I just got an iCade -- it is technically for an Apple iPad, but it is basically a generic bluetooth keyboard arcade controller.
It's great! But once I paired it with my laptop as a bluetooth keyboard for testing, I discovered something odd that does not bode well for using the iCade with MAME. All inputs show up as two (and only two) keypresses – one key when pushed down, and another key when released. Like so:
↑ w, e ← a, q → d, c ↓ x, z
(1 red) y, t (2 blk) u, f (3 blk) i, m (4 wht) o, g (5 red) h, r (6 blk) j, n (7 blk) k, p (8 wht) l, v
Most MAME emulators expect standard keyboard behavior. That is, when you are pressing left you hold down left the entire duration of the movement.
This isn't a big deal for the buttons -- buttons are instant activate so if I pressed y on my keyboard that is the same as, say, pressing fire in Galaxian.
But it makes the joystick a non starter since the keyboard key is not "held down" -- that is, when I use the joystick and press ← one a is sent.. ever. But when I stop holding down ← q is sent.
How can I configure MAME or other emulators to work with the iCade joystick and its peculiar keyboard interface? Is there any way to create a MAME config file that will work with the iCade?