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 c d h 
                         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)
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INT 10H 1c00H: VGA Query Size of State-Save Buffer