critical has updated his port of UAE4ALL (UAE for DC) for the GP2x. Release notes:

I fixed the annoying crash on exit back to GP2X menu (exit now works), and I defined the Y button as joystick button 2, as I noticed that a few games that would otherwise have run okay need the space bar or second button (Turrican, Shadow Dancer, Chase HQ, Wonderboy). Now I’m only going by the wiki comments, but these were noted as needing the space bar, and at least in Turrican joybutton2 works for that function too.I don’t have Shadow Dancer, Chase HQ or Wonderboy, so if whoever enteredthose comments on the wiki could try this update, I’d be grateful. Otherwise, no other goodies in this version.