1.\" $OpenBSD: gsc.4,v 1.26 2007/06/21 09:43:40 jmc Exp $ 2.\" 3.\" 4.\" Copyright (c) 1999 Michael Shalayeff 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd $Mdocdate: June 21 2007 $ 28.Dt GSC 4 hppa 29.Os 30.Sh NAME 31.Nm gsc 32.Nd introduction to HP 9000/700 GSC bus support 33.Sh SYNOPSIS 34.Cd "gsc* at lasi?" 35.Cd "gsc* at asp?" 36.Cd "gsc* at wax?" 37.Sh DESCRIPTION 38The General System Connect (GSC) bus 39is the core I/O bus for all HP 9000/700 workstations. 40All I/O subsystems connect to this bus. 41The devices can be either on separate chips, expansion 42cards or on an integrated megacell, like the LASI MBA. 43.Pp 44The 45.Tn GSC 46bus is a 32-bit wide, address and data multiplexed bus. 47In its "standard" implementation it has a maximum throughput of 160MB/s, 48the "2x" implementation reaches up to 250MB/s. 49Some HPPA CPUs directly attach to this bus, namely the PA7100LC and PA7300LC. 50.Pp 51As for the expansion cards, there are different form-factors, depending on 52bus-speed (standard or 2x) and specific models. 53The standard formfactor is the "EISA form-factor"; cards that look like 54typical EISA cards with a different connector (100-pin female EBBL). 55The Series 712 have their own special type 56of GSC expansion cards, called the "GIO form-factor", which is quite small and 57mostly has only one VLSI chip on it (in most cases LASI/WAX). 58Newer systems sometimes feature the "HSC formfactor", which is a 1U-VME 59card-like expansion card with a 100-pin male pin+socket connector. 60Mixing cards with different speeds is supported but downgrades 61the performance of the whole I/O-subsystem. 62.Pp 63.Ox 64provides support for the following devices: 65.Pp 66.Bl -tag -width 12n -offset indent -compact 67.It Xr com 4 68serial communications interface 69.It Xr gsckbc 4 70PC-style keyboard controller 71.It Xr harmony 4 72CS4215/AD1849 audio 73.It Xr hil 4 74introduction to HP-HIL support 75.It Xr ie 4 76Intel i82596 Ethernet device 77.It Xr lpt 4 78parallel port driver 79.It Xr oosiop 4 80.Tn Symbios/NCR 8153C700 SCSI I/O Processor 82.It Xr osiop 4 83.Tn Symbios/NCR 8453C710 SCSI I/O Processor 85.El 86.Pp 87Some of these 88.Tn GSC 89devices also have 90.Tn PCI , 91.Tn EISA , 92or 93.Tn ISA 94equivalents. 95These are listed in 96.Xr pci 4 , 97.Xr eisa 4 , 98or 99.Xr isa 4 . 100.Sh SEE ALSO 101.Xr asp 4 , 102.Xr cpu 4 , 103.Xr intro 4 , 104.Xr lasi 4 , 105.Xr wax 4 106.Sh HISTORY 107The 108.Nm 109driver 110appeared in 111.Ox 2.6 . 112