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Author Topic: SupraDrive 500 Ram question...  (Read 2112 times)

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Offline Zac67

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Re: SupraDrive 500 Ram question...
« on: September 14, 2012, 10:44:15 PM »
RAM testing on startup isn't thorough at all. Is memtest showing the bad memory bits? You can try swapping one pair of RAMs at a time, the error will move if you've got a bad one. 1Mx1 chips are easy to find used, shouldn't be too hard to replace.
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Offline Zac67

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Re: SupraDrive 500 Ram question...
« Reply #1 on: September 15, 2012, 11:22:38 AM »
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memtest bombs out when testing the external memory. It usually happens when it starts the write test portion of the test.


That sound more like an addressing problem (test data overwriting the program). Have you verified that all RAM pins make good contact into their sockets? No missed or bent pins? Solder points of the sockets in order?
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