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From: info-mac@uw-beaver
Newsgroups: fa.info-mac
Subject: Re:  Sprite troubles.
Message-ID: <130@uw-beaver>
Date: Fri, 7-Dec-84 20:11:08 EST
Article-I.D.: uw-beave.130
Posted: Fri Dec  7 20:11:08 1984
Date-Received: Mon, 10-Dec-84 02:35:42 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 10

From: winkler@harvard.ARPA (Dan Winkler)

> Anyway I can tell that MacPaint
> manages to copybits the entire Paint window in the retrace time,

I don't think that's true.  As I recall from what Bill said, he uses
both video buffers and only manages to switch between them in the
retrace time.  He also keeps yet another (third) copy of the screen to
allow undo.  So the MacPaint code is squeezed into even less memory
than you might think.