> Just interested, since I'm real busy at the moment, but; If we were to
> take asc.c from Alpha (which uses the MI ncr53c9x and scsipi stuff) and do
> the needed hacking, what are the chances of it working?
>
> Also, what are the advantages - CD support, better performance??

MI SCSI driver for DECstations has been under development and in use
on developers machines.  The advantage is consistency across other
NetBSD ports which use MI SCSI.  Caveats for NetBSD/pmax are;

   [1] SII SCSI chip on DECstation 3100 has not been going well.
   [2] MI NCR53C94 driver for IOASIC DECstations still needs bugfix
       (shutdown/halt sometimes fail to complete buf-cache flushing).

My Personal DECstations has now total 4 channel SCSI buses
"scsibus[0-3]" w/ IOASIC SCSI, PMAZ-A and TCDS, but I have not
addressed quality and reliability issues, yet.

...
asc0 at ioasic0 offset 0x300000: NCR53C94, 25MHz, SCSI ID 7
scsibus0 at asc0: 8 targets, 8 luns per target
probe(asc0:2:0): max sync rate 5.00Mb/s
sd0 at scsibus0 targ 2 lun 0: <nEC, D3845, > SCSI2 0/direct fixed
sd0: 1032MB, 2097 cyl, 16 head, 63 sec, 512 bytes/sect x 2113776 sectors
xcfb0 at tc0 slot 2 offset 0x0: 1024 x 768, 8bpp
wsdisplay0 at xcfb0: console (std, dumb emulation)
asc1 at tc0 slot 1 offset 0x0: NCR53C94, 12MHz, SCSI ID 7
scsibus1 at asc1: 8 targets, 8 luns per target
tcds0 at tc0 slot 0 offset 0x0: TurboChannel Dual SCSI
asc2 at tcds0 chip 0: NCR53C96, 25MHz, SCSI ID 7
scsibus2 at asc2: 8 targets, 8 luns per target
probe(asc2:2:0): max sync rate 5.00Mb/s
sd1 at scsibus2 targ 2 lun 0: <SEAGATE, ST32430N, 0300> SCSI2 0/direct fixed
sd1: 2047MB, 3992 cyl, 9 head, 116 sec, 512 bytes/sect x 4193415 sectors
asc3 at tcds0 chip 1: NCR53C96, 25MHz, SCSI ID 7
scsibus3 at asc3: 8 targets, 8 luns per target
boot configuration: via SCSI, slot 3, unit 2, part 0: boot device: sd0
biomask e1220 netmask e1320 ttymask e1361
...

Tohru Nishimura
Nara Institute of Science and Technology