HP Vectra Technical Reference Manual page 59

Programmers must exercise caution when setting video modes with both F10_SET_MODE (OH)
and F10---><SET_MODE (6F05H). Whenever F1 O---><SET_MODE is used to select one of the "HP
only" modes (8-15), F10---><SET_MODE (not F1 O_SET_MODE) must be used to return to one
of the industry standard modes (0-7). This "pairing" of function calls is necessary because
F1 O---><SET_MODE modifies an I/O port not normally affected by the industry standard modes.
F1 O_SET_MODE does not deal with this I/O port.
~
On Entry: AX
=
F1 O---><SET_MODE (6F05H)
BL
=
Video mode
Data Definition
OOH 40
x
25 Alphanumeric Black and White
01 H 40 X 25 Alphanumeric Color
02H 80
X
25 Alphanumeric Black and White
03H 80
X
25 Alphanumeric Color
04H 320
X
200 Graphics Color
05H 320
X
200 Graphics Black and White
06H 640
X
200 Graphics Black and White
07H 80
X
25 Only Valid for Monochrome Cards
08H 80
X
27 Alphanumeric Black and White
09H 80
X
27 Alphanumeric Color
OAH 40
X
27 Alphanumeric Black and White
OBH 40 X 27 Alphanumeric Color
OCH Reserved
ODH 640
X
400 Graphics Black and White
OEH 320 X 400 Graphics Color
OFH 320
X
400 Graphics Black and White
On Exit: No values returned.
Altered Registers: AX, BL
Example:
MOV AX,Fl0-XSET_MODE ,. Call EX-BIOS function
,. Set mode (6F05H)
MOV BL,ODH ,. Select 640
X
400 line mode
INT INT_VIDEO ,. Call video interrupt (10H)
50 Video