Okay, I see why your confusion. I also think I see how to better explain the oddity of the design.
This thing is for an iPad. There's no joystick APIs-- Apple never wanted us to use anything but the touchscreen. So, an external controller had to shim into SOMETHING already existing. Since the newest models have bluetooth keyboard support, they chose that.
Only thing is, they can't pull raw data off the keyboard state. They get keyboard "pressed this key and released" events, just like the onscreen keyboard provides. So, the only way to actually get the state info they WANTED was to literally do a hack job and use multiple keys to simulate state.
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Try checking the MAME manual at http://docs.mamedev.org
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