>I recently acquired a DEC M7551 (4Mb memory) board for my 11/23+. I
>installed the board, but the system traps while doing the power-on memory
>test. Unfortunately, I don't have any documentation for the board and I'm
>not sure if I have the jumpers/switches set correctly. It could be that the
>board is just dead, but I'd like make sure before I give up. If someone
>could forward me the settings, it would be greatly appreciated.
Are you sure it's a 4 Mbyte (M7551-CA) board? If it's a 2 Mbyte (-BA)
or a 1 Mbyte (-AA) board then it's very possible that it's jumpered
for some other starting location than zero. And your CPU self-test
is expecting memory starting at zero.
If you can get to ODT ("_at_" prompt), try doing some examines of various
locations, i.e. "0/", etc., and see if you get anything.
If the board isn't responding at "0/", try higher addresses and see if
it's living there.
--
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 Tue Feb 15 2000 - 12:11:57 GMT