Kempston Mouse Buttons
From SpecNext official Wiki
| Number | $FADF |
|---|---|
| Decimal | 64223 |
| 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 |
Mouse sensitivity and button reversal can be adjusted via Peripheral 5 Register ($0A).