书上p271的题,求改进
assume cs:codecode segment
s: db '00/00/00 00:00:00'
se: nop
row: db 9,8,7,4,2,0
start: call near ptr change ;改写字符串
call near ptr show ;显示字符串
mov ax,4c00h
int 21h
change: mov ax,cs
mov ds,ax
mov si,offset s
mov bx,offset row
mov cx,6
lp: mov al,
out 70h,al
in al,71h
push cx
mov ah,al
mov cl,4
shr ah,cl
and al,00001111b
add ah,30h
add al,30h
mov byte ptr ,ah
mov byte ptr ,al
add si,3
inc bx
pop cx
loop lp
ret
show: mov si,offset s
mov ax,0b800h
mov es,ax
mov di,160*12+30*2
mov cx,offset se -offset s
mov dl,11100001b
lp1: mov al,
mov byte ptr es:,al
inc di
mov byte ptr es:,dl
inc di
inc si
loop lp1
ret
code ends
end start
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