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.model tiny |
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.486 |
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smart |
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.code |
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org 0100h |
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start: |
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mov si,offset video |
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mov bx,400h |
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mov ax,47h |
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call installhandler |
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jc erroron |
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mov si,offset timer |
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mov bx,900h |
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mov ax,8h |
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call replacehandler |
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jc erroron |
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mov si,offset pic |
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mov bx,950h |
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mov ax,50h |
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call installhandler |
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jc erroron |
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mov si,offset drive |
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mov bx,1020h |
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mov ax,48h |
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call installhandler |
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jc erroron |
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mov si,offset keyboard |
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mov bx,1400h |
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mov ax,9h |
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call replacehandler |
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jc erroron |
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mov ax,40h |
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mov es,ax |
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mov dx,es:[8] |
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cmp dx,0 |
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je nolpt1 |
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mov al,0FFh |
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add dx,2 |
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out dx,al |
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mov si,offset lpt |
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mov bx,1500h |
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mov ax,0Fh |
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call installhandler |
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jc erroron |
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mov es,bx |
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sub al,8 |
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xor ah,ah |
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int 50h |
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mov byte ptr es:[105h],'1' |
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nolpt1: |
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push es |
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mov ax,40h |
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mov es,ax |
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mov dx,es:[10] |
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pop es |
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cmp dx,0 |
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je nolpt2 |
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mov al,0FFh |
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add dx,2 |
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out dx,al |
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mov si,offset lpt |
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mov bx,1700h |
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mov ax,0Dh |
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call installhandler |
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jc erroron |
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sub al,8 |
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xor ah,ah |
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int 50h |
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mov es,bx |
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mov byte ptr es:[105h],'2' |
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nolpt2: |
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mov si,offset mouse |
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mov bx,1900h |
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mov ax,74h |
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call installhandler |
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jc erroron |
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mov ax,0012 |
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int 50h |
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mov ah,2 |
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int 74h |
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;mov si,offset joystick |
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;mov bx,2700h |
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;mov ax,08h |
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;call replacehandler |
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mov si,offset hours |
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mov bx,2900h |
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mov ax,08h |
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call replacehandler |
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start2: |
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push cs |
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push cs |
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pop ds |
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pop es |
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mov ah,21 |
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mov cl,7 |
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int 47h |
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mov ax,0002 |
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int 47h |
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mov ah,2 |
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int 47h |
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mov ah,25 |
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mov bx,0 |
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int 47h |
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mov ah,13 |
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mov si,offset msg1 |
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int 47h |
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mov ah,6 |
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int 47h |
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int 47h |
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mov ah,13 |
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mov si,offset prompt |
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int 47h |
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mov ah,6 |
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int 47h |
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xor di,di |
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mov ax,0001h |
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mov bx,offset buffer |
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mov cx,13 |
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int 48h |
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xor bp,bp |
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showall: |
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cmp byte ptr [bx+di],0 |
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je endof2 |
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mov al,[bx+di+12] |
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mov byte ptr [bx+di+12],0 |
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mov si,bx |
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add si,di |
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mov ah,13 |
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int 47h |
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mov si,offset spaces |
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int 47h |
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mov [bx+di+12],al |
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mov byte ptr [bx+di+12+5],0 |
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mov si,bx |
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add si,di |
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add si,12 |
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int 47h |
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mov ah,6 |
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int 47h |
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add di,32 |
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inc bp |
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jmp showall |
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endof2: |
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mov ah,21 |
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mov cl,112 |
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int 47h |
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mov ah,13 |
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mov si,offset menu |
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int 47h |
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mov xx,1 |
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mov xxold,2 |
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call Select |
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endof: |
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mov ax,0 |
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int 16h |
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cmp ah,50h |
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jne tre1 |
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cmp xx,bp |
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je endof |
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inc xx |
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call select |
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jmp endof |
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tre1: |
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cmp ah,48h |
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jne tre2 |
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cmp xx,1 |
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je endof |
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dec xx |
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call select |
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jmp endof |
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tre2: |
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cmp al,0Dh |
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jne tre3 |
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mov di,xx |
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dec di |
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shl di,5 |
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mov dx,[di+bx+26] |
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cmp [di+bx+12],00657865h ;EXE |
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jne tre3 |
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mov ah,6 |
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int 47h |
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int 47h |
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mov ah,21 |
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mov cl,7 |
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int 47h |
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mov ah,13 |
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mov si,offset msg2 |
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int 47h |
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mov cx,dx |
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call executefatway |
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tre3: |
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cmp ah,59 |
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jne tre4 |
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mov lastread,0FFFFh |
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jmp start2 |
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tre4: |
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cmp ah,67 |
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jne endof |
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mov ax,0001 |
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int 47h |
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mov ah,2 |
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int 47h |
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mov ah,21 |
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mov cl,4 |
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int 47h |
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mov ah,13 |
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mov si,offset msg3 |
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int 47h |
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mov ax,0 |
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int 16h |
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mov ax,40h |
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mov ds,ax |
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mov bx,1234h |
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mov ds:[072h],bx |
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push 0FFFFh |
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push 0000h |
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db 0CBh |
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executefatway: |
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push cs |
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mov bx,offset start2 |
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push bx |
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mov bx,03000h |
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mov es,bx |
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push bx |
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mov bx,0100h |
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push bx |
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call loadfatway |
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push es |
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push es |
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push es |
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pop ds |
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pop fs |
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pop gs |
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push 7202h |
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popf |
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db 0CBh |
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;selectionne la ligne xx |
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Select: |
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push ax di |
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mov di,xxold |
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mov al,7 |
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add di,2 |
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mov ah,32 |
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int 47h |
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mov ax,xx |
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mov xxold,ax |
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mov di,xx |
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mov ah,32 |
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mov al,112 |
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add di,2 |
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int 47h |
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pop di ax |
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ret |
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xx dw 1 |
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xxold dw 0 |
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menu db 'F1 Read disk F2 Read file F9 Quit F11 Change video F12 Debug ',0 |
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msg1 db ' Cos 2000 menu loader release 1.0',0 |
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msg2 db 'The program is loading',0 |
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msg3 db ' Cos will restart your computer, eject the floppy disk and press a key',0 |
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prompt db '>',0 |
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spaces db ' ',0 |
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dot db '.',0 |
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;cx entr<EFBFBD>e -> fatway chemin |
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getfatway: |
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push bx cx |
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mov bx,offset fatway |
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fatagain: |
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mov cs:[bx],cx |
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add bx,2 |
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cmp cx,0FFF0h |
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jae finishload |
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call getfat |
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jnc fatagain |
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finishload: |
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pop cx bx |
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ret |
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;Charge le fichier de chemin cx -> taille dx |
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loadfatway: |
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push ax bx cx di |
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call getfatway |
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jc endload |
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mov di,offset fatway |
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mov si,offset dot |
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mov ah,13 |
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xor dx,dx |
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loadagain: |
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mov cx,cs:[di] |
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cmp cx,0FFF0h |
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jae endload |
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add di,2 |
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call readsector |
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jc endload |
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add bx,cs:sizec |
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add dx,cs:sizec |
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jmp loadagain |
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endload: |
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pop di cx bx ax |
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ret |
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sizec dw 512 |
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reserv dw 1 |
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;<-cx n<EFBFBD>secteur ->cx code FAT |
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getfat: |
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push es ax bx dx |
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push cs |
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pop ds |
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push cs |
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pop es |
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mov ax,cx |
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xor dx,dx |
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div sizec |
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mov cx,ax |
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add cx,reserv |
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mov bx,offset buffer |
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call readsector |
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jc errorgetfat |
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shl dx,1 |
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add bx,dx |
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mov cx,[bx] |
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errorgetfat: |
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pop dx bx ax es |
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ret |
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ReadSector: |
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push ax cx dx si |
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cmp cx,cs:lastread |
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je done |
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mov cs:LastRead,cx |
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mov AX, CX |
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xor DX, DX |
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div cs:DiskSectorsPerTrack |
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mov CL, DL ;{ Set the sector } |
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and CL, 63 ;{ Top two bits are bits 8&9 of the cylinder } |
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xor DX, DX |
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div cs:DiskTracksPerHead |
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mov CH, DL ;{ Set the track bits 0-7 } |
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mov AL, DH |
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ror AL, 1 |
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ror AL, 1 |
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and AL, 11000000b |
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or CL, AL ;{ Set bits 8&9 of track } |
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xor dX, DX |
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div cs:DiskHeads |
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mov DH, DL ;{ Set the head } |
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inc CL |
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mov SI, 4 |
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TryAgain: |
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mov AL, 1 |
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mov DL, 0 |
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mov AH, 2 |
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int 13h |
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jnc Done |
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dec SI |
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jnz TryAgain |
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mov word ptr cs:lastread,0ffffh |
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Done: |
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pop si dx cx ax |
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ret |
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WriteSector: |
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push ax cx dx si |
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cmp cs:Lastread,cx |
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jne nodestruct |
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mov cs:Lastread,0ffffh |
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nodestruct: |
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mov AX, CX |
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xor DX, DX |
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div cs:DiskSectorsPerTrack |
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mov CL, DL ;{ Set the sector } |
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and CL, 63 ;{ Top two bits are bits 8&9 of the cylinder } |
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xor DX, DX |
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div cs:DiskTracksPerHead |
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mov CH, DL ;{ Set the track bits 0-7 } |
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mov AL, DH |
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ror AL, 1 |
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ror AL, 1 |
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and AL, 11000000b |
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or CL, AL ;{ Set bits 8&9 of track } |
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xor DX, DX |
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div cs:DiskHeads |
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mov DH, DL ;{ Set the head } |
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inc CL |
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mov SI, 4 |
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TryAgain2: |
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mov AL, 1 |
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mov DL, 0 |
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mov AH, 3 |
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int 13h |
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jnc Done2 |
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dec SI |
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jnz TryAgain2 |
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Done2: |
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pop si dx cx ax |
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ret |
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Lastread dw 0FFFFh |
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;remplace le handler pointer par ds:si en bx:100h interruption ax |
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replacehandler: |
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push ax bx cx si di ds es |
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mov es,bx |
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mov di,0100h |
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call loadfile |
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jc reph |
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mov bx,ax |
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call getint |
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mov es:[102h],si |
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mov es:[104h],ds |
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call setint |
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reph: |
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pop es ds di si cx bx ax |
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ret |
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;install le handler pointer par ds:si en bx:100h interruption ax |
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installhandler: |
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push bx cx di es |
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mov es,bx |
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mov di,100h |
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call loadfile |
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jc insh |
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mov bx,ax |
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call setint |
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insh: |
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pop es di cx bx |
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ret |
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;Charge le fichier Ds:si en es:di taille-> cx |
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loadfile: |
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push bx |
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call searchfile |
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jc errorloadfile |
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mov bx,di |
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call loadfatway |
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jc errorloadfile |
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mov cx,dx |
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errorloadfile: |
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pop bx |
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ret |
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;met es:di le handle de l'int bx |
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setint: |
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push ax bx ds |
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cli |
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shl bx,2 |
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xor ax,ax |
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mov ds,ax |
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mov ds:[bx],di |
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mov ds:[bx+2],es |
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pop ds bx ax |
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sti |
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ret |
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;met ds:si le handle de l'int bx |
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getint: |
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push ax bx es |
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shl bx,2 |
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xor ax,ax |
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mov es,ax |
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mov si,es:[bx] |
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mov ds,es:[bx+2] |
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pop es bx ax |
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ret |
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;Recherche le fichier et retourne sont path et en cx sont debut |
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Searchfile: |
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push ax bx dx si di ds es |
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push cs |
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pop es |
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xor dx,dx |
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mov di,offset temp |
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call asciiztofit |
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push cs |
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pop ds |
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mov cx,13 |
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check: |
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mov bx,offset buffer |
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call readsector |
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jc errorboot |
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xor di,di |
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findnext: |
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cmp byte ptr [bx+di],0 |
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je errorboot |
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push si di cx |
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mov si,di |
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add si,bx |
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mov di,offset temp |
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mov cx,12+4 |
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cld |
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rep cmpsb |
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pop cx di si |
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je oksystem |
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add di,32 |
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inc dx |
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cmp dx,nbfit |
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ja errorboot |
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cmp di,sizec |
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jb findnext |
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inc cx |
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jmp Check |
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oksystem: |
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mov cx,[di+BX+26] |
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cld |
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jmp goodboot |
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errorboot: |
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stc |
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goodboot: |
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pop es ds di si dx bx ax |
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ret |
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;->name ds:si ->es:di |
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AsciiZtoFit: |
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push ax bx cx dx si di ds es |
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xor bx,bx |
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mov dx,di |
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noextens: |
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mov al,[si+bx] |
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cmp al,'.' |
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je extens |
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call Issystchar |
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jc errortranslate |
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mov es:[di],al |
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inc di |
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inc bx |
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cmp bx,namesize ;(.) |
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jne noextens |
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erro: |
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stc |
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jmp errortranslate |
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extens: |
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add si,bx |
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inc si |
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sub bx,namesize |
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neg bx |
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mov al,0 |
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mov cx,bx |
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cld |
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rep stosb |
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xor bx,bx |
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wasextens: |
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mov al,[si+bx] |
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cmp al,0 |
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je endextens |
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call Issystchar |
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jc errortranslate |
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mov es:[di],al |
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inc di |
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inc bx |
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cmp bx,extsize |
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jne wasextens |
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jmp erro |
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endextens: |
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sub bx,extsize |
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neg bx |
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mov al,0 |
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mov cx,bx |
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cld |
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rep stosb |
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mov si,dx |
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mov di,dx |
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push es |
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pop ds |
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mov cx,extsize+namesize |
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call uppercaseMEM |
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clc |
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endtranslate: |
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pop es ds di si dx cx bx ax |
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ret |
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errortranslate: |
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stc |
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jmp endtranslate |
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;Carry si al = caract<EFBFBD>re syst<EFBFBD>me |
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isSystchar: |
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push di |
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mov di,offset exeptchar |
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isexcept: |
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cmp al,cs:[di] |
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je nogood |
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inc di |
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cmp byte ptr cs:[di],0 |
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jne isexcept |
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endanal: |
|
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clc |
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pop di |
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ret |
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nogood: |
|
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stc |
|
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jmp endanal |
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;Transforme les x caract<EFBFBD>res de la mem en ds:si en maj |
|
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uppercaseMEM: |
|
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push si di cx ax |
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mov di,si |
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uppercaser: |
|
|
mov al,ds:[si] |
|
|
inc si |
|
|
cmp al,'A' |
|
|
jb nonmaj |
|
|
cmp al,'Z' |
|
|
ja nonmaj |
|
|
add al,'a'-'A' |
|
|
nonmaj: |
|
|
mov es:[di],al |
|
|
inc di |
|
|
dec cx |
|
|
jnz uppercaser |
|
|
enduppercase: |
|
|
clc |
|
|
pop ax cx di si |
|
|
ret |
|
|
|
|
|
erroron: |
|
|
push cs |
|
|
pop ds |
|
|
xor edx,edx |
|
|
mov dx,ax |
|
|
mov ax,0001h |
|
|
int 47h |
|
|
mov ah,6 |
|
|
int 47h |
|
|
mov ah,6 |
|
|
int 47h |
|
|
mov ah,13 |
|
|
mov si,offset errormsg |
|
|
int 47h |
|
|
mov ah,10 |
|
|
mov cx,16 |
|
|
int 47h |
|
|
mov ah,6 |
|
|
int 47h |
|
|
mov ah,6 |
|
|
int 47h |
|
|
mov ah,13 |
|
|
mov si,offset errormsg2 |
|
|
int 47h |
|
|
mov ax,0 |
|
|
int 16h |
|
|
push 0FFFFh |
|
|
push 0 |
|
|
db 0CBh |
|
|
|
|
|
errormsg db 'Error with drivers loading on interrupt n<EFBFBD>',0 |
|
|
errormsg2 db 'Press a key to restart...',0 |
|
|
namesize equ 12 |
|
|
extsize equ 5 |
|
|
nbfit equ 255 |
|
|
hours db 'hours.sys',0 |
|
|
joystick db 'joystick.sys',0 |
|
|
mouse db 'mouse.sys',0 |
|
|
pic db 'pic8259a.sys',0 |
|
|
drive db 'drive.sys',0 |
|
|
timer db 'timer.sys',0 |
|
|
lpt db 'lpt.sys',0 |
|
|
video db 'video.sys',0 |
|
|
keyboard db 'keyboard.sys',0 |
|
|
temp db 12+5+1 dup (0) |
|
|
exeptchar db '/\<>:|.',01,0,0 |
|
|
DiskSectorsPerTrack dw 18 |
|
|
DiskTracksPerHead dw 80 |
|
|
DiskHeads dw 2 |
|
|
|
|
|
fatway equ $ |
|
|
|
|
|
buffer equ $+3000 |
|
|
|
|
|
end start
|
|
|
|
