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Memory testing.. any idea whats going on here? [message #395339] Wed, 03 June 2020 23:25 Go to next message
Anonymous
Karma:
Originally posted by: chris.todd

This is on a Rom3 GS with a Transwarp GS running at 10MHz, 32k cache using the SHH Systeme cache card. Memory card is a ByteBoosters DarkRAM 8MB.

Whenever I run a memory test - either BitBanger or the ReactiveMicro MegaMemoryTest I get very odd results.

With MegaMemory test, I get “errors” detected that don’t appear to be errors, for example:

“Bad memory word detected at $27D8C8. Read $0008. Expected value $0008”

“Bad memory word detected at $279358. Read $0040. Expected $0040”

For each “error” the “read” and “expected” are equal - so how is that an error?

BitBanger simply complains that it found a “fatal error in my accelerator cache”.

The TWGS passes all self tests even on continuous loop for a couple of hours, so to me it feels doubtful that it’s a cache issue, especially with a more “modern” cache board in there.

One thing I did notice is when I upgraded my TWGS from 8k to 32k and forgot to cut traces TC4/TC5, everything still worked as expected. The TWGS actually recognized 32k cache and passed self tests and booted just fine.

The system seems relatively stable, so I’m not sure if I should be concerned with these random memory issues in every tester I try.

The TWGS also has a new ReactiveMicro cable, replaced power filter capacitors, and the GS has a brand new Ultimate PSU from Reactive.

Other cards are a Carte Blanche (Original), CFFA2000, Uthernet I and a clone Z80 Softcard.

Should I be concerned about these memory errors that show up on these tests? Any idea why a matched value would show as an error?
Re: Memory testing.. any idea whats going on here? [message #395410 is a reply to message #395339] Fri, 05 June 2020 07:22 Go to previous messageGo to next message
gbody4 is currently offline  gbody4
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Registered: October 2012
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Have you tried testing the memory without the transwarp installed?
Do you get similar errors?
Re: Memory testing.. any idea whats going on here? [message #395468 is a reply to message #395410] Sat, 06 June 2020 03:47 Go to previous message
Anonymous
Karma:
Originally posted by: chris.todd

Yes. I have a second IIGS that’s stock ROM3, and get errors reported, but the comparison values still match.
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