z0.asm

8253a计数器-定时器接口原理试验,计算机接口相关

STACK   SEGMENT         PARA    STACK
        DW              100H DUP(?)
STACK   ENDS
DATA    SEGMENT         PARA
DATA    ENDS
CODE    SEGMENT         PARA
        ASSUME          CS:CODE,DS:DATA,SS:STACK
MAIN    PROC    FAR
        MOV     AX,DATA
        MOV     DS,AX
        MOV     DX,303H
        MOV     AL,00110000B
        OUT     DX,AL
        MOV     DX,300H
        MOV     AX,0FFFFH
        OUT     DX,AL
        MOV     AL,AH
        OUT     DX,AL
        MOV     AX,4C00H
        INT     21H
MAIN    ENDP
CODE    ENDS
        END     MAIN