SpritesMind.Net

I searched in Google.
But I did not find documents about joypad.

Where can I find?

The Genesis emulator writers should be able to answer this one.

Or you could try messing about with the I/O ports (the ones starting at 0xA10000) and see if you get something that matches your joypad input.

Charles MacDonald website is out so if anyone can point to his genio.txt file...

else you could search for segasix.txt if you're looking for hardware info.

I saved some documents here recently:
http://code.google.com/p/genplus-gx/downloads/list

just look for gen_io.pdf, this is the same as gen_io.txt

Thanks, there were some useful docs in that archive of yours that I hadn't seen before.

As for the joypad, there's a few pages in the official Genesis Programming Manual. Check pages 79 to 82. There's also some information scattered through the technical bulletins at the end. There's probably nothing in here that's not covered by that gen_io doc Eke posted, but if you want another source to compare to, it might come in handy. You can download the manual from http://nemesis.hacking-cult.org/MegaDri ... Manual.pdf

If you check the 32X SDK, you'll find code that shows how to detect the various kinds of controllers that might be plugged into the SEGA, and how to read them. For example, you'll see how to distinguish between a 3 button pad, 6 button pad, mouse, etc.