>Anyway, I start the VT220 before the PDP and it gives a message VT220 Ready.
>I power up the PDP and basically get nothing at all. The only sequence that
>gets any response is hitting the halt button. The terminal then says:
>165262
>_at_
>When I hit the Restart button after that nothing happens for about 2
>minutes.
>Then an "&" prompt appears.
>Nothing I type in gets any response after that. Typing "help" gets no
>response.
The "165262 _at_" prompting is from ODT. ODT is a very simplistic monitor
that lets you modify memory and registers and start or single-step
through instructions in memory.
165000 is a common (but not the most common) address to put a ROM'ed
bootstrap at. I'm guessing that when you halted it it was either doing
the self-test or waiting for an external device to come ready.
The "&" prompt I'm not so sure about. It's possible that this is a prompt
from the bootstrap monitor (some Emulex bootstraps will say that) or
maybe it's from the OS/embedded application.
>The machine is in a BA23 case and was a PDP11/23 I think, but has a PDP11/73
>CPU upgrade. There is a full height ST506 hard drive reputed to be 30Mb in
>size, which spins and makes all the right noises.
>Any suggestions?
What would help the most of all is an inventory of cards in the backplane.
If they're DEC cards they'll have a "Mxxxx" number on the handle. Third
party cards you'll probably have to pull to identify. Also tell us
the exact position of each card in the backplane, and what cards are cabled
to what drives.
I suspect from the less-than-perfectly-standard bootstrap address of
165000 that you've got a third-party controller in there with on-board
bootstrap, though of course there an infinite number of permutations that
things could have been set up for!
--
Tim Shoppa Email: shoppa_at_trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
Received on Mon Mar 27 2000 - 08:22:04 BST