7-1.asm

微机课的全部实验

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

              MOV       DX,290H
       LOP1:  MOV       DI,50
              MOV       AL,0
        LOP:
              OUT       DX,AL
              ADD       AL,5
              DEC       DI
              JNZ       LOP
      ;BEGIN:  MOV       AH,0BH
          ;    INT       21H
          ;    CMP       AL,00H
          ;    JZ        EXIT
              JMP       LOP1
       EXIT:  RET
        CODE  ENDS
              END       START