Kempston Mouse
From Sinclair Wiki
The Kempston mouse was a Bus mouse interface.
Note, The original Mice have a different pinout to either Amiga, Atari or Datel mice, so don't mix them up! In particular, plugging an Amiga or ST mouse into the original interface will fry the mouse as it puts +5v right into the output of one of the mouse outputs!
| Port | Port # | decoding | Usage | Notes |
|---|---|---|---|---|
| 64479 | FBDF | xxxx x011 xx0x xxxx | X axis | 00-FF Roll over at 0 |
| 65503 | FFDF | xxxx x111 xx0x xxxx | Y Axis | 00-FF Roll over at 0 |
| 64223 | FADF | xxxx xx10 xx0x xxxx | Buttons | D0:Right D1:Left D2:Middle (Some compatables only) |
