Gregory's Servertonight's mini project: I built up this adapter board for testing IBM RAM chips in their odd little SLT package
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 @tubetime What's the geometry of A[0..8] and DQ[0..3] that results in 256Kx3 for these little memory cubes? @swetland it's cursed, the chip is actually 256Kx4 but during manufacturing test they've found that 1 bit doesn't work, so they down bin it as a 256Kx3. and mark with 1 of 4 possible part numbers...  @tubetime @brouhaha i'd assume so, once i get my DRAM tester working i'll figure out how fast they are. i'm assuming 80ns. |
@tubetime I had a board from an IBM mainframe but I don’t know what happened to it. I did try to unsolder (desolder?) one of them and teenage me was unable. I still don’t know what the trick is.