assume cs:codesg
datasg segment
db "Beginner's All-purpose Symbolic Instruction Code.",0
datasg ends
codesg segment
begin: mov ax,datasg
mov ds,ax
mov si,0
call letterc
mov ax,4c00h
int 21h
letterc: pushf
push si
push cx
mov ch,0
s:mov cl,ds:[si]
jcxz ok
cmp byte ptr ds:[si],61h
jb next
cmp byte ptr ds:[si],90h
ja next
and byte ptr ds:[si],11011111b
next:inc si
jmp short s
ok:pop cx
pop si
popf
ret
codesg ends
end begin
王爽《汇编语言》实验11
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转载自blog.csdn.net/weixin_41944412/article/details/80385100
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