I am absolutely certain that every one of these connections is correct. https://photos.app.goo.gl/mzJbKM3cWJ8AgGic8
This is essentially a MiniNDP (which is essentially a Node Datapac but with a single large sram), minus the battery stuff, in the form of all through-hole dip parts on a breadboard. I think I deduced how the 2-bank 512k rampac is supposed to work by a combination of studying the single bank 256k datapac and capturing bus traffic from ram100.co when it tries to access the 2nd bank. I already drew up an updated schematic and pcb and ordered some pcbs, but still I figured since I actually have dip versions of all the chips, and it's only 5 chips plus the sram, I'd try to breadboard the whole thing and use that to see if it works first. Start with a simple copy of the known-working 256k circuit, then once that is verified, add my guess at the few changes to support bank1 and 512k. For some strange reason I hesitate to actually try it now. Might have something to do with the 3 or 4 errors I already found and corrected along the way. -- bkw
