GSC(4) OpenBSD Programmer's Manual (HPPA) GSC(4)NAMEgsc - introduction to HP 9000/700 GSC bus support
SYNOPSIS
gsc* at lasi?
gsc* at asp?
gsc* at wax?
DESCRIPTION
The General System Connect (GSC) bus 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.
The 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.
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.
OpenBSD provides support for the following devices:
com(4) serial communications interface
gsckbc(4) PC-style keyboard controller
harmony(4) CS4215/AD1849 audio
hil(4) introduction to HP-HIL support
ie(4) Intel i82596 Ethernet device
lpt(4) parallel port driver
oosiop(4) Symbios/NCR 53C700 SCSI I/O Processor
osiop(4) Symbios/NCR 53C710 SCSI I/O Processor
Some of these GSC devices also have PCI, EISA, or ISA equivalents. These
are listed in pci(4), eisa(4), or isa(4).
SEE ALSOasp(4), cpu(4), intro(4), lasi(4), wax(4)HISTORY
The gsc driver appeared in OpenBSD 2.6.
OpenBSD 4.9 June 21, 2007 OpenBSD 4.9
