Sega Megadrive controller on GPIO

[JPDefault]

Hello gents!

As per title, I'm trying to interface a Sega Megadrive controller to the Pi through the GPIO, in the simplest way (so that it will be compatible with Commodore/Atari controllers). I only need 2 buttons.
I could do something like this:

...but I am afraid it would damage my Pi.
As far as I know, the multiplexer in the controller should work just fine with 3.3V, so would you experts reckon I could do the same, but with the 3.3V supply from pin 1 or 9?

Cheers!
JPD

[JPDefault]

So, I went ahead and tried feeding the controller +3.3V instead of +5V. It worked just fine!
Well, except that I couldn't get the B button to work, but that was probably some dodgy contact in the cables I was using.
Anyone else trying to do the same?

[fuyres]

Select - signal from pi to gamepad
http://applause.elfmimi.jp/md6bpad-e.html
http://www.cs.cmu.edu/~chuck/infopg/segasix.txt

• send "Select Low" read 1 row(data0-5)
  send "Select High" read 2 row
  send "Select Low" read 1 row
  send "Select High" read 2 row
  send "Select Low" read 3 row
  send "Select High" read xyz row
  send "Select Low" read 4 row and reset
  send "Select High" read 2 row