21 Nov
2002
21 Nov
'02
7:33 p.m.
John Lawson wrote:
I have managed to latch on to one of the above
cards... the sticker
on
one chip says its a Model CDU-720/TM (sn 2127 BOYA8) and two ROMS have
F720Y1A8 and 2A8 respectively. Board copyright is 1989 (in copper) and
the silkscreening says 1991 - most of the chips are from '91. It is
single-ended only; the differential section is not populated.
Nice find! Since it's a /TM, it can talk to both tapes and disks. It
needs to be configured for one CSR address for MSCP, and another for
TMSCP.
I have yet to do any Googling, but if anyone has
anything on this...
http://www.brouhaha.com/~eric/retrocomputing/cmd/cdu-722.txt
I
know a nice friendly 11/44 system (sitting to my immediate left) that
would dearly love to be able to read CDROMS, SCSI disks, etc....
CD-ROM drives will probably have to be jumpered for 512-byte sectors
(vs. the standard 2048). Many Toshiba and Plextor SCSI drives have
such a setting.