在程序中依次出现‘a'~'z',并可以让人看清
start: mov ax,0b800hmov es,ax
mov ah,'a'
s: mov es:,ah
call s1
inc ah
cmp ah,'z'
jna s
mov ax,4c00h
int 21h
s1: push ax
push dx
mov dx,1000h
mov ax,0
s11: sub ax,1
sbb dx,0
cmp ax,0
jne s11
cmp dx,0
jne s11
pop dx
pop ax
ret
问题:
代码
cmp dx,0
jne s11
在程序整体运行时不能省去?单步执行时可以省去
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