GTCO CalComp BIT PAD TWO DATA User Manual page 11

LSB Least significant bit
MSB Most significant bit
PR Proximity, 0 when in proximity and 1 when out-of-prox
F Flag bit, identifying the stylus or cursor buttons being pressed. The cursor
output codes are switch selective:
*On the 3-button cursor, the buttons are distinguished by raised dimples, rather than by
numbered labels. In the table above, 1 corresponds to one dimple; 2 to two dimples, etc.
Bit Pad Two 11