基本功能 1 建立主菜单；
2 按下相应键分别显示9-9乘法表和ASCII字符表。
希望解答能够详细点，也可以发邮件到cxh_dream@126.com，谢谢！！
------解决方案--------------------------------------------------------
冲着这40分去了。。乱是乱了点。。
;2009-5-29
;from damacheng(marcusxing)
;----------------------------------------------------------------
datasg segment
menuinfo db 'Menu',0ah,0dh,
'0 for print 9X9 multiplication table',0ah,0dh,
'1 for print ASCII table',0ah,0dh,'$'
errorinfo db 'illegal input,try again','$'
datasg ends
codesg segment
assume ds:datasg,cs:codesg
start:
mov ax,datasg
mov ds,ax
lea dx,menuinfo
mov ah,9
int 21h
mov ah,8
int 21h
cmp al,'0'
je Print99MultTable
cmp al,'1'
je PrintASCIITable
lea dx,errorinfo
mov ah,9
int 21h
exit:
mov ax,4c00h
int 21h
Print99MultTable:
mov bx,1
mov cx,1
s0:
mov ax,bx
push cx
mov cx,1
s3:
mov dl,bl
add dl,30h
mov ah,2
int 21h
mov dl,'*'
int 21h
mov dl,cl
add dl,30h
int 21h
mov dl,'='
int 21h
mov ax,bx
mov dl,bl
mul cl
call htod
mov ah,2
mov dl,20h
int 21h
inc cx
cmp cx,bx
jle s3
mov dl,0dh
mov ah,2
int 21h
mov dl,0ah
int 21h
pop cx
inc cx
cmp cx,10
inc bx
jb s0
jmp exit
PrintASCIITable:
xor dl,dl
mov cx,128
mov ah,2
s2:
int 21h
inc dl
loop s2
jmp exit
htod proc
push ax
push cx
push dx
push bx
xor cx,cx
mov bx,10
s:
xor dx,dx
div bx
inc cx
push dx
cmp ax,0
jne s
s1:
pop dx
add dl,30h
mov ah,2
int 21h
loop s1
pop bx
pop dx
pop cx
pop ax
ret
htod endp
codesg ends
end start