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4 pin RJ11 female connector layout
4 pin RJ11 female connector
This connector is present on the Macintosh 128K, 512K, 512K enhanced, and Macintosh Plus.
Pin Name Dir Description
1 CGND --- Chassis ground
2 KBD1 ? Keyboard clock (input to VIA)
3 KBD2 ? Serial data line
4 +5V --> +5 VDC
4 pin RJ11 male connector layout
4 pin RJ11 male connector
According to 2 reports in our database (2 positive and 0 negative) the Macintosh Keyboard pinout should be correct.

Is this pinout
Source(s) of this and additional information: Apple Tech Info Library, Article ID: TECHINFO-0001424
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