程序没错呀，我直接复制过来，用masm6.15编译成功，运行正确。
DEC CH
cmp ch,0 ;这句忘了
JNZ LOP
disp proc near ;显示16进制数(字母大写)子程序，入口：BX寄存器存有二进制待显示数
mov dl,bh
mov cl,4
shr dl,cl
cmp dl,10
jc hex1
add dl,30h
hex1: add dl,37h
mov ah,02h
int 21h
mov dl,bh
and dl,0fh
cmp dl,10
jc hex2
add dl,30h
hex2: add dl,37h
mov ah,02h
int 21h
mov dl,bl
mov cl,4
shr dl,cl
cmp dl,10
jc hex3
add dl,30h
hex3: add dl,37h
mov ah,02h
int 21h
mov dl,bl
and dl,0fh
cmp dl,10
jc hex4
add dl,30h
hex4: add dl,37h
mov ah,02h
int 21h
mov dl,48h
mov ah,02h
int 21h
ret
disp endp
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