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mouse(7)							      mouse(7)

NAME    [Toc]    [Back]

     mouse - mouse specifications

DESCRIPTION    [Toc]    [Back]

     A serial mouse is used on the SGI 4D series, Indigo, Crimson and Onyx
     systems.  This mouse differs from other systems which use the mouse
     described in pcmouse(7).

   Signals    [Toc]    [Back]
     The serial	data interface signal level is compatible with RS-423, which
     has roughly a 10V swing centered about ground.  The idle state and	true
     data bits for the interface are Mark level	or -5V whereas false data bits
     and the start bit are spaces or +5V.  The serial data is transmitted at
     4800 baud with one	start bit, eight data bits, and	no parity.

   Protocol    [Toc]    [Back]
     The mouse provides	a five-byte data block whenever	there is a change of
     position or button	state.	The first byte is a sync byte that has its
     upper five	bits set to 10000 and its lower	three bits indicating the
     button states where a 0 indicates depression.  The	sync byte looks	like
     this: 10000LMR.  The next four bytes contain two difference updates of
     the mouse's change	in position: X1, Y1, X2, and Y2.  Positive values
     indicate movement to the right or upward.	System software	ignores	bytes
     beyond the	first five until reception of the next sync byte.

   Pinout    [Toc]    [Back]
     The pinout	of the mouse connector on the keyboard is on the keyboard(7)
     reference page.

NOTE    [Toc]    [Back]

     Indy, Indigo2, O2,	OCTANE and Onyx2 use a PS/2 style mouse, which is
     described in pcmouse(7).

SEE ALSO    [Toc]    [Back]

     keyboard(7), pckeyboard(7), pcmouse(7).

									PPPPaaaaggggeeee 1111
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