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From: pes@bath63.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: mouses
Message-ID: <777@bath63.ux63.bath.ac.uk>
Date: Mon, 16-Feb-87 05:38:33 EST
Article-I.D.: bath63.777
Posted: Mon Feb 16 05:38:33 1987
Date-Received: Wed, 18-Feb-87 19:46:31 EST
References: <8701270401.AA02677@ucbvax.Berkeley.EDU> <747@bath63.ux63.bath.ac.uk> <1486@megaron.arizona.edu> <773@bath63.ux63.bath.ac.uk>
Reply-To: pes@ux63.bath.ac.uk (Paul Smee)
Organization: AUCC c/o University of Bath
Lines: 10


The unaccounted-for chip came to me in a dream.  It's not relevant to the
conversion of the Atari trakball to look like a mouse, but (working from
memory) just to make the 'how it works when you buy it' bit complete --

The chip I couldn't remember what was is a twin mono-stable (one-shot).
Its function in life is to 'kill' the output of the joystick 'D latch'
if the ball stops moving in the appropriate direction -- so logically
'centering' the simulated joystick.  As I recall it is triggered from
one of the buffered pulse trains.