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