[vcf-midatlantic] Testing 4164/41256 RAM Chips

Alan Hightower alan at alanlee.org
Fri Sep 15 10:57:19 EDT 2017


If you have or know someone who has an Elnec based eprom programmer -
also re-branded under DataMan, B&K Precision, and others, it will test
DRAMs as well. I assume select other brands of eprom programmers will as
well. Check the devices you have access to. 


On 2017-09-14 18:24, John Heritage via vcf-midatlantic wrote: 

> Hey folks,
> I've come across an old PC XT motherboard that's sat in a dirty warehouse
> for a long time. It has 18 x 41256 and 18 x 4164 (640KB total + parity)
> RAM chips.
> Knowing that i've needed some of these in the past to repair my old Atari
> computers, I'd like to test these individual RAM chips somehow, but
> preferably without abusing the old sockets on my Atari's..
> Does anyone know of a relatively simple circuit I can build to test these
> chips directly?
> The 4164s come on the Atari 600XL, 800XL, 1200XL and 130XE, and the 41256
> come on the 4-chip versions of the 130XE. The micron 4164's that came on
> a lot of old Atari's are just flat out dying (I had 3 x 800XLs out of 7
> that had bad ram), so these are handy for that or other communities.
> Thanks!
> John

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