Flip-Flop Test Jig

A project log for ED-64: A discrete 8-bit computer

ED-64 will be an 8-bit computer built with discrete components, and will feature a ferrite core memory (documented as a separate project).

Andrew Starr • 09/27/2015 at 06:27•1 Comment

The jig to test the flip-flops has been finished:

The jig is basically an Arduino Mega 2560 and a Protoshield. Press the 'GO' button and the flip-flop under test is checked for /RST, /SET, D->Q, and output tristate functionality. I've tested the 18 flip-flops I made earlier and found 4 failures - more than I'd like. But the jig indicates at what point in the testing that the failures fail so troubleshooting shouldn't be too difficult. And I have 14 which are ok!