5-1.asm

来自「微机课的全部实验」· 汇编 代码 · 共 36 行

        DATA  SEGMENT
      SEGTAB  DB        0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,98H,7FH
        DATA  ENDS
        CODE  SEGMENT
              ASSUME    DS:DATA,CS:CODE
      START:  PUSH      DS
              SUB       AX,AX
              MOV       AX,DATA
              MOV       DS,AX

              MOV       DX,28BH
              MOV       AL,89H
              OUT       DX,AL

        LOP:
              MOV       AH,08H
              INT       21H
              CMP       AL,30H
              JL        EXIT
              CMP       AL,39H
              JG        EXIT
              SUB       AL,30H
              SUB       BX,BX
              MOV       BL,AL
              MOV       AL,SEGTAB[BX]

              MOV       DX,288H
              OUT       DX, AL
              JMP       LOP


       EXIT:  RET
        CODE  ENDS
              END       START