HP Vectra Technical Reference Manual page 135

4.3.3.4 Physical GID Driver
The physical GID driver is responsible for updating the Physical Describe Record. Two types of
graphics input devices are defined in the input system, absolute (touch screen and tablet), and
relative (mouse). An instance of this driver (same code module, different data area) is installed for
~
each graphic input device present.
A summary of the PGID function codes is provided in table 4.19.
Table 4.19
Physical GID Driver Function Code Summary
Vector Func. Function
Address Value Equate Definition
xxxH HP-HIL driver vector 1 through
Physical HP-HIL driver vectors (these
HP-HIL driver vector 7. vectors do not have fixed
HP_VECTOLTABLE addresses)
00 F_ISR
Logical Interrupt
02 F_SYSTEM System functions
02/00
SF_INIT Initialize driver
02/02 SF_START Start driver
02/04 SF_REPORT_STATE
Unsupported
02/06 SF_VERSION_DESC Report HP version number
Physical GID Driver Function Definitions
F_ISR (AH
=
OOH)
This function processes ISR Event Records, updates the fields in its Physical Describe Record, then
calls its parent driver. HP-HIL devices report upward relative motion with a positive sign and
downward relative motion with a negative sign. The industry standard representation is the
opposite of this.
126 Input System and HP-HIL