assume cs:codesg
datasg segment
db "Beginner's All-purpose Symbolic Instruction Code.",0
datasg ends
codesg segment
start:
mov ax,datasg
mov ds,ax
mov si,0
call letterc
mov ax,4c00h
int 21h
letterc:
push ax
push cx
s: mov al,ds:[si]
mov ah,0
mov cx,ax
jcxz exit
cmp al,61h
jb continue
cmp al,7Ah
ja continue
and al,11011111B
mov ds:[si],al
continue:
inc si
loop s
exit:
pop cx
pop ax
retn
codesg ends
end start
汇编语言第3版 实验11 编写子程序
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转载自blog.csdn.net/duling2/article/details/84308502
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