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pinout (распиновка)

Macintosh Keyboard connector

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Available on Macintosh Mac Plus and earlier.

4 pin RJ11 FEMALE connector  at the computer
Pin Name Dir Description
1 CGND --- Chassis ground
2 KBD1 ? Keyboard clock
3 KBD2 ? Keyboard data
4 +5V --> +5 VDC

4 pin RJ11 MALE connector  at the keyboard

Note: Direction is Computer relative Keyboard.

Источник: Apple Tech Info Library, Article ID: TECHINFO-0001424