1 assume cs:code 2 data segment 3 db 10 dup(0) 4 data ends 5 6 code segment 7 start: 8 mov ax,12666 9 mov bx,data 10 mov ds,bx 11 mov si,0 12 call dtoc 13 14 mov dh,8 15 mov dl,3 16 mov cl,2 17 call show_str 18 19 mov ax,4c00h 20 int 21h 21 22 dtoc: 23 push ax 24 push cx 25 push bx 26 push dx 27 push si 28 push di 29 30 31 mov bx,10 32 mov di,0 33 34 s0: 35 mov dx,0 36 div bx 37 add dx,30h 38 39 push dx ;用栈存储倒序的余数 40 inc di 41 42 mov cx,ax 43 44 jcxz ok0 45 46 jmp short s0 47 ok0: 48 49 50 mov cx,di 51 s1: 52 pop ax ;正序显示 53 mov [si],al 54 inc si 55 56 loop s1 57 58 pop di 59 pop si 60 pop dx 61 pop bx 62 pop cx 63 pop ax 64 ret 65 66 67 show_str: 68 push ax ;子程序用到的寄存器入栈 69 push bx 70 push cx 71 push di 72 push si 73 74 75 mov ax,0b800h 76 mov es,ax 77 78 mov al,160 79 dec dh 80 mul dh 81 mov bx,ax ;计算行偏移 82 83 dec dl 84 mov al,dl 85 mov ah,0 86 add bx,ax;计算列偏移 87 88 mov di,0 89 mov al,cl 90 s: 91 mov ch,0 92 mov cl,ds:[si] 93 94 jcxz ok 95 96 mov ch,al 97 98 mov es:[bx+di],cx 99 add di,2 100 inc si 101 loop s 102 ok: 103 pop si 104 pop di 105 pop cx 106 pop bx 107 pop ax 108 ret 109 110 code ends 111 end start