Sinclair ZX80 / ZX81 / Z88 Forums

Thanks for the steps on debugging the 16K RAM expansion Pack (even 10 years later! :-) ). On Step 4, after I had verified all my DRAMS were getting the correct voltages, I used the DRAM IC piggybacking method (placing a known good IC on top of the suspect IC that is soldered to the board) and was ab...