Konami IO-2 USBIO
pop'n HD cabinets use a variant called "IO-2-R",
which presumably has modifications to eliminate the warm up voltage for the lamps.
pop'n SD cabinet variants of the IO-2 seem to have onboard hardware that applies some processing to the video signal coming from the Bemani PC. When DIP4 is in the up position, the Bemani PC + USBIO outputs a 15 kHz signal, whereas when it is in the down position, it outputs a 31 kHz signal.
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