The Sega Mega drive controller might be among the nicest to use, but it utilizes a different interface to the IBM Compatible PC. This video covers how both interfaces work, plus how to build a circuit which will allow the use of Mega Drive (or Genesis, of course) pads on the PC.
Other places where I can be found;
/ discord (DXZeff#5619)
http://forum.dxzeff.com/
/ high_treason (Not really used any more)
/ hightreasonlp
Index
00:00 - Title
01:22 - Interfaces & Controllers
08:31 - Mega Drive Controller Port
13:07 - Possibilities
14:31 - Clock Source
18:04 - Building The Circuit
25:16 - Demonstration
30:52 - Outro
36:26 - Afterthoughts