Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!ucsd!ucrmath!rhyde
From: rhyde@ucrmath.ucr.edu (randy hyde)
Newsgroups: comp.sys.apple2
Subject: Re: Multitasking on a II
Message-ID: <10734@ucrmath.ucr.edu>
Date: 21 Dec 90 07:01:18 GMT
References: <11297.apple.net@pro-angmar> <1990Dec16.073531.1483@nntp-server.caltech.edu> <5833@mint17.UUCP>
Organization: University of California, Riverside
Lines: 14

INC/DEC cannot be used as test and set instructions.  However, ASL/LSR
can.

Consider:

	asl flag
	bcc inuse
	<critical region>
	lda #1
	sta flag
	<end of critical region>

works like a charm.
*** RAndy Hyde