HP Vectra Technical Reference Manual page 188

On Entry: AH
=
F_IO_CONTROL (04H)
AL
=
SF_SET_RAMSW (12H)
On Exit: AH
=
Return Status Code
"... Registers Altered:
AX,
BP, DS
SF_CLLRAMSW (AX
=
0414H)
This function clears the industry standard extended RAM
I I
switch" in the 8041 status register.
When this switch is off it indicates that the second 256K RAM bank is disabled. Since this can
never happen in the system this function should never be called.
On Entry: AH
=
F_IO_CONTROL (04H)
AL
=
SF_CLLRAMSW (14H)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_SET_CRTSW (AX
=
0416H)
This function sets the industry standard primary CRT "switch" in the 8041 status register. When
the switch is set it indicates the primary display is attached to the Multimode graphics adapter
(Default condition).
On Entry: AH
=
F_la_CONTROL (04H)
AL
=
SF_SET_CRTSW (16H)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
SF_CLLCRTSW (AX
=
0418H)
This function clears the industry standard primary CRT "switch" in the 8041 status register.
When this switch is clear it indicates the primary display is attached to the monochrome display
adapter.
Keyboard 179