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From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: Re: Three button mouse on a mac?
Message-ID: <1471@uw-beaver>
Date: Wed, 15-Aug-84 16:10:13 EDT
Article-I.D.: uw-beave.1471
Posted: Wed Aug 15 16:10:13 1984
Date-Received: Thu, 23-Aug-84 00:54:21 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
Lines: 24

From: Kirk Kelley  
We wish to solve this problem too.  We are currently using a little box with a 
Z80.  It is manufactured in small quantities to interface a Hawley mouse and 
chord board (for the empty hand) to the IBM PC and Zenith 100.  The box can 
change to different settings and modes by receiving instructions back from the 
PC.   For the PC the keyboard, mouse and chordboard all three plug into the box 
which then plugs directly into the keyboard port.  The Zenith was a little 
trickier since it does not have a detachable keyboard.

For the MAC there may be better ways to solve this problem, but we dont have the
inside mac documentation.  Assuming there is nothing on the mouseport inside the
mac to sense any currently unused pins, one idea is to use the existing MAC 
mouse port for coordinates and one button.  Then put the other buttons into a 
different port on the back or into the keyboard port.  There are a couple of 
things we would like to know.

   Are there four unused codes we can send to indicate the other two mouse 
   button up/down states?

   Is there some way to send info from the mac back to the keyboard port so the 
   box can set its modes? 

 -- kirk