Path: utzoo!attcan!uunet!cs.utexas.edu!usc!ucsd!ucbvax!pasteur!agate!shelby!med!hanauma!rick
From: rick@hanauma.stanford.edu (Richard Ottolini)
Newsgroups: comp.graphics
Subject: Re: More on the Patent question....
Keywords: Cadtrak patent XOR split-screen
Message-ID: <1780@med.Stanford.EDU>
Date: 18 Jul 90 15:52:40 GMT
References: <646@dg.dg.com\
Sender: news@med (USENET News System)
Organization: Stanford University, Department of Geophysics
Lines: 10

In article <646@dg.dg.com\ mpogue@dg.dg.com writes:
\  Here's what Cadtrak is claiming they invented:
\1) XOR of the frame buffer.  Any hardware that accesses a frame
\2) Hardware PAN.  Any hardware that allows you to change a pointer,
\3) Hardware split screen.  Any hardware that allows you to specify
\4) Double buffering.  Any hardware that provides for two virtual buffers,
\5) Hardware ZOOM, using pixel replication.  Any hardware that permits

Our Sun technical contacts in 1985 and 1986, when Sun was a smaller,
always claimed they never implemented these features for patent reasons.