SII(4)                OpenBSD Programmer's Manual (PMAX)                SII(4)

NAME
     sii - SII scsi adaptor

SYNOPSIS
     sii0 at mainbus

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 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 sup-
     ports DMA to or from a fixed window in memory.  The driver use this area
     as a bounce buffer,  copying data to and from the  DMA region.

SEE ALSO
     cd(4), ch(4), intro(4), rz(4), sd(4), st(4), tz(4)

HISTORY
     The sii driver first appeared in 4.4BSD.

BUGS
     The sii driver only supports the oldscsibus higher-level layer, and the
     rz and tz devices, which first appeared in 4.4BSD/pmax. It should be  re-
     written to support the scsibus machine-independent higher-level SCSI lay-
     er and the sd, st, and cd drivers. This is currently under development.




OpenBSD 2.9                     August 6, 1996                               1
