$OpenBSD: gsc.4,v 1.18 2004/03/12 00:04:56 miod Exp $
Copyright (c) 1999 Michael Shalayeff
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.Dd February 17, 2017 .Dt GSC 4 hppa .Os .Sh NAME .Nm gsc .Nd General System Connect bus on .Tn HP 9000/700 machines .Sh SYNOPSIS .Cd "gsc* at lasi?" .Cd "gsc* at asp?" .Cd "gsc* at wax?" .Sh DESCRIPTION This is the core I/O bus for all HP 9000/700 workstations. All I/O subsystems connect to this bus. The devices can be either on separate chips, expansion cards or on an integrated megacell, like the LASI MBA.
p The .Tn GSC bus is a 32-bit wide, address and data multiplexed bus. In its "standard" implementation it has a maximum throughput of 160MB/s, the "2x" implementation reaches up to 250MB/s. Some HPPA CPUs directly attach to this bus, namely the PA7100LC and PA7300LC.
p As for the expansion cards, there are different form-factors, depending on bus-speed (standard or 2x) and specific models. The standard formfactor is the "EISA form-factor"; cards that look like typical EISA cards with a different connector (100-pin female EBBL). The Series 712 have their own special type of GSC expansion cards, called the "GIO form-factor", which is quite small and mostly has only one VLSI chip on it (in most cases LASI/WAX). Newer systems sometimes feature the "HSC formfactor", which is a 1U-VME card-like expansion card with a 100-pin male pin+socket connector. Mixing cards with different speeds is supported but downgrades the performance of the whole I/O-subsystem. .Sh SUPPORTED DEVICES The system includes machine-dependent .Tn GSC drivers, sorted by driver name:
p l -tag -width 12n -offset indent -compact t Xr com 4 RS-232 ports. t Xr hppa/gsckbc 4 PC-style keyboard controller. t Xr hppa/harmony 4 CS4215/AD1849 audio. t Xr hil 4 Human Interface Loop, for HP-proprietary input devices like keyboard and mice. t Xr iee 4 Intel i82596 DX/CA 32-bit LAN coprocessor. t Xr lpt 4 Centronics printer port. t Xr oosiop 4 .Tn Symbios/NCR 53C700 SCSI I/O Processor. t Xr osiop 4 .Tn Symbios/NCR 53C710 SCSI I/O Processor. .El
p Some of these .Tn GSC devices also have .Tn PCI , .Tn EISA , or .Tn ISA equivalents. These are listed in .Xr pci 4 , .Xr eisa 4 , or .Xr isa 4 . .Sh SEE ALSO .Xr hppa/asp 4 , .Xr hppa/cpu 4 , .Xr hppa/intro 4 , .Xr hppa/lasi 4 , .Xr hppa/wax 4 .Sh HISTORY The .Nm driver appeared in .Ox 2.6 . It was ported to .Nx 1.6 by Matthew Fredette.
Indexes created Mon Sep 22 10:09:38 GMT 2025