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From: braun@m10ux.UUCP (MHx7079 mh)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Logitech's Mouse with Plus Software !
Message-ID: <224@m10ux.UUCP>
Date: Tue, 30-Jun-87 18:36:09 EDT
Article-I.D.: m10ux.224
Posted: Tue Jun 30 18:36:09 1987
Date-Received: Thu, 2-Jul-87 01:34:21 EDT
References: <822@puff.WISC.EDU> <1731@nicmad.UUCP> <1666@uwmacc.UUCP> <1735@nicmad.UUCP>
Distribution: na
Organization: AT&T Bell Labs, Murray Hill
Lines: 26
Keywords: Serial mouse (was: Need info on it !)
Summary: How does a serial mouse work?

I just came across a surplus AT+T PC7300 mouse, which is made by Logitech.
I am trying to figure out how to modify it to be a general-purpose serial mouse.
The cord has 5 wires: power, ground, shield, data input, and data output.
(These were deduced by examination of the circuitry).
When power is applied (5 volts), the output line emits a click
after a second or so, and is then silent.
Does anyone know what the data protocol and commands (and baud rate)
are for a Logitech serial mouse?
I assume that if I send it the right command byte(s) at the right baud rate
(and signal levels), it will come alive, and send a continous stream
of position data, and button events.

By the way, the inside contains the ball and position sensors, the switches,
a 28-pin DIP IC, a crystal, 2 transistors (the input and output drivers),
and a few resistors and caps.

Any references to magazine articles, etc., would also be handy.



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

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