vt1200/reference/keyboard-mouse/vaxarchive-vsxxx.html

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			<h3 class="muted"><img src="../vaxarch.gif"/></h3>
			<a href="https://github.com/teverett/vaxarchive"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/e7bbb0521b397edbd5fe43e7f760759336b5e05f/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677265656e5f3030373230302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png"></a>
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		<h3>The DEC round mouse VSXXX-AA</h3>
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	<pre>
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.
</pre>
<p>Thanks to Fred Kleinsorge <kleinsorge@star.enet.dec_nospam.com></p>

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