Amiga mice can sometimes be difficult to be find. They are direct-switch and don't use any sort of protocol like PS/2/USB/ADB mice do. However, many ancient DOS machines used the Logitech Bus/Microsoft InPort standard, which is electrically identical to what the Amiga used. Only the pinout is different.


|Signal             |Amiga Pin|Logitech Bus Mouse Pin|
|+5V                |7        |1                     |
|GND                |8        |9                     |
|H-Pulse/X2/XA      |2        |2                     |
|HQ-Pulse/X1/XB     |4        |3                     |
|V-Pulse/Y1/YA      |1        |4                     |
|VQ-Pulse/Y2/YB     |3        |5                     |
|Left Mouse Button  |6        |6                     |
|Middle Mouse Button|5        |7                     |
|Right Mouse Button |9        |8                     |


Amiga connector:

{{:connectors:db-9f.gif}}


Logitech Bus Mouse connector:

{{:connectors:din-9m_fixed_.png}}