1 assume cs:code,ss:stack,ds:data 2 stack segment 3 db 128 dup (0) 4 stack ends 5 6 data segment 7 dw 0,0 8 data ends 9 10 code segment 11 start: 12 mov ax,stack 13 mov ss,ax 14 mov sp,128 15 16 mov ax,data 17 mov ds,ax 18 19 mov ax,0 20 mov es,ax 21 22 push es:[9*4] 23 pop ds:[0] 24 push es:[9*4+2] 25 pop ds:[2] 26 cli 27 mov word ptr es:[9*4],offset itt9 28 mov word ptr es:[9*4+2],cs 29 sti 30 31 call delay 32 33 mov ax,0 34 mov es,ax 35 36 push ds:[0] 37 pop es:[9*4] 38 push ds:[2] 39 pop es:[9*4+2] 40 41 mov ax,4c00h 42 int 21h 43 44 45 delay: 46 push ax 47 push dx 48 mov dx,0FFFFH 49 mov ax,0FFFH 50 s1: 51 sub ax,1 52 sbb dx,0 53 cmp ax,0 54 jne s1 55 cmp dx,0 56 jne s1 57 pop dx 58 pop ax 59 ret 60 61 62 63 itt9: 64 push ax 65 push bx 66 push es 67 push cx 68 69 70 71 in al,60h 72 73 pushf 74 call dword ptr ds:[0] 75 76 cmp al,9EH 77 jne ok 78 79 80 mov ax,0b800h 81 mov es,ax 82 mov bx,0 83 mov cx,2000 84 xh1: 85 mov byte ptr es:[bx],'A' 86 mov byte ptr es:[bx+1],02H 87 add bx,2 88 loop xh1 89 ok: 90 pop cx 91 pop es 92 pop bx 93 pop ax 94 iret 95 code ends 96 end start
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