HelpPC 2.10 Quick Reference Utility 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

Esc or Alt-X to exit int 10,12 Home/PgUp/PgDn/End ←↑↓→