26 Nov
1998
26 Nov
'98
6:49 a.m.
No LSI chips on board; only two ROM chips
(82S123N's with paper labels "LSH
1" and LSD0" typed on them) plus others are typical 74xxx-series chips (LS,
S and 7400-series) except bus I/F chips are the typical DS8641N's.
It is suspected to be SCSI as there is a 50-pin pin connector on the
ejector end and a tag on the antistatic bag has "Probably SCSI" written on
it by what is apparently a DEC dealer/reseller in Pittsburgh.
50-pin connectors might hint that it could be SCSI, but it could be
a lot of other things too. 8-inch SA800-type floppy is the most obvious.
DTC also sourced some boards which were controllers for SA1000-type
and SA4000-type hard drives.
It could be an earlier SASI type board too as the date
codes on the chips
run from mid-1982 to a few from the first weeks of 1983. IIRC, that's
around the tail end of the SASI protocol days and beginning of the SCSI
protocol.
Anyway, I need to get info on this to see if it could be used on either my
MicroVAX II or MicroPDP-11/73.
If it is a SCSI/SASI controller, it certainly isn't MSCP-emulating, which
would make it not particularly useful for a stock OS.
You can always plug it into a machine and scan the I/O page to see what address
it turns up at. This will give you a big hint as to what it emulates (if
anything!)
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927