Keyboard Interface Description. The serial Keyboard used on Personal Computers [PCs] is a [PS/2] 6 pin Circular DIN. The pin-out for the PS2 Keyboard or. IEEE Int Conf Rehabil Robot. Jul; doi: /ICORR Comparison of tongue interface with keyboard for control of an. Pascal Leray has designed and built an keyboard interface for an amazing classic organ that he's built. Main board: dedicated to contacts or.