Motivation I came across a Teenage Mutant Ninja Turtles (TMNT) board recently. The TNMT games on Konami boards are very iconic both in their 4 player and 2 player forms. According to the listing the board was "Tested, working" and the seller even did a retest prior to sending which reported on "Retested, working". So all great... until it arrived. Upon testing, I realized the inputs were not working properly. Buttons were mostly okay, but only the left direction was working, and the same afflicted the input 2. I thought that it could be some sort of non-standard JAMMA input mapping, and even replaced the EPROMs with the 2 player version of the game, but problem persisted. Understanding the problem Finally I decided to take a look at the schematics. On page 17 of a PDF manual I downloaded, I found the input section, which looked like this: Okay, so it looks like all inputs go through a component labeled 005273, which are labeled RN1 to RN10. And guess what? it se