Using a Bus Mouse on a computer that uses an Atari or Amiga compatible joystick port:

The following is a pinout of the Logitec Bus Mouse, the Microsoft InPort Mouse should use the same pinout, minus the middle button.

Wiring according logitech documentation

Pinout:

        7   8  9

       3  4  5  6

          1  2

(looking at male end of the mouse's connector)

Pin functions:

Wire     Mini-DIN       Logitech         Microsoft      Atari pin    Amiga pin
Color      Pin       P-Series Signal   InPort Signal      number       number
Black       1             +5V              +5V              7            7
Brown       2              X2               XA              1            2
Red         3              X1               XB              2            4
Orange      4              Y1               YA              3            1
Yellow      5              Y2               YB              4            3
Green       6              Left             SW1             6            6
Violet      7              Middle           SW2             -            5
Gray        8              Right            SW3             9            9
White       9              GND              Logic GND       8            8
SHIELD    shell            chassis          chassis         shell      shell