HP Vectra Technical Reference Manual page 97

EVENT PROC FAR
CMP AH, F_ISR ,. only support function F_ISR
JE PROCESS_EVENT
MOV AH, RS_UNSUPPORTEO
IRET
PROCESS_EVENT:
,. code to process data (see
,. tablet event record)
MOV AH, RS_SUCCESSFUL
IRET
EVENT ENOP
,. return successful completion
MOV AH, F-'O_CONTROL
MOV AL, SF_CREATE_EVENT
MOV
BP, V_LTABLET
MOV
OX, OS
,. want
to
use the current data
,. segment for event OS
PUSH CS
POP ES ,. current CS is also segment
,. of event routine
LEA 51, CS:EVENT ,. get the
IP of the event
,. routine
PUSH OS ,. save current
OS
INT
HP_ENTRY
,. call extended
BIOS driver
POP OS
SF_EVENT
_ON (AX = 040AH)
This subfunction enables the event (parent) call to the tablet event routine (V_EVENT_TABLED.
The link to the tablet event routine must have already been established using
SF_CREATE_EVENT.
On Entry: AH
=
F_IO_CONTROL (04H)
AL
=
SF_EVENT_ON (OAH)
BP
=
V_LTABLET (OOBAH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
Related Functions: SF_CREATE_EVENT, SF_EVENT_OFF
88 Input System and HP-HIL