Logitech TrackMan T-PA1-9MD Bus Mouse to NeXT non-ADB

Background:

I needed a mouse which could be used in a stationary position for testing and this mouse is known to work with some modifications. The instructions available are incorrect for this model. Some of the pins will need to be changed.

Modifying the mouse

Step 1) Flip the mouse over and remove the 4 screws under the rubber bumpers. The mouse should now open.




Step 2)(optional) The circuit board is held in place by 4 plastic clips (red arrows). Pry back on the clips and lift. Be careful with the black plastic assembly containing the rollers. The springs may fall out of place.



Step 3)(optional) While disassembled it would be a good idea to replace the 10uF 35V capacitor (green). Mine showed signs of leakage.

Step 4) Cut the connector side of the cable. Wire according to the below photos/tables. DO NOT TRUST THE WIRE COLOR ALONE. There are some variations in the cabling. Instead use the mouse internal connector as the guide.

Mouse Pin	Color	Function	Next Female Connector
1	Green	Switch 1	7
2	Purple	Switch 2	NC
3	Gray	Switch 3	6
4	Black	5V	1
5	Black	Conn GND	connector shell
6	White	GND	8
7	Red	XB	3
8	Brown	XA	2
9	Orange	YA	4
10	Yellow	YB	5

Summary:

The tracking is actually much better than a NeXT original mouse. With the proper pinout I expect this mod could be done in well under an hour.