Not trying to hijack this thread - just wanted to mention that as an alternative to set49mode you can use LEDBlinky to program the GPWiz49 on the fly. True, LEDBlinky's primary purpose is to light up LEDs, but it has a 'No LEDs' mode for users with GPWiz49's or u360's and no LEDs. The one advantage LEDBlinky has over set49mode is it can be configured for any emulator (not just mame). Anyway, I'll shut up now