HP Vectra Technical Reference Manual page 81

On Entry: AH
=
F_IO_CONTROL (04H)
AL
=
SF_CLIPPING_OFF (1 OH)
BP
=
V_LTOUCH (OOC6H)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
F_SAMPLE (AH = 06H)
This function allows an application to poll the touch screen device. This function reports the
current absolute position of the logical device in a form similar to a Logical ISR Event Record.
On Entry: AH
=
F_SAMPLE (06H)
BP
=
V_LTOUCH (OOC6H)
On Exit: AH
=
Return Status Code
BX
=
Current logical position along X axis
CX
=
Current logical position along Y axis
DL
=
LD_TRANSITION field of Logical Describe Record
DH
=
LD_STATE field of Logical Describe Record
ES:O
=
Pointer to logical device header and Describe Record
Registers Altered: AX, BX, CX, DX, BP, DS, ES
The following is an example of how to call the F_SAMPLE function.
MOV AH, F_SAMPLE
MOV BP, V.-LTOUCH
PUSH OS
/NT HP_ENTRY
POP OS
,. load function code
,. load vector address
,. save the current OS
,. call extended
B/OS
driver
,. restore OS
4.2.3.2 V_LPOINTER Driver (BP
=
OOCOH)
This section contains a detailed description of the pointer driver. Table 4.7 summarizes the
functions supported
by
this driver.
72 Input System and HP-HIL