1.\" $NetBSD: gsc.4,v 1.2 2017/02/17 22:24:46 christos Exp $ 2.\" 3.\" $OpenBSD: gsc.4,v 1.18 2004/03/12 00:04:56 miod Exp $ 4.\" 5.\" 6.\" Copyright (c) 1999 Michael Shalayeff 7.\" All rights reserved. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.Dd February 17, 2017 30.Dt GSC 4 hppa 31.Os 32.Sh NAME 33.Nm gsc 34.Nd General System Connect bus on 35.Tn HP 9000/700 36machines 37.Sh SYNOPSIS 38.Cd "gsc* at lasi?" 39.Cd "gsc* at asp?" 40.Cd "gsc* at wax?" 41.Sh DESCRIPTION 42This is the core I/O bus for all HP 9000/700 workstations. 43All I/O subsystems connect to this bus. 44The devices can be either on separate chips, expansion 45cards or on an integrated megacell, like the LASI MBA. 46.Pp 47The 48.Tn GSC 49bus is a 32-bit wide, address and data multiplexed bus. 50In its "standard" implementation it has a maximum throughput of 160MB/s, 51the "2x" implementation reaches up to 250MB/s. 52Some HPPA CPUs directly attach to this bus, namely the PA7100LC and PA7300LC. 53.Pp 54As for the expansion cards, there are different form-factors, depending on 55bus-speed (standard or 2x) and specific models. 56The standard formfactor is the "EISA form-factor"; cards that look like 57typical EISA cards with a different connector (100-pin female EBBL). 58The Series 712 have their own special type 59of GSC expansion cards, called the "GIO form-factor", which is quite small and 60mostly has only one VLSI chip on it (in most cases LASI/WAX). 61Newer systems sometimes feature the "HSC formfactor", which is a 1U-VME 62card-like expansion card with a 100-pin male pin+socket connector. 63Mixing cards with different speeds is supported but downgrades 64the performance of the whole I/O-subsystem. 65.Sh SUPPORTED DEVICES 66The system includes machine-dependent 67.Tn GSC 68drivers, sorted by driver name: 69.Pp 70.Bl -tag -width 12n -offset indent -compact 71.It Xr com 4 72RS-232 ports. 73.It Xr hppa/gsckbc 4 74PC-style keyboard controller. 75.It Xr hppa/harmony 4 76CS4215/AD1849 audio. 77.It Xr hil 4 78Human Interface Loop, for HP-proprietary input devices like keyboard and mice. 79.It Xr iee 4 80Intel i82596 DX/CA 32-bit LAN coprocessor. 81.It Xr lpt 4 82Centronics printer port. 83.It Xr oosiop 4 84.Tn Symbios/NCR 8553C700 SCSI I/O Processor. 86.It Xr osiop 4 87.Tn Symbios/NCR 8853C710 SCSI I/O Processor. 89.El 90.Pp 91Some of these 92.Tn GSC 93devices also have 94.Tn PCI , 95.Tn EISA , 96or 97.Tn ISA 98equivalents. 99These are listed in 100.Xr pci 4 , 101.Xr eisa 4 , 102or 103.Xr isa 4 . 104.Sh SEE ALSO 105.Xr hppa/asp 4 , 106.Xr hppa/cpu 4 , 107.Xr hppa/intro 4 , 108.Xr hppa/lasi 4 , 109.Xr hppa/wax 4 110.Sh HISTORY 111The 112.Nm 113driver 114appeared in 115.Ox 2.6 . 116It was ported to 117.Nx 1.6 118by Matthew Fredette. 119