NAME
sii —
SII SCSI adaptor
SYNOPSIS
sii* at ibus0 addr ?
scsibus* at sii?
DESCRIPTION
The
sii driver provides support for the DEC SII SCSI adaptor
ASIC used in the DECstation 2100, 3100, and 5100, and in the VAXstation 3100.
The
sii is a medium-performance implementation of the SCSI-I
common command set supporting synchronous and asynchronous SCSI devices.
The SII cabling is unusual: the bulkhead connector is very similar to a standard
submicro wide SCSI-II connector, but has the other gender.
The
sii chip only supports DMA to or from a fixed window in
memory. The driver uses this "window" area as a bounce buffer,
copying data to and from the DMA region.
SEE ALSO
cd(4),
ch(4),
pmax/pmax/ibus(4),
pmax/pmax/intro(4),
sd(4),
st(4)
HISTORY
The
sii driver first appeared in
4.4BSD.