Ahh, on-screen keyboard. Yeah, that won't work for the same reason Joy2Key and the like don't work. MAME uses advanced Windows functionality ("XInput") in order to properly support multiple keyboards/mice/lightguns and a lot of software of that nature isn't programmed properly to work properly in that situation (they're supposed to use a driver and appear as a real input device; most of them cheat instead).
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Re: Mame on windows 8 touchscreen tablet
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