HP Vectra Technical Reference Manual page 140

On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
~
F_TRACK..-INIT (AH
=
04H)
This function sets the tracking driver to its default state. It determines the current video mode,
and initializes the tracking parameters.
On Entry: AH
=
F_TRACLINIT (04H)
BP
=
V_STRACK (005AH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
F_ TRACK..-ON (AH = 06H)
This function enables tracking. The sprite is displayed on the screen.
On Entry: AH
=
F_ TRACLON (06H)
BP
=
V_STRACK (005AH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
F_ TRACK..-OFF (AH = OSH)
This function disables tracking. The sprite is removed from the screen.
On Entry: AH
=
F_ TRACLOFF (OSH)
BP
=
V_STRACK (005AH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
Input System and HP-HIL 131