On June 4, you wrote:
> DSSI != SCSI.  even though the same chip is used in DECstation 3100,
> the wiring is completely different than SCSI.  
> 
> The SII chip is a difficult chip to program.  (or so the persons who
> did the support for under ULTRIX told me).

  There is some fairly detailed documentation on the SII chip in the
DECstation 3100 functional spec.  I don't know if it's SCSI-specific,
but it might help.

  You can find a copy at ftp://ftp.neurotica.com:/pub/doc/DS3100.ps.gz.


              -Dave