diff --git a/debug/system.txt b/debug/system.txt
index 7900b10..b3824e4 100644
--- a/debug/system.txt
+++ b/debug/system.txt
@@ -1,6 +1,6 @@
 target remote localhost:1234
 set disassembly-flavor intel
-set architecture i386
+set architecture i8086
 display/20i $pc+$cs*16
 break *0x80010
 cont
diff --git a/include/mem.h b/include/mem.h
index ed0228b..d21b8e4 100644
--- a/include/mem.h
+++ b/include/mem.h
@@ -150,25 +150,35 @@ macro   declare    fonction*
 
 macro stdcall proc,[arg]		; directly call STDCALL procedure
 { 
-common
+ common
+    size@ccall = 0
     if ~ arg eq
    reverse
     push arg
+    size@ccall = size@ccall+2
    common
     end if
     push cs
     call proc 
+    if size@ccall
+    add sp,size@ccall
+    end if 
 }
     
 macro invoke proc,[arg]		; directly call STDCALL procedure
  { 
  common
+    size@ccall = 0
     if ~ arg eq
    reverse
     push arg
+    size@ccall = size@ccall+2
    common
     end if
     call far [cs:proc] 
+    if size@ccall
+    add sp,size@ccall
+    end if 
  }
 
 macro proc [args]			; define procedure
@@ -195,11 +205,7 @@ macro epiloguedef procname,flag,parmbytes,localbytes,reglist
    if parmbytes | localbytes
     leave
    end if
-   if flag and 10000b
-    retn
-   else
-    retn parmbytes
-   end if }
+    retf }
 
 macro define@proc name,statement
  { local params,flag,regs,parmbytes,localbytes,current
@@ -211,7 +217,7 @@ macro define@proc name,statement
 				flag = 11b \}
    match =params, params \{ params equ statement
 			    flag = 0 \}
-   virtual at bp+4
+   virtual at bp+6
    match =uses reglist=,args, params \{ regs equ reglist
 					params equ args \}
    match =regs =uses reglist, regs params \{ regs equ reglist
@@ -219,7 +225,7 @@ macro define@proc name,statement
    match =regs, regs \{ regs equ \}
    match =,args, params \{ defargs@proc args \}
    match =args@proc args, args@proc params \{ defargs@proc args \}
-   parmbytes = $ - (bp+4)
+   parmbytes = $ - (bp+6)
    end virtual
    name # % = parmbytes/2
    all@vars equ
@@ -248,7 +254,7 @@ macro define@proc name,statement
       current = $-(bp-localbytes)
       end virtual \}
    macro ret operand
-   \{ match any, operand \\{ retn operand \\}
+   \{ match any, operand \\{ retf operand \\}
       match , operand \\{ match epilogue:reglist, epilogue@proc:<regs>
 			  \\\{ epilogue name,flag,parmbytes,localbytes,reglist \\\} \\} \}
    macro finish@proc \{ localbytes = (((current-1) shr 2)+1) shl 2
diff --git a/lib/3d.asm b/lib/3d.asm
index 718efd5..8bd6b38 100644
--- a/lib/3d.asm
+++ b/lib/3d.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\graphic.h"
 include "..\include\3d.h"
diff --git a/lib/bmp.asm b/lib/bmp.asm
index fd65db7..985aa40 100644
--- a/lib/bmp.asm
+++ b/lib/bmp.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 include "..\include\bmp.h"
diff --git a/lib/detect.asm b/lib/detect.asm
index 2c75c51..10e1e47 100644
--- a/lib/detect.asm
+++ b/lib/detect.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\cpu.h"
 include "..\include\pci.h"
diff --git a/lib/graphic.asm b/lib/graphic.asm
index bef5871..ef7477f 100644
--- a/lib/graphic.asm
+++ b/lib/graphic.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\graphic.h"
 
diff --git a/lib/lib.asm b/lib/lib.asm
index c6078fd..0e5968d 100644
--- a/lib/lib.asm
+++ b/lib/lib.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/lib/math.asm b/lib/math.asm
index e69de29..54a0d60 100644
--- a/lib/math.asm
+++ b/lib/math.asm
@@ -0,0 +1,32 @@
+use16
+align 1
+
+include "..\include\mem.h"
+
+org 0h
+
+header exe 1
+
+exporting
+declare random
+declare randomize
+ende
+
+randseed        dw 1234h 
+
+proc random uses dx
+    mov     ax,[cs:randseed]
+    mov     dx,8405h
+    mul     dx
+    inc     ax
+    mov     [cs:randseed],ax
+    mov     ax,dx
+    retf
+endp
+
+proc randomize uses ax cx dx
+    mov     ah,0
+    int     1ah
+    mov     [cs:randseed],dx
+    retf
+endp
diff --git a/lib/str0.asm b/lib/str0.asm
index 97c9ac2..59bfe21 100644
--- a/lib/str0.asm
+++ b/lib/str0.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/lib/video.asm b/lib/video.asm
index baeca5e..eef7229 100644
--- a/lib/video.asm
+++ b/lib/video.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 
 org 0h
diff --git a/makefile b/makefile
index f6acef6..cf86b4d 100644
--- a/makefile
+++ b/makefile
@@ -26,6 +26,10 @@ view: final/cos2000.img
 view2: boot/boot12.bin
 	(objdump -D -b binary -mi386 -Maddr16,data16 ./boot/boot12.bin)
 
+debug: debug-system
+
+redebug: clean debug
+
 debug-boot: all copy qemu-debug
 	(sleep 2;cgdb -x ./debug/boot.txt)
 
@@ -33,10 +37,10 @@ debug-system: all copy qemu-debug
 	(sleep 2;cgdb -x ./debug/system.txt)
 
 qemu-debug:
-	(qemu-system-i386 -m 1G -fda ./final/cos2000.img -s -S &)
+	(killall qemu-system-i386;qemu-system-i386 -m 1G -fda ./final/cos2000.img -s -S &)
 
 qemu:
-	(qemu-system-i386 -m 1G -fda ./final/cos2000.img -s)    
+	(killall qemu-system-i386;qemu-system-i386 -m 1G -fda ./final/cos2000.img -s)    
 	
 noyau/systeme.sys:
 	make -C noyau
diff --git a/noyau/8259a.asm b/noyau/8259a.asm
index 943abae..0799eda 100644
--- a/noyau/8259a.asm
+++ b/noyau/8259a.asm
@@ -45,7 +45,7 @@ proc enableirq uses ax cx dx, irq:word
         in     al,dx
         and    al,ah
         out    dx,al
-        retf
+        ret
 endp
 
 ;Desactive une interruption ‚lectronique
@@ -66,7 +66,7 @@ proc disableirq uses ax cx dx, irq:word
         in     al,dx
         or     al,ah
         out    dx,al
-        retf
+        ret
 endp
 
 
@@ -80,7 +80,7 @@ proc seteoi uses ax dx, irq:word
 .master:
        mov     al,EOI
        out     MASTERPIC,al
-       retf
+       ret
 endp
 
 
@@ -95,7 +95,7 @@ proc readimr uses bx dx, controleur:word
        xor     ah,ah
        in      al,dx
        pop     dx
-       retf
+       ret
 endp
 
 ;Lit le registre d'‚tat d'un contr“leur IRQ dans ax, 0 master ou slave 1 ds %1
@@ -110,7 +110,7 @@ proc readisr uses bx dx, controleur:word
        out     dx,al
        xor     ah,ah
        in      al,dx
-       retf
+       ret
 endp
 
 
@@ -126,7 +126,7 @@ proc readirr uses bx dx, controleur:word
        out     dx,al
        xor     ah,ah
        in      al,dx
-       retf
+       ret
 endp
 
 ;carry si enable et pas carry si pas enable
@@ -142,7 +142,7 @@ proc isenableirq uses ax cx dx, irq:word
         in     al,dx
         neg    al
         bt     ax,cx
-        retf
+        ret
 endp
 
 
@@ -161,7 +161,7 @@ proc isinserviceirq uses ax cx dx, irq:word
         in     al,dx
         neg    al
         bt     ax,cx
-        retf
+        ret
 endp
 
 
@@ -180,7 +180,7 @@ proc isrequestirq uses ax cx dx, irq:word
         in     al,dx
         neg    al
         bt     ax,cx
-        retf
+        ret
 endp
 
 
@@ -258,7 +258,7 @@ proc installirqhandler uses eax bx cx edx si di ds es
 .end:
        pop     fs
        sti
-       retf
+       ret
 endp
 
 
@@ -309,7 +309,7 @@ pop   [.regs.secx]
 pop   [.regs.sebx]
 pop   [.regs.seax]
 pop   [.regs.seflags]
-retf
+ret
 endp
 
 proc restorecontextg, pointer:word
@@ -332,7 +332,7 @@ mov ds,[cs:.regs.sds]
 popfd
 pop esi
 pop [cs:dummy]
-db 0xCA,0x02,0x00 ;retf 2
+db 0xCA,0x02,0x00 ;ret 2
 endp
 
 
diff --git a/noyau/mcb.asm b/noyau/mcb.asm
index f2d818d..5582f51 100644
--- a/noyau/mcb.asm
+++ b/noyau/mcb.asm
@@ -20,7 +20,7 @@ proc biosprinth uses ax bx cx edx si di, num:dword
         int     10h
         dec     di
         jnz     .hexaize
-        retf
+        ret
 .tab db '0123456789ABCDEF'
 endp
 
@@ -42,7 +42,7 @@ proc biosprint uses ax bx cx si, pointer:word
         int    10h
         jmp    .again
 .fin:
-        retf
+        ret
 endp
 
 proc enablea20 uses ax
@@ -55,7 +55,7 @@ proc enablea20 uses ax
         ;mov     al,0ffh
         ;out     64h,al
         ;call    a20wait
-        retf
+        ret
 endp
 
 proc disablea20 uses ax
@@ -68,7 +68,7 @@ proc disablea20 uses ax
         ;mov     al,0ffh
         ;out     64h,al
         ;call    a20wait
-        retf
+        ret
 endp
 
 a20wait:
@@ -114,7 +114,7 @@ proc flatmode uses eax bx ds
         jmp     .suite2
 .suite2:
         sti                     ; resume handling interrupts
-        retf                     ;
+        ret                     ;
         
 .gdt:
 gdtitse descriptor .gdtend - .gdt - 1, .gdt, 0, 0, 0, 0  ; the GDT itself
@@ -126,7 +126,7 @@ endp
 proc bioswaitkey uses ax
         xor    ax,ax
         int    16h
-        retf
+        ret
 endp
 
 firstmb dw 0
@@ -184,16 +184,16 @@ popad
         dec     si
         jmp     .finishloading
 .finishdepands:
-        retf
+        ret
 .notace:
         stc
-        retf
+        ret
 .error:
         stc
-        retf
+        ret
 .depandserror:
         stc
-        retf
+        ret
        .toresov dw 60 dup (0)
 endp
         
@@ -215,10 +215,10 @@ proc mbinit uses ax cx si di ds es
         mov     cx,.mb.sizeof
         rep     movsb
 	clc
-	retf
+	ret
 .alreadyok:
 	stc
-	retf
+	ret
 endp
 
 afree mb "HN",0,0,0,0A000h-memorystart,"Libre"
@@ -294,7 +294,7 @@ proc mbcreate uses bx cx dx si di ds es, blocks:word, size:word
 	mov	ax,bx
 	pop     gs
 	clc
-	retf
+	ret
 .notsogood:
         inc     bx
         inc     bx
@@ -303,11 +303,11 @@ proc mbcreate uses bx cx dx si di ds es, blocks:word, size:word
 .memoryerror:
 	pop     gs
 	stc
-	retf
+	ret
 .notenougtmem:
         pop     gs
         stc
-        retf
+        ret
 endp
 
 ;Libère le bloc de mémoire %0 et ses sous blocs
@@ -359,16 +359,16 @@ proc mbfree uses ax bx cx si di ds es, blocks:word
         cmp	[es:.mb.isnotlast],true
 	je	.searchtofree
         stdcall    mbclean	
-	retf
+	ret
 .memoryerror:
 	stc
-	retf
+	ret
 .wasfree:
 	stc
-	retf
+	ret
 .wasresident:
 	stc
-	retf
+	ret
         	
 .isfree db "libre",0
 endp
@@ -422,13 +422,13 @@ proc mbclean uses ax bx dx es gs
         mov     [es:.mb.isnotlast],false
 .reallyfinish:
 	clc
-	retf
+	ret
 .notenougtmem:
         stc
-        retf
+        ret
 .memoryerror:
 	stc
-	retf
+	ret
 endp
 
 ;Rend le segment %0 résident
@@ -443,10 +443,10 @@ proc mbresident uses bx es, blocks:word
 	cmp	word [es:.mb.check],"NH"
 	jne	.memoryerror	
 	mov	[es:.mb.isresident],true
-	retf
+	ret
 .memoryerror:
         stc
-        retf
+        ret
 endp
 	
 ;Rend le segment %0 non résident
@@ -461,10 +461,10 @@ proc mbnonresident uses bx es, blocks:word
 	cmp	word [es:.mb.check],"NH"
 	jne	.memoryerror	
 	mov	[es:.mb.isresident],false
-	retf
+	ret
 .memoryerror:
         stc
-        retf
+        ret
 endp
 
 
@@ -483,13 +483,13 @@ proc mbchown uses bx dx es,blocks:word, owner:word
 	je	.wasfree
 	mov     dx,[owner]
 	mov	[es:.mb.reference],dx
-	retf
+	ret
 .memoryerror:
 	stc
-	retf
+	ret
 .wasfree:
 	stc
-	retf
+	ret
 endp
 	
 ;Alloue un bloc /data de CX caractere pour le process appelant -> ax
@@ -498,7 +498,7 @@ proc mballoc uses si ds, size:word
 	pop     ds
 	stdcall    mbcreate,.data,[size]
 	stdcall    mbchown,ax,word [ss:bp+4]
-	retf
+	ret
 
 .data db '/data',0
 endp
@@ -529,16 +529,16 @@ proc mbget uses bx dx es, num:word
 	je	.searchfree
 .memoryerror:
 	stc
-	retf
+	ret
 .foundmcb:
         mov     ax,es
         inc     ax
         inc     ax
 	clc
-	retf
+	ret
 .notfound:
  	stc
-	retf
+	ret
 endp 		
 	
 ;Renvoie en AX le MCB qui correspond a ds:%0
@@ -577,16 +577,16 @@ proc mbfind uses bx si di es, blocks:word
 	je	.search
 .notfound:
 	stc
-	retf
+	ret
 .memoryerror:
         stc
-        retf
+        ret
 .foundmcb:
         mov     ax,es
         inc     ax
         inc     ax
 	clc
-	retf
+	ret
 endp
 
 		
@@ -630,16 +630,16 @@ proc mbfindsb uses bx dx si di es, blocks:word, owner:word
 	je	.search
 .notfound:
 	stc
-	retf
+	ret
 .foundmcb:
         mov     ax,es
         inc     ax
         inc     ax
 	clc
-	retf
+	ret
 .memoryerror:
         stc
-        retf
+        ret
 endp
 
 ;Resouds les dépendances du bloc de mémoire %0
@@ -689,16 +689,16 @@ proc mbloadfuncs uses ax bx cx dx si ds, blocks:word
         jmp     .loadfuncs
 .endofloading:
         clc
-        retf
+        ret
 .notace:
         stc
-        retf
+        ret
 .libnotexist:
         stc
-        retf
+        ret
 .erroronload:
         stc
-        retf
+        ret
 endp
 
 
@@ -751,8 +751,8 @@ proc mbsearchfunc uses bx si di es, func:word
         mov     dx,es
         mov     ax,[es:di+1]
         clc
-        retf
+        ret
 .notfoundattallthesb:
         stc
-        retf
+        ret
 endp
diff --git a/noyau/systeme.asm b/noyau/systeme.asm
index e951ec6..2cddb7b 100644
--- a/noyau/systeme.asm
+++ b/noyau/systeme.asm
@@ -1,3 +1,5 @@
+use16
+align 1
 
 include "..\include\mem.h"
 include "..\include\divers.h"
diff --git a/noyau/video.asm b/noyau/video.asm
index 2c970ee..b13cc00 100644
--- a/noyau/video.asm
+++ b/noyau/video.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\graphic.h"
 
diff --git a/programs/commande.asm b/programs/commande.asm
index 156254c..b964975 100644
--- a/programs/commande.asm
+++ b/programs/commande.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\fat.h"
 include "..\include\mem.h"
 include "..\include\divers.h"
diff --git a/programs/editeur.asm b/programs/editeur.asm
index 8d5b546..2e007a3 100644
--- a/programs/editeur.asm
+++ b/programs/editeur.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 include "..\include\graphic.h"
diff --git a/programs/exem.asm b/programs/exem.asm
index 82a5c6b..bb6d622 100644
--- a/programs/exem.asm
+++ b/programs/exem.asm
@@ -1,3 +1,5 @@
+use16
+align 1
 
 include "..\include\mem.h"
 include "..\include\divers.h"
diff --git a/programs/gestion.asm b/programs/gestion.asm
index c86b942..50d03ae 100644
--- a/programs/gestion.asm
+++ b/programs/gestion.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\fat.h"
 include "..\include\divers.h"
diff --git a/programs/isa.asm b/programs/isa.asm
index ac8929c..e005e05 100644
--- a/programs/isa.asm
+++ b/programs/isa.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/logo.asm b/programs/logo.asm
index e11a447..af7f272 100644
--- a/programs/logo.asm
+++ b/programs/logo.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/pmode.asm b/programs/pmode.asm
index c68f0d8..cc445e6 100644
--- a/programs/pmode.asm
+++ b/programs/pmode.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/souris.asm b/programs/souris.asm
index 1efb39f..a5b4f01 100644
--- a/programs/souris.asm
+++ b/programs/souris.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/test.asm b/programs/test.asm
index 07e0706..8f48fa7 100644
--- a/programs/test.asm
+++ b/programs/test.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/test2d.asm b/programs/test2d.asm
index fd322d0..2811280 100644
--- a/programs/test2d.asm
+++ b/programs/test2d.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\fat.h"
 include "..\include\divers.h"
diff --git a/programs/test3d.asm b/programs/test3d.asm
index 224f7a5..86030c6 100644
--- a/programs/test3d.asm
+++ b/programs/test3d.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\fat.h"
 include "..\include\divers.h"
diff --git a/programs/verifier.asm b/programs/verifier.asm
index 5b15051..f761ec0 100644
--- a/programs/verifier.asm
+++ b/programs/verifier.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 
diff --git a/programs/volume.asm b/programs/volume.asm
index 4853a51..1ecff11 100644
--- a/programs/volume.asm
+++ b/programs/volume.asm
@@ -1,3 +1,6 @@
+use16
+align 1
+
 include "..\include\mem.h"
 include "..\include\divers.h"
 include "..\include\graphic.h"