HP Vectra Technical Reference Manual page 137

SF_START (AX
=
0202H)
This subfunction starts the driver.
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_START (02H)
BP
=
HP-HIL device n vector address
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_VERSION_DESC (AX
=
0206H)
This subfunction returns the release date code and a double word pointer to the current version
number. The date code consists of two BCD coded bytes containing the year and week of
release. The BL register contains the number of years since 1960 and the BH register contains the
week of the year.
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_VERSION_DESC (06H)
BP
=
HP-HIL device n vector address
On Exit: AH
=
Return status code
BX
=
Release date code
CX
=
Number of byte in current version number
ES:DI
=
Pointer to the current version number
Registers Altered: AX, BX, CX, DI, ES, BP, DS
4.3.3.5 V_PNULL Driver (BP
=
OOOCH)
The null device driver is the default event driver routine. It is used when the physical device is not
recognized or the user event handler is not installed. It sets the AH register to RS_SUCCESSFUL
and does an IRET.
~
128 Input System and HP-HIL