Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function C1h
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  Interrupt:   15h     Function:   C1h
 
  Title:       Get Address of Extended BIOS Data Area
 
  Description:                                                   [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
                                    -♦-