Forgot to post here...16Kx1 DRAM NOS at Goldmine

On Jan 16, 2013, at 12:53 PM, Richard <legalize at xmission.com> wrote: I swear I saw the PCBs somewhere, but perhaps I dreamed them up; this little hack is easy enough to do straight on the chip, but it would be a pain to do the NCs with through-hole parts unless you offset the board by 100 mil (which would cause spacing problems in a lot of closely-spaced RAM arrays): http://www.robotron-2084.co.uk/gifs/4164hack.gif The other thing that is often done is to convert the board en masse to 4164s by rewiring the power supplies, but that relies on the +12v and -5v supplies being unused by the rest of the system (as is the case with Defender, but quite probably not with other boards): http://www.robotron-2084.co.uk/techwilliams4164.html You could make an adaptor board by stacking two boards with a header running up through the center (I've seen similar things with EEPROM burner adaptors), but it's a bit clunky and it can be difficult to keep the two layers' back-side pins from touching. Still doable, though, which is better than not. The other thing to do is alter an IC socket as a "pass-through adaptor" to do what the above animated GIF specifies. That's easy enough to do and doesn't run the risk of forcing the holes of your target socket too wide (as with .025" square-post pins). Can be quite a bit of work to make sure the NC socket pins don't contact the target socket pins, but it's doable. - Dave