gsc(4) - NetBSD Manual Pages

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GSC(4)               NetBSD/hp700 Kernel Interfaces Manual              GSC(4)


NAME

     gsc -- General System Connect bus on HP 9000/700 machines


SYNOPSIS

     gsc* at lasi?
     gsc* at asp?
     gsc* at wax?


DESCRIPTION

     This is the core I/O bus for all HP 9000/700 workstations.  All I/O sub-
     systems 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 formfac-
     tor 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-fac-
     tor", which is quite small and mostly has only one VLSI chip on it (in
     most cases LASI/WAX).  Newer systems sometimes feature the "HSC formfac-
     tor", 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.


SUPPORTED DEVICES

     The system includes machine-dependent GSC drivers, sorted by driver name:

           com(4)        RS-232 ports.
           gsckbc(4)     PC-style keyboard controller.
           harmony(4)    CS4215/AD1849 audio.
           hil(4)        Human Interface Loop, for HP-proprietary input
                         devices like keyboard and mice.
           iee(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).


SEE ALSO

     asp(4), cpu(4), intro(4), lasi(4), wax(4)


HISTORY

     The gsc driver appeared in OpenBSD 2.6.  It was ported to NetBSD 1.6 by
     Matthew Fredette.

NetBSD 6.0.3                     April 4, 1999                    NetBSD 6.0.3