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  Description:  Get Address of Extended BIOS Data Area      [PS/2]
 
  Returns the segment address of the base of the extended BIOS data area.
 
  Input             Output
  ══════            ═════════════════════════════════════
  AH=C1H            If function successful
                    Carry flag=clear
                    ES=segment of extended BIOS data area
                    If function unsuccessful
                    Carry flag=set
                                    -♦-