Reply 24080 of 27784, by BitWrangler
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- l33t++
ayandon wrote on 2023-03-29, 06:42:With the kind help and great work from this YouTube video and its author, I managed to build this awesome 41256 DRAM TESTER for so cheap and fully effective.
I tested all my 54 ICs (KM41256AP-12), 10 found to be dead/bad.
Now, I can test ICs ordered from Aliexpress/eBay also.
Wow, this looks like a great new tool. I will have to remember this for when I am next playing around with PC, XT and early AT RAM...
Got me wondering how fast it goes, not sure I'd start trusting it at 100ns and faster.... potentiallly could be ported to a bluepill board or similar for faster RAM testing.
Seems like you could also test 30 pin SIMM 4 bits at a time. Possibly the whole thing on an arduino mega with more pins... didn't really check how many pins got used up there.
What would be really exciting if we got it working on a ~160Mhz board, would be testing cache SRAMs maybe, need some careful layout by then though, lest your trace/wire lengths mess things up.
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.