HP Vectra Technical Reference Manual page 95

SF_ TRACLON (AX
=
0404H)
This subfunction turns tracking on. For each movement of the logical device, V_STRACK will be
called to update the graphics cursor (sprite) location.
On Entry: AH
=
F_la_CONTROL (04H)
AL
=
SF_ TRACie-ON (04H)
BP
=
V_LTABLET (OOBAH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_ TRACLOFF (AX
=
0406H)
This subfunction turns tracking off.
On Entry: AH
=
F_la_CONTROL (04H)
AL
=
SF_ TRACie-OFF (06H)
BP
=
V_LTABLET (OOBAH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_CREATE_EVENT (AX
=
0408H)
This subfunction establishes the routine to be called on logical device events. The IP, CS, and DS
of the routine are passed to this subfunction. These values are exchanged with the vector entry
of the V_EVENT_TABLET driver in the HP_VECTOR-TABLE, V_EVENT_TABLET being the
parent of the logical tablet driver. The IP, (5, and D5 of the previous routine are returned to the
caller. Note that this subfunction does not enable the event call to the parent routine; this must
be done explicitly using SF_EVENT_ON.
The ISR event records passed to the V_EVENT_TABLET driver will have one of the following
two formats depending on the data type stored in DL.
86 Input System and HP-HIL