Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wasatch!uplherc!esunix!blgardne
From: blgardne@esunix.UUCP (Blaine Gardner)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Joystick Port Question
Message-ID: <1388@esunix.UUCP>
Date: 19 Jul 89 13:38:04 GMT
References: <7991@cs.Buffalo.EDU>
Organization: Evans & Sutherland Computer Corporation
Lines: 51

From article <7991@cs.Buffalo.EDU>, by uggbrand@cs.Buffalo.EDU (G. Brandon Brooks):
> 	I am trying to design a program that would allow the Atari ST
> mouse to work with my Amiga. My friend has an extra Atari mouse and my Amiga
> mouse is dead, so it would be a lot cheaper to use his extra ST mouse.
> 	I tried intercepting the signals from the gameport device using
> GPCTRelJoystick and GPCTMouse, but those don't seem to give all the values
> that I need. What I really want to be able to do is to read in the values
> of all 9 pins (or whatever ones the Amiga can read). Is there a way to do
> this that anyone can help me with?

Personally I'd recommend doing it in hardware, but then I'm a tech, not
a programmer. Here's the pinouts of the Amiga and ST mice.

========================================================================
Referring to my trackball -> mouse hack George Robbins (cbmvax!grr) says:

The original article in comp.sys.amiga describes how to convert WICO
and Atari 2600 track balls to work with the Amiga.  Converting for the
Atari ST is essentially the same, except for some disagreement between
Atari and CBM on which quadrature signals go to which "joystick" lines.

Pin	Amiga			Atari
===	=====			=====
1	Vertical		X-B
2	Horizontal		X-A
3	Vertical-Quatrature	Y-A
4	Horizontal-Quadrature	Y-B
5	Pot X			N.C.
6	Left Button		Left Button
7	+5V			+5V	
8	Ground			Ground
9	Pot Y-Right Button	Right Button

As you can see, the pin-outs are compatible enough that no harm will result
if the two are interchanged, however since the quadrature outputs don't
match up you will get pointless twitching instead of useful motion.  Simply
switch the wires going to pins 1 thru 4 until you get it right.
===========================================================================

Also, if you're interested, I've got a collection of 4 or 5 trackball to
mouse hacks. One for the Wico trackball, and the rest for the Atari 2600
trackball. It's been a while since I've posted it here, but I just
posted to comp.sys.atari.st since someone over there was asking about
the subject.

Maybe I should send it to Bob Page so it will get archived?
-- 
Blaine Gardner @ Evans & Sutherland    580 Arapeen Drive, SLC, Utah 84108
Here: utah-cs!esunix!blgardne   {ucbvax,allegra,decvax}!decwrl!esunix!blgardne
There: uunet!iconsys!caeco!i-core!worsel!blaine  (My Amiga running uucp)
"Nobody will ever need more than 64K."    "Nobody needs multitasking on a PC."