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  Description:  Get Functionality/State Information      [PS/2]
 
  Obtains information about the current display mode, as well as a pointer
  to a table describing the characteristics and capabilities of the video
  adapter and monitor.
 
  Input                                          Output
  ══════════════════════════════════════         ═══════════════════════════
  AH=1BH                                         If function supported
  BX=implementation type (always 00H)            AL=1BH
  ES:DI=segment:offset of 64-byte buffer         and information placed in
                                                 caller's buffer (see Notes)
                                    -♦-