A tool like that would be very useful. I've run into this situation a few
times before. You would think the Fluke long Ram test would catch it. But it
doesn't sometimes.
Kevin
On Sun, Aug 29, 2010 at 9:35 PM, John Robertson <pinball@telus.net> wrote:
> Matt J. McCullar wrote:
>
>> Well done, John! I know what it's like to fix a "tough dog." Just last
>> week I had a _Ms. Pac_ motherboard that turned out to have a bad 2114 RAM
>> --
>> it kept cycling through the initial boot-up sequence. I had an external
>> RAM
>> tester that said it was okay (of course), but I've seen this sneaky type
>> of
>> thing happen before. Substitution nailed it.
>>
>> You're right about mixing up different manufacturers of RAM chips!
>> Guaranteed to cause all manner of weird things to happen.
>>
>> Matt J. McCullar
>> Fort Worth, TX
>>
>>
>>
> This sort of thing - RAM that passes tests by test fixtures, but fails in
> the 'real' world - is a pain.
>
> I'm thinking of something that plugs into the CPU socket and after you
> 'tell' it where the RAM is located allows you to dial up the speed you want
> to test it at - or use the system clock. A simple Pass/Fail would suffice,
> you figure out which RAM is defective by the allocated space and if you are
> testing upper or lower bits (0 - 3, 4 - 7). This could be used with any
> static RAM...
>
> First though I'm going to dig out my old Atari RAM/ROM tester (comparator)
> and see if it can be used this way - why design something new when I may
> have a tool on hand that can be easily modified to do the job I want? Now to
> track down my manual - TM-120 is the one for the Atari Automatic ROM/RAM
> Tester...probably in the filing cabinets, and I see no scans posted at the
> usual suspects.
>
> John :-#)#
>
> (Vancouver, BC, eh?)
>
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Received on Sun Aug 29 22:38:54 2010
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