It's not really a array.
The banks are build op from 16 times 1*8k RAM's there are two banks one low
one high.
Octal 60 and 70 and I replaced on both banks the bit 9 chips, because the
program marked the bit 9 as faulty.
The problem is it's always bit 9 but not always the same address and not
always the same output sometimes sense is 0 sometimes sense is 1.
So the suggestion from Tony to check the vias, is the next step I'll take.
-Rik
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at
classiccmp.org
[mailto:cctalk-bounces at
classiccmp.org] Namens dwight elvey
Verzonden: zaterdag 4 april 2009 23:41
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: RE: HP 9825 16K 09825-66523 memoryboard failure
----------------------------------------
From: hp-fix at xs4all.nl
That wasn't the problem, the errors are a bit erratic
always the same
bit 9 but not always the same address.
Today I replaced the address buffer ('LS368) but that wasn't the
solution too.
Hi
Do realize that with a RAM array, the failing location of a
RAM test is not always the bad RAM. It could be most any of
the other RAMs on that same wire.
Dwight
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