1 程序: 2 assume cs:code 3 code segment 4 start: 5 mov ax,0b800h 6 mov es,ax 7 mov di,160*12+16*2 8 mov bx,offset s-offset se 9 mov cx,80 10 s: 11 mov byte ptr es:[di],'!' 12 add di,2 13 int 7ch 14 se: 15 nop 16 mov ax,4c00h 17 int 21h 18 code ends 19 end start 20 7ch中断例程: 21 assume cs:code 22 code segment 23 start: 24 mov ax,cs 25 mov ds,ax 26 mov si,offset do0 27 28 mov ax,0 29 mov es,ax 30 mov di,200h 31 32 mov cx,offset do0end-offset do0 33 cld 34 rep movsb 35 36 mov ax,0 37 mov ds,ax 38 mov word ptr ds:[7ch*4],200H 39 mov word ptr ds:[7ch*4+2],0H 40 41 mov ax,4c00h 42 int 21h 43 44 do0: 45 dec cx 46 jcxz ok 47 push bp 48 mov bp,sp 49 add [bp+2],bx 50 pop bp 51 ok: 52 iret 53 54 do0end: 55 nop 56 57 code ends 58 end start
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