原码如下把四个字符串的前四个字母变成大写怎么后来d变成Ci编程H了求解啊？？
assumecs:code,ds:data,ss:stacksg
datasegment
db'1.display'
db'2.brows'
db'3.replace'
db'4.modify'
dataends
stacksgsegment
dw0,0,0,0,0,0,0,0
stacksgends
codesegment
start:movax,data
movds,ax
movax,stacksg
movss,ax[img=][/img]
movsp,16
movbx,0
movsi,3
movcx,4
movah,0
s:pushcx
movcx,4
movsi,3
s1:moval,[bx+si]
addal,11111111b
mov[bx+si],al
incsi
loops1
addbx,16
popcx
loops
movax,4c00h
int21h
codeends
endstart
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