ACreal IO
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ACreal IO is a firmware code for Arduino to build Konami ACIO compatible boards.

Konami ACIO is a protocol used for communication between arcade games and harware components such as e-Amusement readers.
Its uses rs232 and allows several "nodes" to be connected a single serial port.

Games support
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Currently this project supports the following games : (nodes description)

pop'n music 15-18 (one old slotted reader)

pop'n music 19-21 (one new wavepass reader with encrypted communication (only game I know which use this encryption) + optional card dispenser)

iidx 13-18 (2 old slotted readers)

iidx 19-20 (2 new wavepass readers)

jubeat 1 - knit (one old slotted reader (no keypad) + one led board (game won't boot if the led board is not present) 

DDR (2 old readers in sd, 2 new readers in HD)

drum mania (1 old reader)

guitar freaks (2 old readers)

Sound voltex (1 new wavepass reader + 1 IoBoard )