hp2100 memory problems

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Sat Jul 24 14:31:02 1999

I'm not familiar with HP systems, but I am familiar with parity memory
systems (and ECC memory systems). One thing that you have to watch out for
is unitialized memory nearly always reads as an error so it is essential at
start time to turn off the parity/ecc interrupt, and _write_ every location
in memory so that the parity/ecc ram can be correctly initialized. Then
turn on the parity/ecc interrupt and if you get an interrupt it is a valid
indication of bad memory.

--Chuck

At 10:24 AM 7/24/99 -0500, Jay West wrote:
>I'm getting parity errors on both 2100s. Each one has 32k, so my idea was to
>switch to an 8k configuration, swapping till I isolate which boards are bad.
>The CE goldbook talks about this a small amount, but even with that info all
>eight 8K boards appear bad. I find this hard to believe, so I must be doing
>something wrong.
Received on Sat Jul 24 1999 - 14:31:02 BST