Oh and the message is changing from FE -> Ff to FE -> 00 -----Original Message----- From: Techtoolslist [mailto:techtoolslist-bounces@flippers.com] On Behalf Of David Shoemaker Sent: Sunday, April 2, 2017 7:48 PM To: 'Technical Tools Mail List' <techtoolslist@flippers.com> Subject: Re: [Techtoolslist] 9010 ram pattern error? Looping results in an unstable OK / Err condition. -----Original Message----- From: Techtoolslist [mailto:techtoolslist-bounces@flippers.com] On Behalf Of Tony Jones Sent: Sunday, April 2, 2017 6:34 PM To: Technical Tools Mail List <techtoolslist@flippers.com> Subject: Re: [Techtoolslist] 9010 ram pattern error? On Sun, Apr 2, 2017 at 5:46 PM, David Shoemaker <davids@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. _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/