Newsgroups: comp.sys.acorn
Path: utzoo!utgpu!watserv1!watdragon!rose!ccplumb
From: ccplumb@rose.uwaterloo.ca (Colin Plumb)
Subject: Re: Archimedes keyboard
Message-ID: <1991Feb27.004015.6730@watdragon.waterloo.edu>
Sender: daemon@watdragon.waterloo.edu (Owner of Many System Processes)
Organization: University of Waterloo
References: <$0`&80+@warwick.ac.uk> <1991Feb23.211436.7855@vax1.tcd.ie> <1991Feb25.161054.6477@cl.cam.ac.uk> <8729@castle.ed.ac.uk>
Date: Wed, 27 Feb 1991 00:40:15 GMT
Lines: 9

Someone at Xerox made an even more interesting mouse... it was also optical,
but a 2-d array of sensors followed a pattern below.  It was normally
run on a triangular dot grid (you could always photocopy something in
extremis), but it also worked very well on blue jeans, or a sufficiently
grungy desk.

The whole thing was one chip, installed in a glass-topped case.
-- 
	-Colin