实验11代码
代码如下：assume cs:code,ds:data
data segment
db "Beginner's All-purpose Symbolic Instruction Code.",0
data ends
code segment
start:
mov ax,data
mov ds,ax
mov ax,0b878h
mov es,ax
mov si,0
mov di,0
call letterc
mov ax,4c00h
int 21h
letterc:
mov al,
cmp al,0
je exit
cmp al,'a'
jb s0
cmp al,'z'
ja s0
and al,11011111b
mov byte ptr ,al
s0:
;显示白底黑字
mov byte ptr es:,al
mov byte ptr es:1,01110000b
inc si
add di,2
jmp short letterc
exit:
ret
code ends
end start
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