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Copyright 1991 David Jurgens |
INT 10,12 - Video Subsystem Configuration (EGA/VGA)
AH = 12h
BL = 10 return video configuration information
on return:
BH = 0 if color mode in effect
= 1 if mono mode in effect
BL = 0 if 64k EGA memory
= 1 if 128k EGA memory
= 2 if 192k EGA memory
= 3 if 256k EGA memory
CH = feature bits
CL = switch settings
BL = 20 select alternate print screen routine
BL = 30 select scan lines for alphanumeric modes
AL = 0 200 scan lines
= 1 350 scan lines
= 2 400 scan lines
on return:
AL = 12
BL = 31 select default palette loading
AL = 0 enable default palette loading
= 1 disable default palette loading
on return:
AL = 12
BL = 32 CPU access to video RAM
AL = 0 enable CPU access to video RAM and I/O ports
= 1 disable CPU access to video RAM and I/O ports
on return:
AL = 12
BL = 33 Gray scale summing
AL = 0 enable gray scale summing
= 2 disable gray scale summing
on return:
AL = 12
BL = 34 cursor emulation
AL = 0 enable cursor emulation
= 1 disable cursor emulation
on return:
AL = 12
BL = 35 PS/2 video display switching
AL = 0 initial adapter video off
= 1 initial planar video on
= 2 switch active video off
= 3 switch inactive video on
ES:DX pointer to 128 byte save area (when AL = 0, 2 or 3)
on return:
AL = 12
BL = 36 video refresh control
AL = 0 enable refresh
= 1 disable refresh
on return:
AL = 12
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| Esc or Alt-X to exit |
int 10,12 |
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