1 .\" $NetBSD: gsc.4,v 1.1 2004/09/22 16:38:26 jkunz Exp $
3 .\" $OpenBSD: gsc.4,v 1.18 2004/03/12 00:04:56 miod Exp $
6 .\" Copyright (c) 1999 Michael Shalayeff
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34 .Nd General System Connect bus on
42 This is the core I/O bus for all HP 9000/700 workstations.
43 All I/O subsystems connect to this bus.
44 The devices can be either on separate chips, expansion
45 cards or on an integrated megacell, like the LASI MBA.
49 bus is a 32-bit wide, address and data multiplexed bus.
50 In its "standard" implementation it has a maximum throughput of 160MB/s,
51 the "2x" implementation reaches up to 250MB/s.
52 Some HPPA CPUs directly attach to this bus, namely the PA7100LC and PA7300LC.
54 As for the expansion cards, there are different form-factors, depending on
55 bus-speed (standard or 2x) and specific models.
56 The standard formfactor is the "EISA form-factor"; cards that look like
57 typical EISA cards with a different connector (100-pin female EBBL).
58 The Series 712 have their own special type
59 of GSC expansion cards, called the "GIO form-factor", which is quite small and
60 mostly has only one VLSI chip on it (in most cases LASI/WAX).
61 Newer systems sometimes feature the "HSC formfactor", which is a 1U-VME
62 card-like expansion card with a 100-pin male pin+socket connector.
63 Mixing cards with different speeds is supported but downgrades
64 the performance of the whole I/O-subsystem.
66 The system includes machine-dependent
68 drivers, sorted by driver name:
70 .Bl -tag -width 12n -offset indent -compact
74 PC-style keyboard controller.
78 Human Interface Loop, for HP-proprietary input devices like keyboard and mice.
80 Intel i82596 DX/CA 32-bit LAN coprocessor.
82 Centronics printer port.
85 53C700 SCSI I/O Processor.
88 53C710 SCSI I/O Processor.