3-1.asm

微机课的全部实验

        DATA  SEGMENT
        DATA  ENDS
        CODE  SEGMENT
              ASSUME    DS:DATA,CS:CODE
      START:
              PUSH      DS
              SUB       AX,AX
              PUSH      AX
              MOV       AX,DATA
              MOV       DS,AX

              MOV       DX,283H
              MOV       AL,10H
              OUT       DX,AL
              MOV       DX,280H
              MOV       AL,0FH
              OUT       DX,AL

       READ:  MOV       DX,280H
              IN        AL,DX
              MOV       DL,AL
              CMP       DL,09H
              JA        A1
              ADD       DL,30H
              JMP       PRINT
         A1:
              SUB       DL,0AH
              ADD       DL,41H

      PRINT:

              MOV       AH,02
              INT       21H


              MOV       AH,0BH
              INT       21H
              CMP       AL,00H
              JZ        READ



              RET


        CODE  ENDS
              END       START