From SpecNext official Wiki
| Number
|
$FADF
|
| Decimal
|
|
| Short desc.
|
Reads buttons on Kempston Mouse.
|
| Bit Mask
|
%---- ---0 --0- ----
|
| Readable
|
Yes
|
| Writable
|
No
|
| Subsystem
|
Input
|
| Bit |
Function
|
| 7-4 |
contains wheel-delta value (0..15) since previous read.
|
| 3 |
fourth button
|
| 2 |
middle button
|
| 1 |
left button
|
| 0 |
right button
|
