5 mouse - mouse specifications
9 A serial mouse is used on the SGI 4D series, Indigo, Crimson and Onyx
10 systems. This mouse differs from other systems which use the mouse
11 described in pcmouse(7).
14 The serial data interface signal level is compatible with RS-423, which
15 has roughly a 10V swing centered about ground. The idle state and true
16 data bits for the interface are Mark level or -5V whereas false data bits
17 and the start bit are spaces or +5V. The serial data is transmitted at
18 4800 baud with one start bit, eight data bits, and no parity.
21 The mouse provides a five-byte data block whenever there is a change of
22 position or button state. The first byte is a sync byte that has its
23 upper five bits set to 10000 and its lower three bits indicating the
24 button states where a 0 indicates depression. The sync byte looks like
25 this: 10000LMR. The next four bytes contain two difference updates of
26 the mouse's change in position: X1, Y1, X2, and Y2. Positive values
27 indicate movement to the right or upward. System software ignores bytes
28 beyond the first five until reception of the next sync byte.
31 The pinout of the mouse connector on the keyboard is on the keyboard(7)
36 Indy, Indigo2, O2, OCTANE and Onyx2 use a PS/2 style mouse, which is
37 described in pcmouse(7).
41 keyboard(7), pckeyboard(7), pcmouse(7).