t3-7.asm

上课时老师讲的一些经典的例子；错过了就太可惜了呀

DATA SEGMENT
XX    DB 4
ASCII DB ?
DATA ENDS


CODE SEGMENT
     ASSUME CS:CODE,DS:DATA

START:MOV AX,DATA
      MOV DS,AX
      MOV AL,XX
      AND AL,0FH
      CMP AL,9
      JA LAB1
      ADD AL,30H
      JMP LAB2
LAB1: ADD AL,37H
LAB2: MOV ASCII,AL
      MOV AH,4CH
      INT 21H
CODE  ENDS
      END START