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From: braun@m10ux.UUCP (MHx7079 mh)
Newsgroups: comp.sys.att,comp.sys.ibm.pc
Subject: Re: AT&T PC Mouse
Message-ID: <394@m10ux.UUCP>
Date: Wed, 7-Oct-87 18:52:42 EDT
Article-I.D.: m10ux.394
Posted: Wed Oct  7 18:52:42 1987
Date-Received: Sun, 11-Oct-87 01:39:18 EDT
References: <186@megatek.UUCP> <6200@oliveb.UUCP> <1521@homxc.UUCP> <8468@shemp.UCLA.EDU>
Organization: AT&T Bell Labs, Murray Hill
Lines: 37
Summary: Use any mouse with a 6300
Xref: mnetor comp.sys.att:1440 comp.sys.ibm.pc:8820

In article <8468@shemp.UCLA.EDU>, roizen@CS.UCLA.EDU writes:
> A Logitech sales rep. told me that they manufacture the AT&T mouse sold for
> 6300 and 6300+ which has 2 buttons (instead of 3 on their standard mice).
> She also told me that Logitech wouldn't sell this mouse directly to the public
> and I can purchase it only from the AT&T. What she couldn't answer though and
> I still need to know was whether the 3-button Logitech mouse (which can be 
> bought at half the price of AT&T's mouse) can be soldered to a connector that 
> plugs into the model 302 keyboard of the 6300+ machine and will it then function
> like the 2-button AT&T mouse. 

I bought a AT+T 7300 mouse at a hamfest thinking it might work with my
6300.  However, it turned out to be essentialy a serial mouse.
However, I was able to get it to work with my 6300 by
soldering a new cable to it.
  It turns out that the 6300 mouse is very simple.  The only
circuitry in it are the four LEDs and photodiodes for the ball,
and one TTL IC that debounces the switches.  There are six
output signals: One from each ball encoding photodiode,
and one from each button. (Also power and ground inputs)
   On the other hand, the serial mouse I had contained a 28-pin chip that
recieved the above signals, and send the data in serial form out on one line.
It also had a serial input, and power and ground.
   What I did to the serial mouse was to disconnect the existing cable,
and connect a 8-conductor cable to it. One wire went to each
of the aformentioned signal sources, and the other two were for power
and ground. The other end of the cable got a DB-9 connector that
mated with the keyboard socket on the 6300.  Note that the interface chip
in the mouse no longer does anything.  Also, the buttons are not
debounced, but I haven't noticed any problem.
    All you really need to know is the pinout (pinin?) of the
socket on the 6300 keyboard.  If you want to try this, mail me and
I will send it.  I don't have it in front of me now.

-- 

Doug Braun		AT+T Bell Labs, Murray Hill, NJ
m10ux!braun		201 582-7039