HP Vectra Technical Reference Manual page 118

V_HPHIL Driver Function Definitions
F_ISR (AH
=
OOH)
This function is called by the V_S8259 driver to initiate processing of an interrupt from the HP-
HIL controller. This function reads input device data from the HP-HIL controller, generates one or
more ISR Event Records, and chains to V_SINPUT. THIS FUNCTION SHOULD ONLY BE CALLED
BY THE V_S8259 DRIVER.
On Entry: AH
=
F_ISR (OOH)
BP
=
V_HPHIL (0114H)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_INIT (AX
=
0200H)
This subfunction initializes the driver and HP-HIL controller. Refer to Section 9 for a complete
discussion of the protocol utilized in data space allocation ("Iast used DS" passed in register BX).
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_INIT (OOH)
BX
=
"Last used DS" in HP Data Area
BP
=
V_HPHIL (0114H)
On Exit: AH
=
Return Status Code
BX
=
New "Iast used DS" in HP Data Area
Registers Altered: AX, BX, BP, DS
SF_REPORT_STATE (AX
=
0204H)
This subfunction returns the current status of V_HPHIL.
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_REPORT_STATE (04H)
BP
=
V_HPHIL (0114H)
Input System and HP-HIL 109