Sega Mega Drive controller on CPC 464?

[TotO]

Reading the description, the controller is not hacked. It's the 6 buttons for Megadrive.
(and they said it was compatible SMS/Amiga 2 buttons, and 1 button for other computers...)

[n00b]

Here's a link to my (german) tutorial for a CPC joystick adapter for 2 players and with Mega Drive controller support: http://circuit-board.de/forum/index.php/Thread/20739-CPC-2-Player-Joystick-Adapter-mit-Supportfunktion-f%C3%BCr-Mega-Drive-3-Button-Contro/

Works like a charm. 
And if you want to bulid your own here are the gerber files for production: https://oshpark.com/shared_projects/M5fO5aqt

[khaz]

The GX4000 gets a lot of flak, but really isn't that terrible. At least it's better than a joystick, and both buttons work out of the box. Sure it's a little stiff, but it does the job.