gsc - General System Connect bus on HP 9000/700 machines
gsc* at lasi?
gsc* at asp?
gsc* at wax?
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
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
"2x" implementation reaches up to 250MB/s. Some HPPA CPUs
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
is the "EISA form-factor"; cards that look like typical
with a different connector (100-pin female EBBL). The Series 712 have
their own special type of GSC expansion cards, called the
which is quite small and mostly has only one VLSI chip
on it (in
most cases LASI/WAX). Newer systems sometimes feature the
which is a 1U-VME card-like expansion card with a
pin+socket connector. Mixing cards with different speeds is
but downgrades the performance of the whole I/O-subsystem.
The system includes machine-dependent GSC drivers, sorted by
com(4) RS-232 ports.
gsckbc(4) PC-style keyboard controller.
harmony(4) CS4215/AD1849 audio.
hil(4) Human Interface Loop, for HP-proprietary
like keyboard and mice.
ie(4) Intel i82596 DX/CA 32-bit LAN coprocessor.
lpt(4) Centronics printer port.
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),
asp(4), cpu(4), intro(4), lasi(4), wax(4)
The gsc driver appeared in OpenBSD 2.6.
OpenBSD 3.6 April 4, 1999
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