IBM keyboard cable pin assignments ---------------------------------- For the PC (both ends): Pin 1: +Keyboard clock (+5 Vdc signal level) Pin 2: +Keyboard data (+5 Vdc signal level) Pin 3: -Keyboard reset (not used by keyboard) Pin 4: Ground Pin 5: +5 Vdc For the PS/2 keyboard and mouse connector: System end (6-pin DIN) Pin 1 : +KBD data Pin 2 : Reserved Pin 3 : Ground Pin 4 : +5 Vdc Pin 5 : +KBD clk Pin 6 : Reserved Shield : Frame ground Keyboard end (6-pin phone) Pin A : Reserved Pin B : +KBD data Pin C : Ground Pin D : +KBD clock Pin E : +5v Pin F : Reserved Shield : Frame ground