Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!sdcsvax!ucsdhub!hp-sdd!hplabs!hpda!hpcuhb!hpindda!carlson
From: carlson@hpindda.HP.COM (Bob Carlson)
Newsgroups: comp.sys.mac
Subject: Re: Inverse video/text
Message-ID: <40260013@hpindda.HP.COM>
Date: 3 Apr 89 16:39:48 GMT
References: <5894@pdn.paradyne.com>
Organization: HP Information Networks, Cupertino, CA
Lines: 5

In about 1973 someone taught me the trick of XOR A,B XOR B,A XOR A,B
in order to do a swap.  It's hardly a new idea, nor is it limited to 
graphics.

Cheers