I've been working on some new stuff. Well, old stuff, but now better!
The PC Engine pad. 2 buttons done so far, I've been delayed 'cause I had to create the connector component for the schematic app:
http://gamesx.com/wiki/doku.php?id=controls:pc_engine_controller
Megadrive 3-button pad schematic:
http://gamesx.com/wiki/doku.php?id=controls:megadrive_genesis_controller_3
controller encoder chips:
http://gamesx.com/wiki/doku.php?id=chips:chip_pinouts
They're WIPs, but I think they're good starts! The MD and PCE pad pages on gamesx.com have been in SERIOUS need of a rewrite since, well, since forever. =(