Hi Richard,
On Tue, 23 Jan 2001, Richard W. Schauer wrote:
Hi everybody-
I just recently acquired a whole bunch of stuff out of a company's
basement, including a VAX-11/780, VAX-11/750, 4 RA81's, a TU80, a
pdp-11/44, 4 RL02's, an RP06, a TS11, and spare parts and printsets
galore.
Lucky B******D... Nobody in denver has a basement full of neat stuff
like that... cept Will... (haven't forgotten the 11/34 printset yet)
(Yes, John Foust, the little pdp-11/44 in Milwaukee
led to all
that.) All the equipment was brought up a flight of carpeted stairs by a
refrigerator dolly and human power, except the RP06 and the 780 where we
used a come-along and a lifting frame I made. Heavy!
Cool... I'm planning on moving my '780 into the basement with the same
concept...
Anyway, the 780 needs a floppy to boot. The previous
owner says he
doesn't have it, and I can't find it (although I'm not done searching
yet).
I have at least one (in the machine), but it may be bad... I bought one
from ebay, but again, it may be bad... I need a quick
way to hook an
8" floppy up to a running computer to read it...
Anyone know if I can plug an RX01 drive & QBus controller into a uVAX II?
Is this the sort of thing that is generically
available, on the WWW
for instance, or is it something that is built up specifically for the mix
of options I have in the machine?
I haven't found anyplace yet, and once my toilet stops leaking (long
story), I'll be putting together 780 & 750 software and paperware on
a website...
Incidentally, does anyone here that has a 780 (I know
there are several in
the group) run theirs? It takes 3 phase power, but there are no loads
connected phase-to-phase, only phase-to-neutral (although there is a small
3-phase transformer in the power controller, it could probably be wired to
only use one phase or else bypassed completely) so it can run entirely on
110 volts, at about 60-70 amps continuous draw. I was thinking of using
split-phase 220, putting 2 phases on one hot and 1 on the other, then
putting the Unibus cabinet and disk and tape drives on the hot with only 1
phase on it. I figure this would about balance the draw at 40 amps, 220
volts, which isn't too unreasonable.
There is a single unregulated 25V supply (unknown current) which runs off
a three phase x-former... This supply is then regulated down to +15V to
run the airflow and temp switches, and also a 12mA(?) current source for
some reason which escapes me... I think you should disconnect the
three phase transformer before hooking up two phases to the same hot...
My plan is to just set up a new 25V unregulated supply once I figure
out how much current it needs to supply...
Richard Schauer
rws(a)enteract.com