方波.txt

上课老师给的8086仿真器

CODE SEGMENT
ASSUME CS:CODE
DAPORT	EQU 0020H
	ORG 10a0h
START:	MOV AL,0FFH
DACON1: MOV DX,DAPORT
	OUT DX,AL
	MOV CX,0400H
DACO2:	LOOP DACO2
	NOT AL
	MOV DX,DAPORT
	OUT DX,AL
	MOV CX,0200H
DACO3:	LOOP DACO3
	JMP DACON1
CODE ENDS
END  START