[Jesse] sent in this one. [Raphaël] decided to take NES practice to a new level by dedicating a NES console to run the arcade version full time. This is more than merely a ROM loading exercise, there are several differences between the NES and it’s dedicated arcade sibling, the Unisys VS. Memory was upgrade, several io pins are tapped and brought out for manual access via the newly added controls up front. At the very least, it’s a nice exercise in schematic reading. Given the mods and a few arcade accessories, you could reconstruct your own fully functional arcade machine.