HP Vectra Technical Reference Manual page 68

This field is divided into nibbles. Bits 7-4 contain the graphics input
device type. This field is loaded with the low order nibble of the
appropriate logical GID data type (table 4.5). Bits 3-0 are reserved.
ID byte of the physical device which last reported data. See table 4.2 for
a list of HP-HIL ID bytes.
Status bits for the logical device
Bit
OFH-OSH
04H
03H
02H
01H
OOH
Definition
Reserved.
Event enabled when set.
Tracking enabled when set.
Clipping enabled when set.
Button error occurred when set.
Interrupt in progress when set.
This contains the vector address divided by 6 of the last physical
device that reported data.
LD_RESOLUTION
Maximum number of axes supported by the device. Valid range is
0-2.
Device class. Bits 7-4 contain the current class. Bits 3-0 contain the
default class. See Appendix G for more information on device
classes.
Number of buttons and prompts supported by the device. Bits 7-4
contain the number of prompts. Bits 3-0 contain the number of
buttons.
Transitions reported per button, i.e., a set bit indicates that the
corresponding button was either pushed or released. Bit 7
corresponds to button 7 etc.
Current state of the buttons.
1
is down, 0 is up. Bit 7 corresponds
to button 7 etc. If LD_STATE is XOR'ed with LD_TRANSITION the
result is the previous button state.
This is the resolution of the logical device. For logical devices this is
typically one.
Input System and HP-HIL 59