DavidMil Posted January 15, 2018 Share Posted January 15, 2018 Well I was back in the attic (sorry for those that are sick of this) and I found a cardboard box (about 4" x 4" x 4") full of RAM chips. Most are 16K, 64K, 256K type chips, but I found 24 each of the following chips: P21010-80 MM5290N-4 And 16 each of these: UM61256FK-15 GM71C4256B-70 I'm assuming that these got mixed in with the Atari RAM and came from IBM type clones. Can anyone shed a little light on this assumption. The rest of the chips in the box were: 48 16K Chips, 64 64K chips, and 24 256K chips I may have been replacing MT chips and/or doing some RAM upgrades, because the vast majority of the 16K and 64K chips are MT42 series. Thanks for any info, DavidMil Quote Link to comment Share on other sites More sharing options...
toddtmw Posted January 15, 2018 Share Posted January 15, 2018 You clearly led an interesting life back in the day. It's amazing that you keep "finding" stuff that you don't really remember. I imagine you could tell some good stories about your experiences. You should consider starting a topic about that. (I would find it interesting...) Quote Link to comment Share on other sites More sharing options...
toddtmw Posted January 16, 2018 Share Posted January 16, 2018 Google P21010-80 leads to this datasheet which describes them as 1MX1 FAST PAGE DRAM, 100ns, PDIP18. (Looks like they are 1 megabit chips) Google MM5290N-4 leads to this datasheet which describes them as 16384-BIT (16384 X 1 ) DYNAMIC RAM (Looks like these are 16kbit chips) Quote Link to comment Share on other sites More sharing options...
Roydea6 Posted January 16, 2018 Share Posted January 16, 2018 (edited) IntoTheAttic_Atari_Piesiu.xex I thought that you might like to have an Avatar for your profile.. Edited January 16, 2018 by rdea6 3 Quote Link to comment Share on other sites More sharing options...
toddtmw Posted January 16, 2018 Share Posted January 16, 2018 Maybe you should do some more digging might find something valuable like this family: https://www.google.com/amp/s/kotaku.com/5955196/old-video-game-in-familys-attic-turns-out-to-be-extremely-rare-possibly-worth-30000/amp 1 Quote Link to comment Share on other sites More sharing options...
Level42 Posted January 16, 2018 Share Posted January 16, 2018 Oh man...... Would I love to see pics of ALLLLLLL those mT RAMS and.......if they work or not..... :D Quote Link to comment Share on other sites More sharing options...
ivop Posted January 17, 2018 Share Posted January 17, 2018 UM61256FK-15 is 32Kx8 SRAM, 150ns. You could use two of them to replace 64kB of DRAM. Never done that though, but something similar is still on my todo list (128kB SRAM in a 130XE). GM71C4256B-70 is 256Kx4 DRAM. Quote Link to comment Share on other sites More sharing options...
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