Input devices (keyboards, mices, joysticks) pinouts  > Apple pinouts
This connector is present on the Macintosh 128K, 512K, 512K enhanced, and Macintosh Plus.
Pin Name Dir Description
1 CGND --- Chassis ground
2 +5V --> +5 VDC
3 SGND --- Signal ground
4 X2 <-- Horizontal movement line (connected to VIA PB4 line)
5 X1 <-- Horizontal movement line (connected to SCC DCDA-line)
6 n/c - Not connected
7 SW- <-- Mouse button line (connected to VIA PB3)
8 Y2 <-- Vertical movement line (connected to VIA PB5 line)
9 Y1 <-- Vertical movement line (connected to SCC DCDB-line)
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the mouse cable
According to 1 reports in our database (1 positive and 0 negative) this 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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