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From: GUBBINS@RADC-TOPS20.ARPA (Gern)
Newsgroups: net.micro.cpm
Subject: Re: Commodore 128 Mouse Interface
Message-ID: <620@brl-smoke.ARPA>
Date: Wed, 7-May-86 09:46:18 EDT
Article-I.D.: brl-smok.620
Posted: Wed May  7 09:46:18 1986
Date-Received: Fri, 9-May-86 10:32:30 EDT
Sender: news@brl-smoke.ARPA
Lines: 16

The C128 'mouse' is not a mouse at all, except it looks like one.   It
is an inverted tracball.  It is simply a digital joystick like interface.
You 'roll-up' (at ANY speed), and it lowers the UP line (pin-1).  Similarly,
for down, left, right (pins 2,3,4 respectively).   The left button is
pin-6, otherwise known as FIRE and the right button is connected in a different
fashion to POT-X (on pin-9).   There is no increments, or timming, or pulse
widths (this is what I consider makes a REAL mouse).   Tracballs work the
same way.   You can use a digital (standard) joystick in place of this
C128 mouse, or a tracball, and the software will not notice (save for no
right button).    This mouse does not even come close to the 'magic' feel
of a real mouse (Microsoft Mouse), but then again it is only $35 instead
of $85 and cheap and marginal is the name of the game in Commodore land.

Cheers,
Gern
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