Pinouts of Connectors

Macintosh Mouse connector pinout

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

9 pin D-SUB FEMALE connector pin-out & layout
9 pin D-SUB FEMALE connector  at the computer
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)

Note: Direction is Computer relative Mouse.

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9 pin D-SUB MALE connector pin-outs & layouts
9 pin D-SUB MALE connector  at the mouse cable
Pinouts.ru > Pinouts of input devices (keyboards, mices, joysticks) >  Pinout of Macintosh Mouse connector and layout of 9 pin D-SUB FEMALE connector and 9 pin D-SUB MALE connector

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