12 Dec
2002
12 Dec
'02
8:45 p.m.
However, PLEASE ask someone who knows about the
PDP-11/20
if the Unibus backplane can take the UC17!!! The Unibus backplane
sometimes had "interesting" aspects for early models.
Technically speaking, the UC17 doesn't plug into Unibus, but rather
into an SPC slot. A stock 11/20 doesn't have any SPC slots. I don't
think you can install a DD11-C or DD11-D backplane into the 11/20 box
due to the old-style power distribution, but if you run a Unibus cable
to a separate BA11 box with a DD11 backplane, I can't imagine any
reason why the UC17 shouldn't work in it.
In any case, even if there was something funny about the 11/20 Unibus
timing, plugging a UC17 into a DD11-C or -D backplane shouldn't hurt the
UC17 unless there are serious problems with the BA11's power supply.