Setting up a VAXstation
Roy J. Tellason
rtellason at verizon.net
Sat Oct 6 18:09:58 CDT 2007
On Saturday 06 October 2007 17:30, Tony Duell wrote:
> Again, how on earth cna you know what the fault is if you can't diagnose
> it. You mentioned swapping a DIMM. How can you know if an intermittant
> memory problem is a fault in the DIMM or in the memory controller on the
I've wondered about that for a while now. I've used various memory
diagnostics on different machines over the years, and basically they all
seem to have in common that they write different patterns to memory and then
read it back for comparison. While this is okay as far as it goes, how DO
you deal with the situation you mention there?
Another one I ran into some years back (my first purchased 386 board actually)
was what appeared to be a problem with cache. I *still* have no idea whether
the lockups I was seeing that went away when I disabled external cache were
the fault of the cache ram or something on the MB, and I've never run across
anything that appeared to be capable of testing that function.
> > > Actually, there are some ISA boards I am still looking for. Top of the
> > > list is an origianl IB< PGC.
> > I don't know what that is. I have a bag of ISA kit: mostly multi-I/O
> PGC = Professional Graphics Controller. An IBM board set (3 boards
> fitting into 2 adjacent ISA slots (there's a memory PCB sandwiched
> between them) that form an intellegent-ish graphics card with an 8088 to
> control it (!). I have the techref, I'd love to play with the boards.
Ah. I was wondering about that too. If you'd said "PGA" I would've had a
clue right off.
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