问个简单的运算问题 - 编程论坛

autorun2008-08-06 20:10

写得很马虎，连注释都没时间写........
显示出结果就是将一个组合BCD码拆成两个非组合的BCD码,然后调用INT21 的2号功能显示出来.
DATA SEGMENT
X DB 12H
ANS DB ?
ANSH DB ?
ANSL DB ?
DATA ENDS
STACK SEGMENT STACK
DB 100 DUP(?)
STACK ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA,SS:STACK
START:
MOV AX,DATA
MOV DS,AX
MOV AL,13H
ADD AL,X
MOV ANS,AL
MOV CX,4
SHR AL,CL
OR AL,30H
MOV ANSH,AL
MOV DL,ANSH
MOV AH,02H
INT 21H
MOV AL,ANS
AND AL,0FH
OR AL,30H
MOV ANSL,AL
MOV DL,ANSL
MOV AH,02H
INT 21H
MOV AX,4C00H
INT 21H
CODE ENDS
END START