RAM chips randomly failing

Upgrade your RAM from ST to Falcon.
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olivier.jan
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RAM chips randomly failing

Post by olivier.jan »

Hi,
I have a strange behaviour with some RAM ICs from a 1040STF motherboard, some chips fails randomly.
I add memory issue on this motherboard and unsoldered all the chips over the Week-end in order to test them 1 by 1.
I've been testing all the chips since yesterday using a quick setup with an Arduino and I have at least 4 defective chips which gives me errors each time.
22 other chips seem to be good, showing no issue after multiple tests but the last 8 are a bit strange, working sometime during multiple pass of the tests and sometime failing multiple times in a row. Is this common or chip failure should be more clear ?
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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exxos
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Re: RAM chips randomly failing

Post by exxos »

I would just suggest using a STFM to test chips etc everything is known to work.. I can't comment on other ram testers.. But chips in a stfm only really fail if the PSU is bad, or chips are faulty , or bad soldering etc
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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stephen_usher
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Re: RAM chips randomly failing

Post by stephen_usher »

Or they're manufactured by MT.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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