王爽《汇编语言》(第三版)实验14解析

代码

assume cs:code
data segment
	db '00/00/00 00:00:00','$'
	db 9,8,7,4,2,0
data ends

code segment	
start:	mov ax,data
		mov ds,ax
		mov di,0	
		mov si,18

		mov cx,6
	s:	
		mov al,[si] 
		out 70h,al
		in al,71h
		
		mov ah,al
		mov cl,4
		shr ah,cl
		and al,00001111b	

		add ah,30h
		add al,30h
		
		mov byte ptr [di],ah		;十位数码
		mov byte ptr [di+1],al	    ;个位数码
		inc si 
		add di,3	
		loop s
		
		mov ah,2
		mov bh,0
		mov dh,12
		mov dl,15
		int 10h
		
		mov ax,data	
		mov ds,ax
		mov dx,0
		mov ah,9
		int 21h
		
		mov ax,4c00h
		int 21h

code ends
end start