mouse(7)mouse(7)NAMEmouse - 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 ALSOkeyboard(7), pckeyboard(7), pcmouse(7).
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