INT 10H 1c00H: VGA Query Size of State-Save Buffer

                                                          Compatibility: VGA 
 Expects: AX    1c00H
          CX    type(s) of video-state info expected to be saved (see below)
 Returns: AL    1cH (if this fn is supported)
          BX    size of save-state buffer, in 64-byte blocks
    Info: Use this fn before calling INT 10H 1c01H (save video state).  It
          lets you know how much memory will be needed to save the
          specified video state information.

       CX is a set of bit-flags indicating what types of video-state
          information you need to save:
           1 1
          ╓5┬4┬  ┬7┬6┬5┬4┬3┬2┬1┬0╖
          ║0 0•••│0 0 0 0 0│cdh║
          ╙─┴─┴  ┴─┴─┴─┴─┴─┴╥┴╥┴╥╜ bit mask
                            ║ ║ ╚═► 0: 01H  video hardware state info
                            ║ ╚═══► 1: 02H  video BIOS data area info
                            ╚═════► 2: 04H  DAC state and color registers

See Also: INT 10H 1cH (VGA Save/Restore Functions)
          INT 10H: Video Services
          EGA/VGA Data Areas