19 Jun
2014
19 Jun
'14
9:15 a.m.
Just thought I'd throw it out there as something for consideration... the
biggest mini I have is an 11/34a and that runs on single-phase no problem,
but I know some guys out there have much larger pieces of equipment... my
ROLM SCBX is "only" what, six or seven shelves of TTL (maybe 70% full?) and
analog circuitry across two racks, and that wants three-phase to run as
configured at the factory.
Best,
Sean
P.S. Any old ROLMen on the list?? I could use some help rustling up some
documentation for 8000-series CBX... ;)
On Thu, Jun 19, 2014 at 11:34 AM, Jon Elson <elson at pico-systems.com> wrote:
On 06/19/2014 02:47 AM, cctalk-request at
classiccmp.org wrote:
Hi Sean,
No three-phase available nearby so if I ever do need it I'll be using a
rotary
converter or VFD or something.
Luckily I don't need it at the moment.
It will likely have it's own transformer and drop.
I'm sure it will be at least 200A service.
There are only a VERY few devices that can be connected to a PDP-11
that need 3-phase power. One I know of is the RP07, but that is
really a VAX peripheral. Since it is Massbus, it COULD be connected to
an 11/70, though. Possibly also the RP06 might also be 3-phase.
In general, though, these machines are QUITE low power compared to
higher-end machines like PDP-10's and early VAXes. I can't imagine
any PDP-8 system that needs much power. Unless it was loaded
with a BUNCH of RK05 drives, I can't imagine it wouldn't run off
a single 120V 15A outlet.
The PDP-11/45 draws enough power it would need separate outlets
for the CPU and the drives.
Jon