode=0;
 
-void *mscursor,*mssavebuffer=NULL;
+const void *mscursor;
+void *mssavebuffer=NULL;
 integer mscuroldx=0,mscuroldy=0;
 integer mscuroldxs=1,mscuroldys=1;
 char write_window=0;
@@ -501,7 +503,7 @@ void redraw_ms_cursor_on_screen(void) {
 }
 
 
-void *register_ms_cursor(void *cursor)
+void *register_ms_cursor(const void *cursor)
   {
   integer xs,ys;
 
@@ -544,7 +546,7 @@ void move_ms_cursor(integer newx,integer newy,char nodraw)
   mscuroldys=ys;
   }
 
-int text_height(char *text)
+int text_height(const char *text)
   {
   char max=0,cur;
 
@@ -553,7 +555,7 @@ int text_height(char *text)
   return max<<fontdsize;
   }
 
-int text_width(char *text)
+int text_width(const char *text)
   {
   int suma=0;
 
@@ -563,7 +565,7 @@ int text_width(char *text)
   }
 
 
-void set_aligned_position(int x,int y,char alignx,char aligny,char *text)
+void set_aligned_position(int x,int y,char alignx,char aligny,const char *text)
   {
   switch (alignx)
      {
diff --git a/libs/bgraph2a.c b/libs/bgraph2a.c
index 8f96ec1..b12680f 100644
--- a/libs/bgraph2a.c
+++ b/libs/bgraph2a.c
@@ -121,7 +121,7 @@ void line_32(int x,int y,int xs,int ys)
   }
 
 
-void char_32(word *posit,word *font,char znak)
+void char_32(word *posit,const word *font,char znak)
 //#pragma aux char_32 parm [edi] [esi] [eax] modify [eax ebx ecx edx]
   {
     int32_t scr_linelen2 = GetScreenPitch();
@@ -213,7 +213,7 @@ chrend:                 ;konec
     }
 */
   }
-void char2_32(word *posit,word *font,char znak)
+void char2_32(word *posit, const word *font,char znak)
 //#pragma aux char2_32 parm [edi] [esi] [eax] modify [eax ebx ecx edx]
   {
 
@@ -275,7 +275,7 @@ chr2end:              ;konec
 */
   }
 
-word charsize(word *font,char znak)
+word charsize(const word *font,char znak)
   {
 
 	  unsigned char *esi = (unsigned char *)font;
@@ -308,12 +308,12 @@ chsend: and     eax,0ffffh
     }*/
   }
 
-void put_picture(word x,word y,void *p)
+void put_picture(word x,word y,const void *p)
 //#pragma aux put_picture parm [esi] [eax] [edi] modify [ebx ecx edx]
   {
   int32_t scr_linelen2 = GetScreenPitch();
   word *adr=GetScreenAdr()+scr_linelen2*y+x;
-  word *data=p;
+  const word *data=p;
   word xs=data[0];
   word ys=data[1];
   word mode=data[2];
@@ -354,7 +354,7 @@ void put_picture(word x,word y,void *p)
     }
   if (mode==8 || mode==264)
     {
-    word *table=data;
+    const word *table=data;
     uint8_t *cdata=(uint8_t *)(data+(mode==264?10*256:256));
     int i;
     int j;
@@ -369,7 +369,7 @@ void put_picture(word x,word y,void *p)
     }
   else if (mode==512 )
     {
-    word *table=data;
+    const word *table=data;
     uint8_t *cdata=(uint8_t *)(data+256);
     int i;
     int j;
@@ -412,11 +412,11 @@ void get_picture(word x,word y,word xs,word ys,void *p)
     }
   }
 
-void put_image(word *image,word *target,int start_line,int sizex,int sizey)
+void put_image(const word *image,word *target,int start_line,int sizex,int sizey)
 //#pragma aux put_image parm [ESI][EDI][EAX][EBX][EDX] modify [ECX]
   {
     int32_t scr_linelen2 = GetScreenPitch();
-	word *esi = image;
+	const word *esi = image;
 	word *edi = target;
 	int edx = sizey;
 	int ecx = esi[0];
@@ -464,15 +464,15 @@ puti_lp:mov     ecx,ebx
     }*/
   }
 
-void put_8bit_clipped(void *src,void *trg,int startline,int velx,int vely)
+void put_8bit_clipped(const void *src,void *trg,int startline,int velx,int vely)
 //#pragma aux put_8bit_clipped parm [ESI][EDI][EAX][EBX][EDX] modify [ECX];
   {
     int32_t scr_linelen2 = GetScreenPitch();
 	  if (src==NULL) return;
 	  {
-		  word *esi = src;
+		  const word *esi = src;
 		  word *edi = trg;
-		  word *paleta = esi+3;
+		  const word *paleta = esi+3;
 		  int cx = esi[0];
 		  unsigned char *imgdata = (unsigned char *)(esi + 3 + 256)+ startline * cx;
 
@@ -536,7 +536,7 @@ put8_trns:
 ende:
     }*/
 
-void put_textured_bar_(void *src,void *trg,int xsiz,int ysiz,int xofs,int yofs)
+void put_textured_bar_(const void *src,void *trg,int xsiz,int ysiz,int xofs,int yofs)
 //#pragma aux put_textured_bar_ parm [EBX][EDI][EDX][ECX][ESI][EAX];
   {
 
@@ -711,7 +711,7 @@ void wait_retrace()
 
 #define pic_start (2+2+2+512*5+512*5)
 
-void put_picture2picture(word *source,word *target,int xp,int yp)
+void put_picture2picture(const word *source,word *target,int xp,int yp)
 //#pragma aux put_picture2picture parm [ESI][EDI][EAX][EDX] modify [ECX]
   {
 
diff --git a/libs/devices.c b/libs/devices.c
index 1479c81..61f5110 100644
--- a/libs/devices.c
+++ b/libs/devices.c
@@ -89,6 +89,9 @@ void keyboard(EVENT_MSG *msg, void *user_data) {
     user_data;
     if (msg->msg == E_WATCH) {
         *otevri_zavoru = 1;
+        if (game_display_is_quit_requested()) {
+            send_message(E_KEYBOARD, E_QUIT_GAME_KEY);
+        }
         if (!_bios_keybrd(_KEYBRD_READY))
             return;
         i = _bios_keybrd(_KEYBRD_READ);
diff --git a/libs/event.c b/libs/event.c
index 5290ef7..b9760c0 100644
--- a/libs/event.c
+++ b/libs/event.c
@@ -464,15 +464,12 @@ void except_GPF()
   }
 
 */
+
 void init_events()
   {
   send_message(E_ADD,E_WATCH,keyboard);
   send_message(E_ADD,E_WATCH,timer);
   send_message(E_ADD,E_WATCH,tasker);
-#ifdef nodebug
-  alloc_exception(0xD,except_GPF);
-  alloc_exception(0xE,except_GPF);
-#endif
   }
 
 static char do_events_called=0;
diff --git a/libs/event.h b/libs/event.h
index 5efedad..6e81144 100644
--- a/libs/event.h
+++ b/libs/event.h
@@ -32,6 +32,9 @@
 #define E_MOUSE 11
 #define E_TIMER 12
 
+
+#define E_QUIT_GAME_KEY ((int)0xFFFF)
+
 #define TASK_RUNNING 0
 #define TASK_TERMINATING 1
 
diff --git a/libs/gui.c b/libs/gui.c
index e1d17c9..2db3d70 100644
--- a/libs/gui.c
+++ b/libs/gui.c
@@ -25,7 +25,7 @@ FC_TABLE f_default;
 word desktop_y_size;
 char force_redraw_desktop=0;
 static char change_flag=0,f_cancel_event=0;
-word *default_font;
+const word *default_font;
 void empty()
   {
   }
@@ -382,7 +382,7 @@ CTL3D *border(word light,word shadow, word bsize, word btype)
   return &p;
   }
 
-void property(CTL3D *ctl,word *font,FC_TABLE *fcolor,word color)
+void property(CTL3D *ctl,const word *font,FC_TABLE *fcolor,word color)
   {
   if (ctl!=NULL) memcpy(&o_end->border3d,ctl,sizeof(CTL3D));
   if (font!=NULL) o_end->font=font;
diff --git a/libs/gui.h b/libs/gui.h
index d76d07e..e3b7c58 100644
--- a/libs/gui.h
+++ b/libs/gui.h
@@ -69,7 +69,7 @@ typedef struct objrec
   int32_t datasize;
   void *data;
   FC_TABLE f_color;
-  word *font;
+  const word *font;
   void *userptr;
   void (*call_init)(struct objrec *, va_list);
   void (*call_draw)(int , int, int, int, struct objrec *);
@@ -122,7 +122,7 @@ extern CTL3D noneborder;
 extern FC_TABLE f_default;
 extern word desktop_y_size;
 //extern char change_flag;
-extern word *default_font;
+extern const word *default_font;
 extern void *gui_background;
 
 
@@ -137,7 +137,7 @@ void redraw_object(OBJREC *o);
 void redraw_window(void);
 void define(int id,int x,int y,int xs,int ys,char align,void (*initproc)(OBJREC *),...);
 CTL3D *border(word light,word shadow, word bsize, word btype);
-void property(CTL3D *ctl,word *font,FC_TABLE *fcolor,word color);
+void property(CTL3D *ctl,const word *font,FC_TABLE *fcolor,word color);
 FC_TABLE *flat_color(word color);
 void aktivate_window(MS_EVENT *ms);
 void redraw_desktop(void);
diff --git a/libs/memman.c b/libs/memman.c
index 567240b..f3e46e5 100644
--- a/libs/memman.c
+++ b/libs/memman.c
@@ -21,7 +21,7 @@ void bonz_table();
 
 #define NON_GETMEM_RESERVED (4*1024)
 static const char **  mman_pathlist=NULL;
-static char swap_status=0;
+
 
 static FILE *swap = NULL;
 char mman_patch=0;
@@ -121,133 +121,97 @@ typedef struct tnametable
         int32_t seek;
         }TNAMETABLE;
 
+typedef struct tnametable_ref {
+    const TNAMETABLE *data;
+    uint32_t count;
+} TNAMETABLE_REF;
 
 static int32_t *grptable,grptabsiz;
-static TNAMETABLE *nametable;
-static int nmtab_size;
+static TNAMETABLE_REF bmf_nametable;
+static TNAMETABLE_REF patch_nametable;
 static int next_name_read=0;
 static int last_group;
 
 char *main_file_name=NULL;
 handle_groups _handles;
-static FILE *bmf=NULL;
-static FILE *patch=NULL;
+//static FILE *bmf=NULL;
+//static FILE *patch=NULL;
+static void *bmf_m = NULL;
+static size_t bmf_s = 0;
+static void *patch_m = NULL;
+static size_t patch_s = 0;
 uint32_t bk_global_counter=0;
 char *swap_path;
 
-#ifdef LOGFILE
-void bonz_table()
-  {
-  int i;
-  if (bmf==NULL) return;
-  for(i=0;i<nmtab_size;i++)
-    {
-    fprintf(stderr,"%-12.12s %12d\n",nametable[i].name,nametable[i].seek);
-    }
-  }
-#endif
 
 static int test_file_exist_DOS(int group,char *filename)
   {
-     char *f;
-
-     f=alloca(strlen(mman_pathlist[group])+strlen(filename)+1);
-     strcpy(f,mman_pathlist[group]);
-     strcat(f,filename);
+     const char *f = build_pathname(2, mman_pathlist[group], filename);
      if (!check_file_exists(f)) return 0;
      return 1;
   }
 
 
+
+
 void load_grp_table()
   {
   int32_t i = 0;;
 
   SEND_LOG("(LOAD) Loading Group Table");
-  fseek(bmf,4,SEEK_SET);
-  fread(&i,4,1,bmf);
+  const uint32_t *src_table = (const uint32_t *)bmf_m;
+                   //fseek(bmf,4,SEEK_SET);
+  i = src_table[1];//fread(&i,4,1,bmf);
   grptable=(int32_t *)getmem(i+4);
-  fseek(bmf,0,SEEK_SET);
-  fread(grptable,i,1,bmf);
+                  //fseek(bmf,0,SEEK_SET);
+  grptabsiz = src_table[0];
+                 //fread(grptable,i,1,bmf);
   grptabsiz=i;
   for(i=0;i<(grptabsiz>>3);i++) grptable[i*2+1]=(grptable[i*2+1]-grptabsiz)>>4;
   SEND_LOG("(LOAD) Group Table Loaded");
   }
 
-void load_file_table()
-  {
-  int strsize;
-  void *p;
 
-  SEND_LOG("(LOAD) Loading File Table");
-  fseek(bmf,grptabsiz,SEEK_SET);
-  fseek(bmf,12,SEEK_CUR);
-  fread(&strsize,4,1,bmf);
-  strsize-=grptabsiz;
-  fseek(bmf,grptabsiz,SEEK_SET);
-  p=getmem(strsize);
-  nametable = p;
-  fread(nametable,1,strsize,bmf);
-  nmtab_size=strsize/sizeof(*nametable);
-  SEND_LOG("(LOAD) File Table Loaded");
+static TNAMETABLE_REF load_file_table(const void *bmf_m)
+  {
+  const uint32_t *src_table = (const uint32_t *)bmf_m;
+  uint32_t grptabsiz = src_table[1];
+  TNAMETABLE_REF out;
+  out.data = (const TNAMETABLE *)((const char *)bmf_m + grptabsiz);
+  out.count = (out.data[0].seek - grptabsiz)/sizeof(TNAMETABLE);
+  return out;
   }
 
 
-
-int find_name(int group,char *name)
-  {
-  int i;
-
-  for(i=0;i<(grptabsiz>>2);i+=2)
-     {
-     if (grptable[i]==group) break;
-     }
-  if ((grptabsiz>>2)<=i) return -1;
-  for(i=grptable[i+1];i<nmtab_size;i++)
-     if (!strncmp(nametable[i].name,name,12)) break;
-  if (i==nmtab_size) return -1;
-  return i;
+int get_file_entry_in_table(const TNAMETABLE_REF *where, char *name) {
+  for(uint32_t i = 0; i< where->count; ++i) {
+      if (strncmp(where->data[i].name, name, 12) == 0) {
+          return where->data[i].seek;
+      }
   }
+  return -1;
+
+}
+
+
 
 int get_file_entry(int group,char *name)
   {
-  int i;
   char ex;
 
-  if (mman_patch) ex=test_file_exist_DOS(group,name);else ex=0;
-  if (ex || bmf==0) return 0;
-  i=find_name(group,name);
-  if (i==-1) return 0;
-  return nametable[i].seek;
+  ex=test_file_exist_DOS(group,name);
+  if (ex || bmf_m==0) return 0;
+  if (patch_m) {
+      int sk = get_file_entry_in_table(&patch_nametable, name);
+      if (sk >= 0) return -sk;
+  }
+  if (bmf_m) {
+      int sk = get_file_entry_in_table(&bmf_nametable, name);
+      if (sk >= 0) return sk;
+  }
+  return 0;
   }
-int swap_block(THANDLE_DATA *h)
-  {
-  int32_t wsize,pos;
 
-  if (mman_action!=NULL) mman_action(MMA_SWAP);
-  if (!swap) return -1;
-  if (h->flags & BK_HSWAP) pos=h->seekpos; else pos=swap_add_block(h->size);
-  fseek(swap,0,SEEK_END);
-  wsize=ftell(swap);
-  fseek(swap,pos,SEEK_SET);
-  SEND_LOG("(SWAP) Swaping block '%-.12s'",h->src_file);
-  wsize=fwrite(h->blockdata,1,h->size,swap);
-  swap_status=1;
-  if ((unsigned)wsize==h->size)
-     {
-     h->seekpos=pos;
-     if (h->flags & BK_PRELOAD) h->flags&=~BK_SWAPABLE;
-     h->flags|=BK_HSWAP;
-     return 0;
-     }
-  else
-     {
-     SEND_LOG("(SWAP) Swap failed!");
-     swap_error();
-     }
-  swap_free_block(pos,h->size);
-  return -1;
-  }
 
 THANDLE_DATA *get_handle(int handle)
   {
@@ -264,80 +228,16 @@ THANDLE_DATA *get_handle(int handle)
   return ((THANDLE_DATA *)_handles[group])+list;
   }
 
-void heap_error(size_t size) //heap system
-  {
-  int i,j;
-  uint32_t maxcounter=0;
-  THANDLE_DATA *sh;
-  char repeat=0,did=0;
-  THANDLE_DATA *lastblock=NULL;
-  char *last_free=NULL;
-  do
-  {
-  maxcounter=0;
-  sh=NULL;
-  repeat=0;did=0;
-  for(i=0;i<BK_MAJOR_HANDLES;i++)
-       if (_handles[i]!=NULL)
-         {
-         uint32_t c,max=0xffffffff,d;
-         for (j=0;j<BK_MINOR_HANDLES;j++)
-           {
-           THANDLE_DATA *h;
 
-           h=((THANDLE_DATA *)_handles[i]+j);
-           c=bk_global_counter-h->counter;
-           if (h->status==BK_PRESENT && ~h->flags & BK_LOCKED) {
-              if (last_free!=NULL)
-                 {
-                 d=(char *)h->blockdata-last_free;
-                 if (d<max) sh=h,max=d,did=1;
-                 }
-              else if (c>maxcounter)
-                 {
-                 maxcounter=c;
-                 sh=h;
-                 did=1;
-                 }
-           }
-           }
-         }
-  if (lastblock==sh)
-     {
-     did=0;repeat=0;
-     }
-  if (did)
-     {
-     size-=sh->size;
-     last_free=sh->blockdata;
-     if (sh->flags & BK_SWAPABLE)
-        {
-        if (swap_block(sh))  //pri neuspechu o ulozeni je nalezen blok jiny
-           {
-           sh->counter=bk_global_counter;
-           repeat=1;
-           }
-        else
-           {
-           free(sh->blockdata);
-           sh->status=BK_SWAPED;
-           }
-        }
-     else
-        {
-        if (sh->flags & BK_PRELOAD) sh->status=BK_SWAPED;
-        else sh->status=BK_NOT_LOADED;
-        free(sh->blockdata);
-        if (mman_action!=NULL) mman_action(MMA_FREE);
-        }
-     }
-  else
-     standard_mem_error(size);
-  lastblock=sh;
-  }
-  while (repeat || size>0);
-//  if (swaped) _dos_commit(swap);
-  }
+static char need_to_be_free(const void *ptr) {
+    const char *beg = (const char *)bmf_m;
+    const char *p = (const char *)ptr;
+    if (p >= beg && p < beg+bmf_s) return 0;
+    beg = (const char *)patch_m;
+    if (p >= beg && p < beg+bmf_s) return 0;
+    return 1;
+}
+
 
 THANDLE_DATA *kill_block(int handle)
   {
@@ -351,7 +251,9 @@ THANDLE_DATA *kill_block(int handle)
      }
   SEND_LOG("(KILL) Killing block '%-.12s' (%04X)",h->src_file,handle);
   if (h->status==BK_SAME_AS) return h;
-  if (h->status==BK_PRESENT) free(h->blockdata);
+  if (h->status==BK_PRESENT) {
+      ablock_free(h->blockdata);
+  }
   if (h->flags & BK_HSWAP) swap_free_block(h->seekpos,h->size);
   h->status=BK_NOT_LOADED;
   h->flags&=~BK_HSWAP;
@@ -369,6 +271,11 @@ THANDLE_DATA *zneplatnit_block(int handle)
   return h;
   }
 
+static void heap_error() {
+    display_error("out of memory");
+    abort();
+}
+
 void init_manager(const char *filename,const char *swap_is_not_supported) // filename= Jmeno datoveho souboru nebo NULL pak
                                   // se pouzije DOS
                                             // swp je cesta do TEMP adresare
@@ -378,13 +285,12 @@ void init_manager(const char *filename,const char *swap_is_not_supported) // fil
   memset(_handles,0,sizeof(_handles));
   if (filename!=NULL)
      {
-     bmf=fopen_icase(filename,"rb");
-     if (bmf)
+     bmf_m = map_file_to_memory(file_icase_find(filename), &bmf_s);
+     if (bmf_m)
         {
         main_file_name=(char *)getmem(strlen(filename)+1);
         strcpy(main_file_name,filename);
-        load_grp_table();
-        load_file_table();
+        bmf_nametable = load_file_table(bmf_m);
         }
      else
         main_file_name=NULL;
@@ -433,11 +339,11 @@ int find_handle(const char *name,void *decomp)
 
 int test_file_exist(int group,char *filename)
   {
-  if (find_name(group,filename)==-1) return test_file_exist_DOS(group,filename);
+  if (get_file_entry(group,filename)==0) return test_file_exist_DOS(group,filename);
   return 1;
   }
 
-THANDLE_DATA *def_handle(int handle,const char *filename,void *decompress,char path)
+THANDLE_DATA *def_handle(int handle,const char *filename,ABLOCK_DECODEPROC decompress,char path)
   {
   THANDLE_DATA *h;
   int i;
@@ -473,7 +379,7 @@ THANDLE_DATA *def_handle(int handle,const char *filename,void *decompress,char p
 
 void *afile(char *filename,int group,int32_t *blocksize)
   {
-  char *c,*d;
+  char *d;
   int32_t entr;
   void *p;
 
@@ -484,27 +390,41 @@ void *afile(char *filename,int group,int32_t *blocksize)
   else entr=get_file_entry(group,d);
   if (entr!=0)
      {
-		 FILE *hnd;
+		 const void *hnd;
 		 SEND_LOG("(LOAD) Afile is loading file '%s' from group %d",d,group);
-		 if (entr<0) entr=-entr,hnd=patch;else hnd=bmf;
-     fseek(hnd,entr,SEEK_SET);
-     fread(blocksize,1,4,hnd);
-     p=getmem(*blocksize);
-     fread(p,1,*blocksize,hnd);
+		 if (entr<0) entr=-entr,hnd=patch_m;else hnd=bmf_m;
+		 const int32_t * szptr = (const int32_t *)hnd;
+		 *blocksize = *szptr;
+		 void *ret = getmem(*blocksize);
+		 memcpy(ret, szptr+1, *blocksize);
+		 return ret;
      }
   else if (mman_pathlist!=NULL)
      {
+      const char *name = build_pathname(2,mman_pathlist[group],d);
+
      SEND_LOG("(LOAD) Afile is loading file '%s' from disk (group %d)",d,group);
-     c=alloca(strlen(filename)+strlen(mman_pathlist[group])+2);
-     c=strcat(strcpy(c,mman_pathlist[group]),filename);
-     p=load_file(c);
+     p=load_file(name);
      *blocksize=last_load_size;
      }
   else return NULL;
   return p;
   }
 
-void *ablock(int handle)
+
+static void decompress_data(THANDLE_DATA *h) {
+    if (h->loadproc) {
+        int32_t sz = h->size;
+        const void *r = h->loadproc(h->blockdata, &sz);
+        if (r != h->blockdata) {
+            ablock_free(h->blockdata);
+            h->blockdata = r;
+            h->size = sz;
+        }
+    }
+}
+
+const void *ablock(int handle)
   {
   THANDLE_DATA *h;
 
@@ -517,10 +437,11 @@ void *ablock(int handle)
      handle=h->seekpos;
      goto sem;
      }
-  if (h->status==BK_PRESENT) return h->blockdata;
-  if (h->status==BK_DIRLIST)
+  if (h->status==BK_PRESENT) {
+      return h->blockdata;
+  } if (h->status==BK_DIRLIST)
      {
-     free(h->blockdata);h->status=BK_NOT_LOADED;
+     ablock_free(h->blockdata);h->status=BK_NOT_LOADED;
      }
   if (h->status==BK_NOT_LOADED)
      {
@@ -541,27 +462,26 @@ void *ablock(int handle)
               p=NULL;
               s=0;
               }
-           if (h->loadproc!=NULL) h->loadproc(&p,&s);
            h->blockdata=p;
            h->status=BK_PRESENT;
            h->size=s;
-           return p;
+           decompress_data(h);
+           return h->blockdata;
            }
         else
            {
-					 int entr=h->seekpos;
-					 FILE *hnd;
+           int entr=h->seekpos;
+           const void *hnd;
            if (mman_action!=NULL) mman_action(MMA_READ);
-					 if (entr<0) entr=-entr,hnd=patch;else hnd=bmf;
-           fseek(hnd,entr,SEEK_SET);
-           fread(&s,1,4,hnd);
-           p=getmem(s);
-           fread(p,1,s,hnd);
-           if (h->loadproc!=NULL) h->loadproc(&p,&s);
+           if (entr<0) entr=-entr,hnd=patch_m;else hnd=bmf_m;
+           const int32_t *szptr =(const int32_t *)((const char *)hnd+entr);
+           s = *szptr;
+           void *p = (void *)(szptr+1);
            h->blockdata=p;
            h->status=BK_PRESENT;
            h->size=s;
-           return p;
+           decompress_data(h);
+           return h->blockdata;
            }
         }
      //tato cast programu bude jeste dodelana - else ....
@@ -572,6 +492,16 @@ void *ablock(int handle)
   return NULL;
   }
 
+void *ablock_copy(int handle) {
+    const void *ptr = ablock(handle);
+    if (need_to_be_free(ptr)) return (void *)ptr;
+    THANDLE_DATA *h = get_handle(handle);
+    void *cpy = getmem(h->size);
+    memcpy(cpy, ptr, h->size);
+    h->blockdata = cpy;
+    return cpy;
+}
+
 void alock(int handle)
   {
   THANDLE_DATA *h;
@@ -651,43 +581,6 @@ void apreload_sign(int handle,int max_handle)
      if (!(h->flags & BK_PRELOAD) || !(h->flags & BK_HSWAP)) apr_sign[handle]=h->seekpos;
   }
 
-int apreload_sort(const void *val1,const void *val2)
-  {
-  int32_t vl1,vl2;
-
-  vl1=apr_sign[*(word *)val1];
-  vl2=apr_sign[*(word *)val2];
-  return (vl1>vl2)-(vl1<vl2);
-  }
-
-void apreload_start(void (*percent)(int cur,int max))
-  {
-  short *p;
-  int i;
-  int c,z;
-
-  swap_status=0;
-  p=NewArr(short,max_sign);
-  for(i=0;i<max_sign;i++) p[i]=i;
-  qsort(p,max_sign,sizeof(word),apreload_sort);
-  for(i=0,c=0;i<max_sign;i++) if (apr_sign[p[i]]==0x7f7f7f7f)p[i]=-1;else c++;
-  for(i=0,z=0;i<max_sign;i++) if (p[i]!=-1)
-     {
-     apreload(p[i]);
-     percent(z++,swap_status?c+max_sign*2:c);
-     }
-  if (swap_status)
-     for(i=0;i<max_sign;i++)
-        {
-        THANDLE_DATA *h=get_handle(p[i]);
-        if (h->status==BK_PRESENT) swap_block(h);
-        percent(c+i,c+max_sign);
-        }
-//  _dos_commit(swap);
-  free(apr_sign);
-  free(p);
-  apr_sign=NULL;
-  }
 
 void undef_handle(int handle)
   {
@@ -715,11 +608,10 @@ void close_manager()
      free(_handles[i]);
      }
   free(main_file_name);
-  if (bmf) fclose(bmf);
-  if (patch) fclose(patch);
+  if (bmf_m) unmap_file(bmf_m, bmf_s);
+  if (patch_m) unmap_file(patch_m, patch_s);
   if (swap) fclose(swap);
-  free(grptable); grptable=NULL;
-  free(nametable); nametable=NULL;
+
   max_handle=0;
   }
 
@@ -814,13 +706,6 @@ void *grealloc(void *p,int32_t size)
   return q;
   }
 
-char *read_next_entry(char mode)
-  {
-  if (mode==MMR_FIRST) next_name_read=0;
-  if (main_file_name==NULL) return NULL;
-  if (next_name_read>=nmtab_size) return NULL;
-  return nametable[next_name_read++].name;
-  }
 
 int read_group(int index)
   {
@@ -829,34 +714,13 @@ int read_group(int index)
 
 char add_patch_file(char *filename)
 	{
-	int32_t l;
-	int32_t poc;
-	int i,cc=0;
-	TNAMETABLE p;
 	SEND_LOG("Adding patch: %s",filename);
-	if (!patch) return 2;
-	if (!bmf) return 3;
-	patch=fopen_icase(filename,"rb");
-	if (!patch) return 1;
-	fseek(patch,4,SEEK_SET);
-	fread(&l,1,4,patch);
-	fseek(patch,l,SEEK_SET);
-	fread(&p,1,sizeof(p),patch);
-	poc=(p.seek-l)/sizeof(p);
-	fseek(patch,l,SEEK_SET);
-	for(i=0;i<poc;i++)
-		{
-		int j;
-		fread(&p,1,sizeof(p),patch);
-		j=find_name(read_group(0),p.name);
-		if (j==-1)
-			{
-			nametable=grealloc(nametable,sizeof(TNAMETABLE)*(nmtab_size+1));
-			j=nmtab_size++;strncpy(nametable[j].name,p.name,12);
-			}
-		nametable[j].seek=-p.seek,cc++;
-		}
-	SEND_LOG("Patch added: %s - %d entries modified",filename,cc);
+	if (!patch_m) return 2;
+	if (!bmf_m) return 3;
+    patch_m = map_file_to_memory(file_icase_find(filename), &bmf_s);
+	if (!patch_m) return 1;
+	patch_nametable = load_file_table(patch_m);
+	SEND_LOG("Patch added: %s - %u entries modified",filename,patch_nametable.count);
 	return 0;
 	}
 
@@ -943,3 +807,7 @@ FILE *afiletemp(char *filename, int group)
   fseek(f,0,SEEK_SET);
   return f;
   }
+
+void ablock_free(const void *ptr) {
+    if (need_to_be_free(ptr)) free((void *)ptr);
+}
diff --git a/libs/memman.h b/libs/memman.h
index 923866f..689e703 100644
--- a/libs/memman.h
+++ b/libs/memman.h
@@ -12,6 +12,14 @@
 extern "C" {
 #endif
 
+///decodes block if needed
+/**
+ * @param src source data
+ * @param size source size - you need to write own size if data has been converted
+ * @param pointer either to src or newly allocated block with replacement (must be allocated by malloc)
+ */
+typedef const void *(*ABLOCK_DECODEPROC)(const void *src, int32_t *size);
+
 
 #define freemem(size) free(size);
 //#define malloc(size) getmem(size)
@@ -36,11 +44,11 @@ typedef struct thandle_data
   {
   char src_file[12];  //12
   int32_t seekpos;       //16
-  void *blockdata;    //20
+  const void *blockdata;    //20
   char flags;        //21
   uint8_t path;        //22
   short status;
-  void (*loadproc)(void **data,int32_t *size);//28
+  ABLOCK_DECODEPROC loadproc;
   unsigned short lockcount;               //32
   uint32_t counter;
   uint32_t size;
@@ -66,6 +74,7 @@ typedef handle_list *handle_groups[BK_MAJOR_HANDLES];
 #define BK_SHARED 4
 #define BK_PRELOAD 8
 #define BK_HSWAP 16
+#define BK_READONLY 32
 
 //extern  char *const * mman_pathlist;  //tento pointer musi byt naplnen ukazatelem na tabulku cest
 extern int memman_handle; //cislo handle naposled zpracovavaneho prikazem ablock
@@ -75,13 +84,13 @@ void *grealloc(void *m,int32_t size); //realokace pameti pres memman
 void *load_file(const char *filename); //obycejne natahne soubor do pameti a vrati ukazatel.
 void init_manager(const char *filename,const char *swp); //inicializuje manager. Jmeno filename i swapname nejsou povinne (musi byt NULL kdyz nejsou pouzity)
 void def_mman_group_table(const char ** ); //define pointer to table of paths, for each group there is path
-THANDLE_DATA *def_handle(int handle,const char *filename,void *decompress,char path); //deklaruje rukojet. promenna decompress je ukazatel na funkci ktera upravi data pred vracenim ukazatele
-void *ablock(int handle);             //vraci ukazatel bloku spojeneho s handlem
+THANDLE_DATA *def_handle(int handle,const char *filename,ABLOCK_DECODEPROC decompress,char path); //deklaruje rukojet. promenna decompress je ukazatel na funkci ktera upravi data pred vracenim ukazatele
+const void *ablock(int handle);             //vraci ukazatel bloku spojeneho s handlem
+void *ablock_copy(int handle);             //vraci ukazatel bloku spojeneho s handlem
 void alock(int handle);               //zamyka blok
 void aunlock(int handle);             //odmyka blok
 void aswap(int handle);               //zapina swapovani pro blok
 void aunswap(int handle);             //vypina swapovani pro blok
-void apreload(int handle);            //zapina preloading pro blok (preloading proved pomoci ablock)
 //void free(void);                          //free
 void close_manager(void);                 //uzavre manager a uvolni veskerou pamet
 void undef_handle(int handle);        //uvolni hadle k dalsimu pouziti
@@ -92,11 +101,9 @@ int test_file_exist(int group,char *filename); //testuje zda soubor existuje v r
 void *afile(char *filename,int group,int32_t *blocksize); //nahraje do pameti soubor registrovany v ramci mmanageru
 int32_t get_handle_size(int handle);
 //void get_mem_info(MEMORYSTATUS *mem);
+void ablock_free(const void *ptr);
 
-void apreload_sign(int handle,int max_handle);     //pripravi preloading pro nacteni dat z CD (sekvencne)
-void apreload_start(void (*percent)(int cur,int max));   //provede sekvenci apreload
 
-char *read_next_entry(char mode);     //cte adresar DDL souboru a vraci jmeno, nebo NULL. mode udava, zda se hleda od zacatku, nebo pokracuje tam kde program skoncil
 int read_group(int index);
 char add_patch_file(char *filename);  //pripojuje zaplatu
 FILE *afiletemp(char *filename, int group);
diff --git a/libs/mgifmapmem.c b/libs/mgifmapmem.c
index 499c485..bba6080 100644
--- a/libs/mgifmapmem.c
+++ b/libs/mgifmapmem.c
@@ -123,7 +123,7 @@ static void StretchImageHQ(word *src, word *trg, int32_t linelen, char full)
 
 
 
-static void PlayMGFFile(void *file, MGIF_PROC proc,int ypos,char full)
+static void PlayMGFFile(const void *file, MGIF_PROC proc,int ypos,char full)
   {
   int32_t scr_linelen2 = GetScreenPitch();
   mgif_install_proc(proc);
@@ -144,7 +144,9 @@ static void PlayMGFFile(void *file, MGIF_PROC proc,int ypos,char full)
       file=mgif_play(file);
       StretchImageHQ(picture, GetScreenAdr()+ypos*scr_linelen2, scr_linelen2,full);
       showview(0,ypos,0,360);
-      if (_bios_keybrd(_KEYBRD_READY)==0) {
+      if (game_display_is_quit_requested()) {
+          break;
+      } else if (_bios_keybrd(_KEYBRD_READY)==0) {
           mix_back_sound(0);
       }
       else
@@ -159,13 +161,13 @@ static void PlayMGFFile(void *file, MGIF_PROC proc,int ypos,char full)
   }
 
 
-void show_full_lfb12e(void *target,void *buff,void *paleta);
-void show_delta_lfb12e(void *target,void *buff,void *paleta);
+void show_full_lfb12e(void *target,const void *buff,const void *paleta);
+void show_delta_lfb12e(void *target,const void *buff,const void *paleta);
 void show_delta_lfb12e_dx(void *target,void *buff,void *paleta);
 void show_full_lfb12e_dx(void *target,void *buff,void *paleta);
 
 
-word * load_mgf_palette(word *pal) {
+word * load_mgf_palette(const word *pal) {
     static word paleta[256];
     for (int i = 0; i < 256; ++i) {
         paleta[i] = pal[i]+(pal[i]&0x7fe0);
@@ -173,7 +175,7 @@ word * load_mgf_palette(word *pal) {
     return paleta;
 }
 
-void BigPlayProc(int act,void *data,int csize)
+void BigPlayProc(int act,const void *data,int csize)
   {
   switch (act)
      {
@@ -189,7 +191,7 @@ void BigPlayProc(int act,void *data,int csize)
 void play_animation(const char *filename,char mode,int posy,char sound)
   {
   size_t sz;
-  void *mgf=map_file_to_memory(filename, &sz);
+  void *mgf=map_file_to_memory(file_icase_find(filename), &sz);
   change_music(NULL);
   if (mgf==NULL) return;
   PlayMGFFile(mgf,BigPlayProc,posy,mode & 0x80);
diff --git a/libs/mgifmem.c b/libs/mgifmem.c
index 84bd6d2..8cdc82d 100644
--- a/libs/mgifmem.c
+++ b/libs/mgifmem.c
@@ -74,9 +74,9 @@ void mgif_install_proc(MGIF_PROC proc)
   show_proc=proc;
   }
 
-struct mgif_header load_mgif_header(char **mgif) {
+struct mgif_header load_mgif_header(const char **mgif) {
     struct mgif_header r;
-    char *iter = *mgif;
+    const char *iter = *mgif;
     memcpy(r.sign, iter, 4); iter+=4;
     memcpy(r.year, iter, 2); iter+=2;
     r.eof = *iter++;
@@ -90,9 +90,9 @@ struct mgif_header load_mgif_header(char **mgif) {
     return r;
 }
 
-void *open_mgif(void *mgif) //vraci ukazatel na prvni frame
+const void *open_mgif(const void *mgif) //vraci ukazatel na prvni frame
   {
-  char *c = mgif;
+  const char *c = mgif;
   struct mgif_header mgh = load_mgif_header(&c);
 
   if (strncmp(mgh.sign,MGIF,4)) return NULL;
@@ -111,9 +111,9 @@ void close_mgif(void)           //dealokuje buffery pro prehravani
   }
 
 
-int input_code(void *source,int32_t *bitepos,int bitsize,int mask)
+int input_code(const void *source,int32_t *bitepos,int bitsize,int mask)
   {
-      uint8_t *esi = source;            //    mov esi,source
+      const uint8_t *esi = source;            //    mov esi,source
       int32_t *edi = bitepos;           //    mov edi,bitepos
       int ebx = bitsize;                //    mov ebx,bitsize
       int edx = mask;                   //    mov edx,mask
@@ -276,7 +276,7 @@ end:
     */
   }
 
-void lzw_decode(void *source,char *target)
+void lzw_decode(const void *source,char *target)
   {
   int32_t bitpos=0;
   int code;
@@ -332,7 +332,7 @@ typedef struct chunk_header_t {
     uint8_t type;
 } CHUNK_HEADER_T;
 
-CHUNK_HEADER_T read_chunk_header(char **iter) {
+CHUNK_HEADER_T read_chunk_header(const char **iter) {
     CHUNK_HEADER_T ret;
     ret.type = *(uint8_t *)(*iter)++;
     ret.size = *(uint8_t *)(*iter)++;
@@ -341,7 +341,7 @@ CHUNK_HEADER_T read_chunk_header(char **iter) {
     return ret;
 }
 
-FRAME_HEADER_T read_frame_header(char **iter) {
+FRAME_HEADER_T read_frame_header(const char **iter) {
     FRAME_HEADER_T ret;
     ret.count = *(uint8_t *)(*iter)++;
     ret.size = *(uint8_t *)(*iter)++;
@@ -350,11 +350,13 @@ FRAME_HEADER_T read_frame_header(char **iter) {
     return ret;
 }
 
-void *mgif_play(void *mgif) //dekoduje a zobrazi frame
+const void *mgif_play(const void *mgif) //dekoduje a zobrazi frame
   {
-  char *pf,*pc,*ff;
+  const char *pf;
+  const char *pc;
+  char *ff;
 //  int acts,size,act,csize;
-  void *scr_sav;
+  const void *scr_sav;
   int scr_act=-1;
 
 
diff --git a/libs/mgifmem.h b/libs/mgifmem.h
index 8699871..0f3b5dd 100644
--- a/libs/mgifmem.h
+++ b/libs/mgifmem.h
@@ -1,7 +1,7 @@
 //!!!! POZOR, NUTNE LINKOVAT SOUBOR LZWA.ASM
 #ifndef _MGIFMEM_H
 
-typedef void (*MGIF_PROC)(int,void *,int csize); //prvni cislo akce, druhy data akce
+typedef void (*MGIF_PROC)(int,const void *,int csize); //prvni cislo akce, druhy data akce
 
 #define _MGIFMEM_H
 #define MGIF "MGIF"
@@ -34,7 +34,7 @@ typedef struct mgif_header
 
 
 void mgif_install_proc(MGIF_PROC proc);
-void *open_mgif(void *mgif); //vraci ukazatel na prvni frame
-void *mgif_play(void *mgif); //dekoduje a zobrazi frame
+const void *open_mgif(const void *mgif); //vraci ukazatel na prvni frame
+const void *mgif_play(const void *mgif); //dekoduje a zobrazi frame
 void close_mgif(void);           //dealokuje buffery pro prehravani
 #endif
diff --git a/libs/mgifplaya.c b/libs/mgifplaya.c
index 78a9efa..7d41dbd 100644
--- a/libs/mgifplaya.c
+++ b/libs/mgifplaya.c
@@ -5,7 +5,7 @@
 
 #include <assert.h>
 
-void show_full_lfb12e(void *target, void *buff, void *paleta) {
+void show_full_lfb12e(void *target,const void *buff, const void *paleta) {
     uint16_t *edi = (uint16_t *)target;
     uint8_t *esi = (uint8_t *)buff;
     uint16_t *ebx = (uint16_t *)paleta;
diff --git a/libs/pcx.c b/libs/pcx.c
index c1822ad..b0d6dc6 100644
--- a/libs/pcx.c
+++ b/libs/pcx.c
@@ -13,9 +13,9 @@
 void *get_palette_ptr=NULL;
 
 
-void decomprimate_line_256(char *src,char *trg,int linelen,int *srcstep)
+void decomprimate_line_256(const char *src,char *trg,int linelen,int *srcstep)
   {
-  char *srcsave;
+  const char *srcsave;
 
   srcsave=src;
   while (linelen--)
@@ -31,9 +31,9 @@ void decomprimate_line_256(char *src,char *trg,int linelen,int *srcstep)
      }
   *srcstep=src-srcsave;
   }
-void decomprimate_line_hi(char *src,unsigned short *trg,unsigned short *paleta,int linelen,int *srcstep)
+void decomprimate_line_hi(const char *src,unsigned short *trg,unsigned short *paleta,int linelen,int *srcstep)
   {
-  char *srcsave;
+  const char *srcsave;
 
   srcsave=src;
   while (linelen--)
@@ -52,10 +52,10 @@ void decomprimate_line_hi(char *src,unsigned short *trg,unsigned short *paleta,i
   *srcstep=src-srcsave;
   }
 
-void palette_shadow(char *pal1,unsigned short pal2[][256],int tr,int tg,int tb)
+void palette_shadow(const char *pal1,unsigned short pal2[][256],int tr,int tg,int tb)
   {
   int i,j;
-  char *bt;
+  const char *bt;
   int r,g,b;
   short hi;
 
@@ -90,14 +90,15 @@ void palette_shadow(char *pal1,unsigned short pal2[][256],int tr,int tg,int tb)
   }
 
 
-int load_pcx(char *pcx,int32_t fsize,int conv_type,char **buffer, ... )
+int load_pcx(const char *pcx,int32_t fsize,int conv_type,char **buffer, ... )
   //dale nasleduji int hodnoty poctu prechodu a R,G,B barvy
   {
   unsigned short paleta2[256];
-  char *paleta1;
-  char *ptr1;
+  const char *paleta1;
+  const char *ptr1;
+  char *ptr4;
   unsigned short *ptr2;
-  char *ptr3;
+  const char *ptr3;
   int i;
   PCXHEADER pcxdata;
   int xsize,ysize;
@@ -129,20 +130,20 @@ int load_pcx(char *pcx,int32_t fsize,int conv_type,char **buffer, ... )
      case A_NORMAL_PAL: *buffer=(char *)getmem(sz = xsize*ysize+16+768);break;
      default: return -2; //invalid type specificied
      }
-  ptr1=*buffer;
-  *(unsigned short *)ptr1++=xsize;ptr1++;
-  *(unsigned short *)ptr1++=ysize;ptr1++;
-  *(unsigned short *)ptr1++=conv_type;ptr1++;
+  ptr4=*buffer;
+  *(unsigned short *)ptr4++=xsize;ptr4++;
+  *(unsigned short *)ptr4++=ysize;ptr4++;
+  *(unsigned short *)ptr4++=conv_type;ptr4++;
   pcx+=sizeof(pcxdata);ptr3=pcx;
   if (conv_type==A_NORMAL_PAL)
      {
-     memcpy(ptr1,paleta1,768);
-     ptr1+=768;
+     memcpy(ptr4,paleta1,768);
+     ptr4+=768;
      }
   if (conv_type==A_8BIT)
      {
-     memcpy(ptr1,paleta2,512);
-     ptr1+=512;
+     memcpy(ptr4,paleta2,512);
+     ptr4+=512;
      }
   if (conv_type==A_FADE_PAL)
      {
@@ -154,8 +155,8 @@ int load_pcx(char *pcx,int32_t fsize,int conv_type,char **buffer, ... )
      tg=va_arg(lst,int);
      tb=va_arg(lst,int);
      va_end(lst);
-     palette_shadow(paleta1,(unsigned short (*)[256])ptr1,tr,tg,tb);
-     ptr1+=SHADE_PAL;
+     palette_shadow(paleta1,(unsigned short (*)[256])ptr4,tr,tg,tb);
+     ptr4+=SHADE_PAL;
      }
   ysize++;
   while (--ysize)
@@ -163,13 +164,13 @@ int load_pcx(char *pcx,int32_t fsize,int conv_type,char **buffer, ... )
      int step;
      if (conv_type==A_16BIT)
         {
-        decomprimate_line_hi(ptr3,(unsigned short *)ptr1,paleta2,pcxdata.bytesperline,&step);
-        ptr1+=2*xsize;
+        decomprimate_line_hi(ptr3,(unsigned short *)ptr4,paleta2,pcxdata.bytesperline,&step);
+        ptr4+=2*xsize;
         }
      else
         {
-        decomprimate_line_256(ptr3,ptr1,pcxdata.bytesperline,&step);
-        ptr1+=xsize;
+        decomprimate_line_256(ptr3,ptr4,pcxdata.bytesperline,&step);
+        ptr4+=xsize;
         }
      ptr3+=step;
      }
diff --git a/libs/pcx.h b/libs/pcx.h
index 5776b67..9341197 100644
--- a/libs/pcx.h
+++ b/libs/pcx.h
@@ -31,9 +31,9 @@ extern "C" {
 
 
 //returns <0 error, >0 allocated size
-int load_pcx(char *pcx,int32_t fsize,int conv_type,char **buffer, ... );
+int load_pcx(const char *pcx,int32_t fsize,int conv_type,char **buffer, ... );
 int open_pcx(const char *filename,int type,char **buffer,...);
-void palette_shadow(char *pal1,unsigned short pal2[][256],int tr,int tg,int tb);
+void palette_shadow(const char *pal1,unsigned short pal2[][256],int tr,int tg,int tb);
 extern void *get_palette_ptr;
 
 #ifdef __cplusplus
diff --git a/libs/wav_mem.c b/libs/wav_mem.c
index 5c606f8..81513f9 100644
--- a/libs/wav_mem.c
+++ b/libs/wav_mem.c
@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include "wav_mem.h"
 
-char *find_chunk(char *wav,char *name)
+const char *find_chunk(const char *wav,char *name) //TODO improve
   {
   int32_t next;
 
@@ -18,7 +18,7 @@ char *find_chunk(char *wav,char *name)
   while (1);
   }
 
-int get_chunk_size(char *wav)
+int get_chunk_size(const char *wav)
   {
   int32_t size;
 
@@ -26,7 +26,7 @@ int get_chunk_size(char *wav)
   return(size);
   }
 
-int read_chunk(char *wav,void *mem)
+int read_chunk(const char *wav,void *mem)
   {
 
   wav+=4;
diff --git a/libs/wav_mem.h b/libs/wav_mem.h
index 5263949..7652734 100644
--- a/libs/wav_mem.h
+++ b/libs/wav_mem.h
@@ -12,9 +12,9 @@ typedef struct t_wave
   int32_t freq,bps;
   }T_WAVE;
 
-char *find_chunk(char *wav,char *name);
-int get_chunk_size(char *wav);
-int read_chunk(char *wav,void *mem);
+const char *find_chunk(const char *wav,char *name);
+int get_chunk_size(const char *wav);
+int read_chunk(const char *wav,void *mem);
 
 
 #endif
diff --git a/libs/zvuk.h b/libs/zvuk.h
index d5b5f83..a136066 100644
--- a/libs/zvuk.h
+++ b/libs/zvuk.h
@@ -25,7 +25,7 @@ int sound_detect(int *dev,int *port,int *dma, int *irq);
 void set_mixing_device(int mix_dev,int mix_freq,...);
 char start_mixing(void);
 void stop_mixing(void);
-void play_sample(int channel,void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type);
+void play_sample(int channel,const void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type);
 void set_channel_volume(int channel,int left,int right);
 void set_end_of_song_callback(const char * (*cb)(void *), void *ctx);
 
@@ -43,14 +43,14 @@ char get_channel_state(int channel);
 void get_channel_volume(int channel,int *left,int *right);
 void mute_channel(int channel);
 void chan_break_loop(int channel);
-void chan_break_ext(int channel,void *org_sample,int32_t size_sample); //zrusi loop s moznosti dohrat zvuk
+void chan_break_ext(int channel,const void *org_sample,int32_t size_sample); //zrusi loop s moznosti dohrat zvuk
 
 char set_snd_effect(int funct,int data);
 char check_snd_effect(int funct);
 int  get_snd_effect(int funct);
 
 void *PrepareVideoSound(int mixfreq, int buffsize);
-char LoadNextVideoFrame(void *buffer, char *data, int size, short *xlat, short *accnums, int32_t *writepos);
+char LoadNextVideoFrame(void *buffer, const char *data, int size, const short *xlat, short *accnums, int32_t *writepos);
 void DoneVideoSound(void *buffer);
 
 
diff --git a/platform/file_access.cpp b/platform/file_access.cpp
index affb318..a154efd 100644
--- a/platform/file_access.cpp
+++ b/platform/file_access.cpp
@@ -61,6 +61,14 @@ char check_file_exists(const char *pathname) {
     return std::filesystem::exists(path)?1:0;
 
 }
+
+const char *file_icase_find(const char *pathname) {
+    static std::string p;
+    std::filesystem::path path = try_to_find_file(convert_pathname_to_path(pathname));
+    p = path;
+    return p.c_str();
+}
+
 FILE *fopen_icase(const char *pathname, const char *mode) {
     std::filesystem::path path = try_to_find_file(convert_pathname_to_path(pathname));
     return fopen(path.c_str(), mode);
diff --git a/platform/legacy_coroutines.cpp b/platform/legacy_coroutines.cpp
index 3af63f8..69e5c80 100644
--- a/platform/legacy_coroutines.cpp
+++ b/platform/legacy_coroutines.cpp
@@ -144,7 +144,10 @@ void term_task(int id_num) {
     }
 }
 char is_running(int id_num) {
-    return id_num < 0 || task_list.find(id_num) != task_list.end();
+    if (id_num < 0) return false;
+    auto iter = task_list.find(id_num);
+    if (iter == task_list.end()) return false;
+    return !iter->second->exited;
 }
 void unsuspend_task(EVENT_MSG *msg) {
     if (current_task_inst) return;
@@ -166,7 +169,7 @@ void task_sleep(void) {
     }
 }
 EVENT_MSG *task_wait_event(int32_t event_number) {
-    if (current_task_inst == NULL) return NULL;
+    if (current_task_inst == NULL || current_task_inst->request_exit || current_task_inst->exited) return NULL;
     current_task_inst->wake_up_msg = event_number;
     switch_to_task(NULL);
     return cur_message;
@@ -178,6 +181,14 @@ char task_quitmsg() {
     if (current_task_inst == NULL) return 0;
     return current_task_inst->request_exit?1:0;
 }
+
+void term_task_wait(int id_num) {
+    term_task(id_num);
+    while (is_running(id_num)) {
+        task_sleep();
+    }
+}
+
 char q_is_mastertask() {
     return current_task_inst == NULL;
 }
@@ -185,5 +196,8 @@ int q_current_task() {
     return current_task_inst?current_task_inst->id:-1;
 }
 void task_sleep_for(unsigned int time_ms) {
-
+    if (current_task_inst) {
+        current_task_inst->_wake_up_after = std::chrono::system_clock::now() + std::chrono::milliseconds(time_ms);
+    }
 }
+
diff --git a/platform/legacy_coroutines.h b/platform/legacy_coroutines.h
index ae42145..d622dbc 100644
--- a/platform/legacy_coroutines.h
+++ b/platform/legacy_coroutines.h
@@ -33,6 +33,7 @@ int add_task(int stack,TaskerFunctionName fcname,...);
 
  */
 void term_task(int id_num);
+void term_task_wait(int id_num);
 ///returns true, if task is running
 char is_running(int id_num);
 //void suspend_task(int id_num,int msg);
diff --git a/platform/platform.h b/platform/platform.h
index 09a7e4c..9f5ae30 100644
--- a/platform/platform.h
+++ b/platform/platform.h
@@ -64,6 +64,7 @@ void display_error(const char *text);
 ///returns -1 if doesn't exists
 char check_file_exists(const char *pathname);
 FILE *fopen_icase(const char *pathname, const char *mode);
+const char *file_icase_find(const char *pathname);
 
 int stricmp(const char *a, const char *b);
 #define MIN(a, b) ((a)<(b)?(a):(b))
diff --git a/platform/sdl/BGraph2.cpp b/platform/sdl/BGraph2.cpp
index bd42c32..db43325 100644
--- a/platform/sdl/BGraph2.cpp
+++ b/platform/sdl/BGraph2.cpp
@@ -89,13 +89,13 @@ int DxGetResY() {
 void setvesa_displaystart(int x,int y){
 
 }
-void StripBlt(void *data, unsigned int startline, uint32_t width) {
+void StripBlt(const void *data, unsigned int startline, uint32_t width) {
 
     unsigned short *start=startline*GetScreenPitch()+GetScreenAdr();
     while (width--)
     {
       memcpy(start,data,640*2);
-      data=(void *)(reinterpret_cast<short *>(data)+GetScreenPitch());
+      data=(void *)(reinterpret_cast<const short *>(data)+GetScreenPitch());
       start=start+GetScreenPitch();
     }
 
@@ -214,6 +214,12 @@ void DxDoneTurn(void *handle) {
     sdl.swap_display_buffers(); //present hidden buffer
 
 }
-void DxTurnLeftRight(char right, float phase, int border, int ypos, int *last) {
 
+
+char  game_display_is_quit_requested() {
+    return get_sdl_global_context().is_quit_requested()?1:0;
+}
+
+void game_display_cancel_quit_request() {
+    return get_sdl_global_context().cancel_quit_request();
 }
diff --git a/platform/sdl/BGraph2.h b/platform/sdl/BGraph2.h
index 83d85ba..64f398a 100644
--- a/platform/sdl/BGraph2.h
+++ b/platform/sdl/BGraph2.h
@@ -21,8 +21,8 @@ void RedirectScreenBufferSecond(void);
 char game_display_init(const INI_CONFIG_SECTION *display_section, const char *title);
 void game_display_close(void);
 void game_display_update_rect(unsigned short x,unsigned short y,unsigned short xs,unsigned short ys);
-
-
+char game_display_is_quit_requested();
+void game_display_cancel_quit_request();
 
 void *DxPrepareWalk(int ypos);
 void DxZoomWalk(void *handle, int ypos, int *points,float phase, void *lodka);
@@ -49,7 +49,7 @@ void DXMouseTransform(unsigned short *x, unsigned short *y);
 //HWND GetGameWindow();
 //void DxLockBuffers(BOOL lock);
 
-void StripBlt(void *data, unsigned int startline, uint32_t width);
+void StripBlt(const void *data, unsigned int startline, uint32_t width);
 
 
 #ifdef __cplusplus
diff --git a/platform/sdl/keyboard_map.h b/platform/sdl/keyboard_map.h
index 8323c95..f9d1e65 100644
--- a/platform/sdl/keyboard_map.h
+++ b/platform/sdl/keyboard_map.h
@@ -125,7 +125,8 @@ constexpr auto  sdl_keycode_map =  KeyCodeMap({
     {SDL_SCANCODE_KP_8,0x4838,0x4800,0x8D00},
     {SDL_SCANCODE_KP_9,0x4939,0x4900,0x8400},
     {SDL_SCANCODE_KP_0,0x5230,0x5200,0x9200},
-    {SDL_SCANCODE_KP_PERIOD,0x532E,0x5300,0x9300}
+    {SDL_SCANCODE_KP_PERIOD,0x532E,0x5300,0x9300},
+    {SDL_SCANCODE_KP_ENTER,0x1C0D,0x1C0D,0x1C0D}
 });
 
 
diff --git a/platform/sdl/sdl_context.cpp b/platform/sdl/sdl_context.cpp
index 3277dbc..196b76e 100644
--- a/platform/sdl/sdl_context.cpp
+++ b/platform/sdl/sdl_context.cpp
@@ -186,16 +186,13 @@ void SDLContext::event_loop(std::stop_token stp) {
     SDL_Event e;
     while (SDL_WaitEvent(&e)) {
         if (e.type == SDL_QUIT) {
-            return;
-        }
-        if (e.type == exit_loop_event) {
-            return;
-        }
-        if (e.type == _update_request_event) {
+            _quit_requested = true;
+            if (_quit_callback) _quit_callback();
+        } else if (e.type == exit_loop_event) {
+            break;
+        } else if (e.type == _update_request_event) {
             update_screen();
-        }
-
-         if (e.type == SDL_WINDOWEVENT) {
+        } else if (e.type == SDL_WINDOWEVENT) {
                 if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
                     _crt_effect.reset();
                 }
@@ -501,7 +498,7 @@ SDL_Rect SDLContext::to_window_rect(const SDL_Rect &winrc, const SDL_Rect &sourc
     SDL_Point wpt1(to_window_point(winrc, pt1));
     SDL_Point wpt2(to_window_point(winrc, pt2));
     return {wpt1.x, wpt1.y, wpt2.x - wpt1.x, wpt2.y - wpt1.y};
-
-
-
+}
+void SDLContext::set_quit_callback(std::function<void()> fn) {
+    _quit_callback = std::move(fn);
 }
diff --git a/platform/sdl/sdl_context.h b/platform/sdl/sdl_context.h
index ec260f5..8a433da 100644
--- a/platform/sdl/sdl_context.h
+++ b/platform/sdl/sdl_context.h
@@ -6,6 +6,7 @@
 #include <thread>
 #include <vector>
 #include <libs/mouse.h>
+#include <functional>
 
 #include <queue>
 
@@ -38,6 +39,7 @@ public:
     void show_slide_transition(const SDL_Rect &visible_from, const SDL_Rect &visible_where,
                                const SDL_Rect &hidden_from, const SDL_Rect &hidden_where);
 
+    void set_quit_callback(std::function<void()> fn);
     MS_EVENT getMsEvent()  {
         std::lock_guard _(_mx);
         MS_EVENT out = ms_event;
@@ -58,6 +60,12 @@ public:
     bool is_keyboard_ready() const;
     std::uint16_t pop_keyboard_code() ;
 
+    bool is_quit_requested() const {
+        return _quit_requested;
+    }
+    void cancel_quit_request() {
+        _quit_requested = false;
+    }
 
 protected:
 
@@ -97,6 +105,7 @@ protected:
     int aspect_x = 4;
     int aspect_y = 3;
     bool crt_filter_enabled = false;
+    std::function<void()> _quit_callback;
 
     std::unique_ptr<SDL_Window, SDL_Deleter> _window;
     std::unique_ptr<SDL_Renderer, SDL_Deleter> _renderer;
@@ -108,12 +117,12 @@ protected:
 
     std::jthread _render_thread;
 
-    bool _quit_requested = false;
     bool _fullscreen_mode = false;
     bool _present = false;
     std::atomic<bool> _key_control = false;
     std::atomic<bool> _key_shift = false;
     std::atomic<bool> _key_capslock = false;
+    std::atomic<bool> _quit_requested = false;
 
 
     std::vector<char> _display_update_queue;
diff --git a/platform/sdl/sound.cpp b/platform/sdl/sound.cpp
index 8056cc2..8667ffa 100644
--- a/platform/sdl/sound.cpp
+++ b/platform/sdl/sound.cpp
@@ -11,7 +11,7 @@ char start_mixing() {
 void stop_mixing() {
 
 }
-void play_sample(int channel,void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type) {
+void play_sample(int channel,const void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type) {
 
 }
 void set_channel_volume(int channel,int left,int right) {
@@ -50,7 +50,7 @@ void mute_channel(int channel) {
 void chan_break_loop(int channel) {
 
 }
-void chan_break_ext(int channel,void *org_sample,int32_t size_sample) {
+void chan_break_ext(int channel,const void *org_sample,int32_t size_sample) {
 
 }
 
@@ -67,7 +67,7 @@ int  get_snd_effect(int funct) {
 void *PrepareVideoSound(int mixfreq, int buffsize) {
     return 0;
 }
-char LoadNextVideoFrame(void *buffer, char *data, int size, short *xlat, short *accnums, int32_t *writepos) {
+char LoadNextVideoFrame(void *buffer, const char *data, int size, const short *xlat, short *accnums, int32_t *writepos) {
     std::this_thread::sleep_for(std::chrono::milliseconds(20));
     return 1;
 
diff --git a/skeldal.ini b/skeldal.ini
index 7a2e43a..668ccbb 100644
--- a/skeldal.ini
+++ b/skeldal.ini
@@ -43,4 +43,3 @@
 
 
 
-[audio]