Great Job on the Mame port GeekDoc!!! It is a little beta (I think it there is a memory leak) but definitely playable on select games. ie. Ones that don't have a fire/jump/action button.

So far, I have gotten the following few games to work (with required roms listed and rough FPS):

Pacman or Puckman - pacman.zip, pucman.zip 16.6 fps
Pacman Plus - pacplus.zip 15.4 fps (probably needs the pacman roms listed above)
Ladybug - ladybug.zip 19.4 fps
Frogger - frogger.zip 11.1 fps
Super Q-Bert - sqbert.zip 13.5 fps

All are very playable and it is frankly amazing that XMame runs at all on such a little machine.

The sound is quite good (a little coarse but workable) on these games actually. I think some games or gaming hardware that uses more sophisticated sound circuitry could bog down the emulator on the 770. Having an option to select lower sound sampling frequencies or ditching sound altogether could help with framerates and memory problems/crashing.

One note, on some games the initial "You must own this machine to play this ROM" warning screen asks you push left/right on the joystick. The graphics have been rotated 90 degrees clockwise, so left/right in this case is down/up. Once the game as started, the joystick controls are rotated appropriately.

I think some games won't work as they're not expecting a portrait screen orientation, but a horizontal one and thus won't run in the current orientation. It'd be nice to be able to specify which orientation you'd like the emulation to run to try to get some of these games. Is the screen orientation set at compile time or is there a command line parameter to set this?

A very promising start as there are many old school games that didn't require anything for controls except a joystick. If we can get some button remapping to get the select, escape or menu buttons to become buttons 1 and 2 then we'll have alot more titles to play. Albeit we're kinda stuck with the awkward D-pad on the 770, it really wasn't designed with heavy gaming in mind. USB Gamepad support anyone? : )

Once again, great work

Dave