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- assume cs:code
- stack segment
- db 128 dup(0)
- stack ends
- data segment
- dw 0,0
- data ends
- code segment
- dong: mov ax,stack
- mov ss,ax
- mov sp,128
-
- mov ax,data
- mov ds,ax
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- mov ax,0
- mov es,ax
-
- push es:[9*4]
- pop ds:[0]
- push es:[9*4+2]
- pop ds:[2]
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- mov word ptr es:[9*4],offset int9
- mov es:[9*4+2],cs
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- mov ax,0b800h
- mov es,ax
- mov ah,'a'
- s:
- mov es:[160*12+40*2],ah
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- call delay
- inc ah
- cmp ah,'z'
- jna s
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- mov ax,0
- mov es,ax
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- push ds:[0]
- pop es:[9*4]
- push ds:[2]
- pop es:[9*4+2]
-
- mov ax,4c00h
- int 21h
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- delay:
- push ax
- push dx
- mov dx,1000h
- mov ax,0
- s1:
- sub ax,1
- sbb dx,0
- cmp dx,0
- jne s1
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- pop dx
- pop ax
- ret
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- int9:
- push ax
- push bx
- push es
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- in al,60h
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- pushf
- pushf
- pop bx
- and bh,11111100b
- push bx
- popf
- call dword ptr ds:[0]
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- cmp al,1
- jne int9ret
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- mov ax,0b800h
- mov es,ax
- inc byte ptr es:[160*12+40*2+1]
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- int9ret:
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- pop es
- pop bx
- pop ax
- iret
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- code ends
- end dong
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