ex3.asm

显示9-9乘法表和ASCII字符表（从20H--FFH） 基本功能 1 建立主菜单； 2分别显示9-9乘法表和ASCII字符表

extrn  ex1:far,ex2:far
stack segment

stack ends
data segment
m0 db '0',0AH,0DH,'$'
m1 db '1',0AH,0DH,'$'
m2 db 'INPUT ERROR!',0AH,0DH,'$'
data ends
code segment
assume cs:code,ds:data,ss:stack
ex3 PROC FAR

push ds 
XOR AX,AX
PUSH AX
MOV AX,DATA
MOV DS,AX

MOV AH,01
INT 21H

CMP AL,'0'
JZ LAB0
CMP AL,'1'
JZ LAB1
lea DX,m2
JMP disp3
LAB0:LEA DX,m0
JMP disp
LAB1:LEA DX,m1
JMP disp1
disp:mov ah,9
int 21h
call ex1
ret
disp1:mov ah,9
int 21h
call ex2
ret
disp3:mov ah,9
int 21h
ret
ex3 endp
code ends
end ex3