HP Vectra Technical Reference Manual page 139

V_STACK Driver Function Definitions
F_ISR (AH
=
OOH)
This function is called to move the sprite to a new location. The display under the sprite is
~
restored, and the sprite is redisplayed in its new location. The hot spot of the sprite is placed at
the coordinates passed in BX and CX.
On Entry: AH
=
F_ISR (OOH)
BX
=
X coordinate of sprite
CX
=
Y coordinate of sprite
DL
=
Source vector index
BP
=
V_STRACK (005AH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_INIT (AX
=
0200H)
This subfunction is called to initialize the driver. 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_STRACK (005AH)
On Exit: AH
=
Return Status Code
BX
=
New "last used DS" in HP Data Area
Registers Altered: AX, BX, BP, DS
SF_START (AX
=
0202H)
This subfunction is called to start the tracking driver.
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_START (02H)
BP
=
V_STRACK (005AH)
130 Input System and HP-HIL