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Connector pinout: Macintosh Keyboard Macintosh Keyboard Available on Macintosh Mac Plus and earlier. RJ11 FEMALE CONNECTOR at the Computer RJ11 MALE CONNECTOR at the Keyboard pin name direction description color 1 CGND Chassis ground 2 KBD1 Keyboard clock 3 KBD2 Keyboard data 4 +5V +5 VDC