VgaFlagsRec

  The byte at 0040:0089 in the BIOS Data Area is a set of bit flags
  containing information pertaining to the status of the VGA▲.

 VgaFlagsRec
 ╓7┬6┬5┬4┬3┬2┬1┬0╖
 ║r│s│0│r│p│m│g│a║           0040:0089 -- VGA Miscellaneous Flags
 ╙╥┴╥┴─┴╥┴╥┴╥┴╥┴╥╜ bit mask
  ║╔║═══╝ ║ ║ ║ ╚═►  0: 01H  VGA is active; 0=VGA is disabled/inactive
  ║║║     ║ ║ ╚═══►  1: 02H  gray-scale summing is enabled; 0=disabled
  ║║║     ║ ╚═════►  2: 04H  using monochrome monitor; 0=color display
  ║║║     ╚═══════►  3: 08H  default palette loading; 0=keeps same colors
  ║║╚═════════════►  5: 20H  DCC display switching enabled; 0=not enabled
  ╚╩══════════════►7,4: 90H  text mode scan lines (bits 7 and 4 together)
                             bit7  bit4  masked
                               0    0     00H    350-line mode
                               0    1     10H    400-line mode
                               1    0     80H    200-line mode
                               1    1     90H    (reserved)
See Also: EGA/VGA Data Areas
          BIOS Data Area
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