Pinouts of Connectors

Macintosh Keyboard connector pinout

layout
schematic diagram
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This connector is present on the Macintosh 128K, 512K, 512K enhanced, and Macintosh Plus.

4 pin RJ11 FEMALE connector pin-out & layout
4 pin RJ11 FEMALE connector  at the computer
Pin Name Dir Description
1 CGND --- Chassis ground
2 KBD1 ? Keyboard clock (input to VIA)
3 KBD2 ? Serial data line
4 +5V --> +5 VDC

Note: Direction is Computer relative Keyboard.

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4 pin RJ11 MALE connector pin-outs & layouts
4 pin RJ11 MALE connector  at the keyboard
Pinouts.ru > Pinouts of input devices (keyboards, mices, joysticks) >  Pinout of Macintosh Keyboard connector and layout of 4 pin RJ11 FEMALE connector and 4 pin RJ11 MALE connector

Source(s): Apple Tech Info Library, Article ID: TECHINFO-0001424
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