HP Vectra Technical Reference Manual page 54

F10_INQUIRE (AX = 6FOOH)
This subfunction determines whether or not the extended HP functions are available. If the
extended video functions are available, the BX register will be set to 4850H (which is the ASCII
characters 'HP').
On Entry: AX
=
F1 O_INQUIRE (6FOOH)
BX
=
Any value except 4850H CHP')
On Exit: BX
=
'HP' (4850H)
Registers Altered: AX, BX
This function returns information about the primary display adapter.
On Entry: AX
=
F10_GET_INFO (6F01H)
On Exit: AH
=
Status register information
,.
Bit Data Definition
0 1
Display Enabled.
1 1 Light Pen Trigger Set.
2
1 Light Pen Switch Made.
3
1
Vertical Synchronization
4 Monitor Resolution
0 350 or 400 line monitor
1 200 line monitor
5 Display type
0 Color
1
Monochrome
6-7 Diagnostic Bits
Video 45