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  Description:  Get Configuration Information      [EGA] [VGA]
 
  Obtains configuration information for the active video subsystem.
 
  Input             Output
  ══════            ════════════════════════════════
  AH=12H            BH=display type
  BL=10H               0H if color display
                       1H if monochrome display
                    BL=memory installed on EGA board
                       00H if 64 KB
                       01H if 128 KB
                       03H if 256 KB
                    CH=feature bits (see Notes)
                    CL=switch setting (see Notes)
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