Acquire a PDP11/34 system recently (11/34 CPU, RX02
dual drive, 2 off
RL01 drives) ; before shipping it was running to the point of
displaying an @ sign on the terminal happily (it didn't boot from DY
as it should have but I thought I'd address that once it was back
home).
However, on putting it back together in my shed, the beast shows no
What did you dismantle for shipping? Is it possibly you forgot to plug
something back in inside the 11/34 power supply?
front panel lights (not even DC OK), no LEDs on any
cards & no @. The
fans whir when powering on (
OK, so it's getting mains as far as the transformer.
HAve you checked the DC power supply rails at the backplane? That would
certainly be my first test.
If I want to take out the RL01 & RX02 controllers
& the unknown card
in slot 6, do I just leave the cards out (I'm a QBUS guy, don't know
much yet about UNIBUS and any daisy chaining DMA/INT signals etc) or
will I need some grant controllers of some form (I may have some in
the PDP11/44 system I have awaiting restoration)?
You do need grant continuity cards in the Unibus. In fact there are 5
grant lines -- 4 BG lines for interrupts and an NPG line for DMA.
There are 2 sorts of grant continuity cards. Single-height ones go in
slot D only, and connect the 4 BG lines. You have to put a wire-wrap
jumper between pins CA1 and CB1 on the back of the backplane for the NPG
line. Dual hight ones go into slots C and D and complete all 5 grants.
Any pointers for what to check out & in what order?
(1) check the PSU!
-tony