a11-1.asm

汇编语言的设计

STACK SEGMENT STACK
	DW 64 DUP(?)
STACK ENDS

CODE SEGMENT
	ASSUME CS:CODE

START:	IN AL,21H
	AND AL,7FH
	OUT 21H,AL
	MOV AL,90H
	OUT 43H,AL
A1:	MOV AL,05H
	OUT 42H,AL
	HLT
	STI
	JMP A1
	MOV AX,014DH
	INT 10H
	MOV AX,0120H
	INT 10H
	MOV AL,20H
	OUT 20H,AL
	IRET	
CODE ENDS
     END START