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From: apn@nonvon.UUCP (News Administration @ nonvon crg)
Newsgroups: comp.periphs
Subject: Re: data format of the microsoft serial mouse
Message-ID: <174@nonvon.UUCP>
Date: Fri, 9-Oct-87 12:52:56 EDT
Article-I.D.: nonvon.174
Posted: Fri Oct  9 12:52:56 1987
Date-Received: Mon, 12-Oct-87 05:06:36 EDT
References: <503@vmucnam.UUCP>
Reply-To: apn@nonvon.UUCP (Alexander Paul Novickis)
Organization: nonvon systems research group
Lines: 25

In article <503@vmucnam.UUCP> daniel@vmucnam.UUCP (Daniel Lippmann) writes:
>
>can somebody explain what the data format used by the microsoft serial
>mouse ( one used on PC, with 2 clicks ) are ? what speed (1200bds) ?
>they seem simple and quite different from those of the summagraphics
>serial mouse.
>mail to: ...!seismo!mcvax!inria!vmucnam!daniel
>thanks


	byte	6	5	4	3	2	1	0
	1	1	s1	s2	y7	y6	x7	x6
	2	0	x5	x4	x3	x2	x1	x0
	3	0	y5	y4	y3	y2	y1	y0

	x0-7:	relative motion along x-axis
	y0-7:	....		      y

	frame: 1 start bit, 7 data bits, no parity bit, 1 stop bit, 1200baud

	displacements of more than +/- 128/127 are handled by multiple
	packets

	Alex P Novickis
	[Designer of Fulcrum Trackball]