mouse(7)

 NAME

     mouse - mouse specifications

 DESCRIPTION

     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
     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
     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
     The pinout of the mouse connector on the keyboard is on the keyboard(7)
     reference page.

 NOTE

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

 SEE ALSO

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