Xref: utzoo comp.sys.amiga:25001 comp.sys.amiga.tech:2362
Path: utzoo!utgpu!attcan!uunet!sco!brianm
From: brianm@sco.COM (Brian Moffet)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: Amiga Mouse info needed
Keywords: Amiga Mouse Info Pinouts
Message-ID: <1654@scolex>
Date: 7 Nov 88 18:03:30 GMT
References: <7804@bloom-beacon.MIT.EDU>
Reply-To: brianm@sco.COM (Brian Moffet)
Organization: The Santa Cruz Operation, Inc.
Lines: 47

In article <7804@bloom-beacon.MIT.EDU> rlcarr@athena.mit.edu (Rich Carreiro) writes:
>I (and my partner) will be eternally grateful for any information we get
>(after all, you wouldn't want us to use a Mac mouse 8-)
>

Actually, a little while ago, I took my amiga mouse apart and
went at it with some simple electronics equipment.  I guess
that is what you get when you get board of programing :-)

Anyway, I found that the amiga mouse is what is called an
opto-mechanical mouse.  What this means is that when you move
the mouse, it will rotate 2 wheels inside the mouse.  The wheels
have an *odd* number of holes in them.  These holes allow
a small light to shine on a photo-diode and generate a voltage,
+5 I believe, to either the "normal" or "quadrature" pin.

How this works is:   The "normal" pin is volted high, and the
when you continue to move the mouse, the "normal" is dragged low
and the "quadrature" is dragged high.  the electronics in the
machine can now tell which direction the mouse is moving.
for example (I think this is in the positive direction, I am
not at my machine with my notes)

	      _________	     _________      _________
quad	______|       |______|       |______|       |

	_______        _______      _________
normal	|     |________|     |______|       |______

This applies for the vertical and horizontal.  Also, the
amiga mouse will send 2 of 3 mouse buttons  1 & 3.
It does not send a signal for the middle button.

I posted this because I thought more than 1 person might
be interested.   As soon as I get married (* in january *)
perhaps I'll make a public domain track-ball.  That was why
I did this in the first place.

Oh, yes, I have been called a hacker. :-)

brian

-- 
Brian Moffet			{uunet,decvax!microsoft,ucscc}!sco!brianm
 -or-				...sco!alar!brian
"Evil Geniuses for a better tomoorow!"  My fish and company have policies.
					I have opinions.