1 程序: 2 assume cs:code 3 data segment 4 db "welcome to masm!",0 5 data ends 6 7 code segment 8 start: 9 mov dh,10 10 mov dl,10 11 mov cl,2 12 mov ax,data 13 mov ds,ax 14 mov si,0 15 int 7ch 16 mov ax,4c00h 17 int 21h 18 code ends 19 end start 20 21 7C中断例程: 22 assume cs:code 23 code segment 24 start: 25 mov ax,cs 26 mov ds,ax 27 mov si,offset do0 28 29 mov ax,0 30 mov es,ax 31 mov di,200h 32 33 mov cx,offset do0end-offset do0 34 cld 35 rep movsb 36 37 mov ax,0 38 mov ds,ax 39 mov word ptr ds:[7ch*4],200H 40 mov word ptr ds:[7ch*4+2],0H 41 42 mov ax,4c00h 43 int 21h 44 45 do0: 46 mov ax,0 47 mov bl,cl 48 49 s: 50 mov ah,2 51 mov bh,0 52 int 10h 53 54 mov ah,9 55 mov byte ptr al,ds:[si] 56 cmp byte ptr al,0 57 je ok 58 mov cx,1 59 int 10h 60 inc dl 61 inc si 62 jmp short s 63 ok: 64 iret 65 66 do0end: 67 nop 68 69 code ends 70 end start
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