INT 10H 1c02H: VGA Restore Video State

                                                          Compatibility: VGA 
 Expects: AX    1c02H
          CX    type(s) of video-state info to restore (see below)
          ES:BX address of buffer containing video-state info
          ──────────────────────────────────────────────────────────────────
 Returns: AL    1cH (if this fn is supported)
          ──────────────────────────────────────────────────────────────────
    Info: This restores the VGA video system to its state at the time when
          it was saved via INT 10H 1c01H.

       CX is a set of bit-flags indicating what types of video-state
          information you need to restore:
           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

    ES:BX Be sure that the data at this address contains valid information
          as saved via INT 10H 1c01H (with CX having the same value!).

          The layout of the video-state information is not documented.

   Notes: This is very handy for task-switching software such as the DOS
          Shell and can be useful in systems that switch in-and-out of
          graphics modes.

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