[Techtoolslist] 9010 ram pattern error?

[David Shoemaker]

Oh and the message is changing from FE -> Ff to FE -> 00

-----Original Message-----
From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of
David Shoemaker
Sent: Sunday, April 2, 2017 7:48 PM
To: 'Technical Tools Mail List' <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] 9010 ram pattern error?

Looping results in an unstable OK / Err condition.  

-----Original Message-----
From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of
Tony Jones
Sent: Sunday, April 2, 2017 6:34 PM
To: Technical Tools Mail List <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] 9010 ram pattern error?

On Sun, Apr 2, 2017 at 5:46 PM, David Shoemaker <davids at oz.net> wrote:
> I have never been able to wrap my head around the pattern error.

The long test is looking for pattern sensitive errors (nearest neighbor).

What happens if you LOOP (see 4H-11 in the operators manual).

I've seen similar on a (non arcade) board with a bad bus transceiver but it
can also indicate a fault in the RAM itself.
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