Kempston Mouse Buttons

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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).