The DEC round mouse VSXXX-AA
Newsgroups: comp.sys.dec
Subject: Re: Ode to the DEC Round Mouse
Date: Mon, 12 Oct 1998 16:38:06 -0400
Organization: OpenVMS Engineering
Message-Id: <3622306E.6B4F7244@star.enet.dec_nospam.com>
[The mouse pin-out is...]
1 GND
2 TXD
3 RXD
4 -12v
5 +5v
6 Not Used
7 Device Present (shorted to pin 1)
Shell - protective ground
Power: +5v +/- 5% at < 150 mA
-8v to -13v at < 20 mA
Signals: RS-232 voltage-level-compatable
4800 baud, 1 stop bit. odd parity. parity ignored on incomming
data (it also ignores bit 7).
7-pin mico-DIN (male). Pin out (+ == connector key):
+
5 6 7
3 4
+1 2+
Commands:
R Select incremental stream mode
D Select prompt mode
P Request mouse position (also enters prompt mode)
T Self test, & identify
Z xx Reserved (test functions)
Data format:
7 6 5 4 3 2 1 0
-------------------------------------
1 0 0 sx sy L M R Byte 1
0 x6 x5 x4 x3 x2 x1 x0 Byte 2
0 y6 y5 y4 y3 y2 y1 y0 Byte 3
Bit 7, byte 1 - Phasing. Bit 7 always clear for byte 2 & 3
Byte DATA bits 5 & 6 always 0
sx, sy sign bits. 1= positive, 0 = negative
L, M, R - button bits, 1 = depressed
X6-X0 - X displacement
Y6-Y0 - Y displacement
Self test, and power up:
7 6 5 4 3 2 1 0
-------------------------------------
1 0 1 0 r3 r2 r1 r0 Byte 1
0 m2 m1 m0 0 0 1 0 Byte 2
0 e6 e5 e4 e3 e2 e1 e0 Byte 3
0 0 0 0 0 L M R Byte 4
Byte 1, bit 7 always set.
Byte 1 bit 6 always clear, bit 5 always set -- MOUSE connected.
R3-R0 - revision
M2-M0 - Maufacturer location code
E6-E0 - Error code
L, M, R - If byte 3 is "=" (0x3d) - button error, mask determines
which button), if byte 3 is > 0x20 other error, if byte 3 < 0x20
no error, LMR are current button state.
Thanks to Fred Kleinsorge