a9-3.asm

汇编语言的设计

STACK SEGMENT STACK
	DW 64 DUP(?)
STACK ENDS

CODE SEGMENT
	ASSUME CS:CODE

START:  CLI
	MOV AL,11H
	OUT 20H,AL
	MOV AL,08H
	OUT 21H,AL
	MOV AL,80H
	OUT 21H,AL
	MOV AL,1DH
	OUT 21H,AL
	MOV AL,7DH
	OUT 21H,AL
	MOV AL,11H
	OUT 00H,AL
	MOV AL,30H
	OUT 01H,AL
	MOV AL,07H
	OUT 01H,AL
	MOV AL,09H
	OUT 01H,AL
	MOV AL,7FH
	OUT 01H,AL
	PUSH DS
	MOV AX,0000H
	MOV DS,AX
	MOV AX,OFFSET IRQ7
	ADD AX,2000H
	MOV SI,00DCH
	MOV [SI],AX
	MOV AX,0000H
	MOV SI,00DEH
	MOV [SI],AX
	POP DS
A1:	STI
	HLT
	JMP A1
IRQ7:  	MOV AX,0137H
	INT 10H
	MOV AX,0120H
	INT 10H
	MOV AL,20H
	OUT 00H,AL
	OUT 00H,AL
	IRET
CODE	ENDS
	END START