Dig into this forum thread which does a great job of reverse engineering the silicon design: http://forum.6502.org/viewtopic.php?f=8&t=4150 http://forum.6502.or

Dig into this forum thread which does a great job of reverse engineering the silicon design: http://forum.6502.org/viewtopic.php?f=8&t=4150 http://forum.6502.org/viewtopic.php?f=8&t=4150 Theoretically you could reproduce this with discrete components if you can figure out the entire circuit. That would be a pretty epic build that I'd love to see!