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- CODE SEGMENT
- ASSUME CS:CODE
- MAIN: MOV AX,CS
- MOV DX,AX
- MOV AL,36H ;初始化计数器0,设定 工作方式为方式3
- MOV DX,283H ;283H 为8253的地址
- OUT DX,AL ;
- MOV AX,1000 ;计数器0的计数初值为1000
- MOV DX,280H ;280H 为计数器0的地址
- OUT DX,AL ;先输出低四位
- MOV AH,AL ;再输出高四位
- OUT DX,AL
- MOV AL,76H ;初始化计数器1,设定工作方式为方式3
- MOV DX,283H ;
- OUT DX,AL ;
- MOV AX,1000 ;计数器1的计数初值为1000
- MOV DX,281H ;计数器1的地址
- OUT DX,AL
- MOV AL,AH
- OUT DX,AL
- MOV AH,40H ;结束返回DOS
- INT 21H
- CODE ENDS
- END MAIN
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