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  Description:  Move Extended Memory Block      [AT] [PS/2]
 
  Transfers data between conventional memory and extended memory.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════════
  AH=87H                                    If function successful
  CX=number of words to move                Carry flag=clear
  ES:SI=segment:offset of Global            AH=00H
                Descriptor Table            If function unsuccessful
                (see Notes)                 Carry flag=set
                                            AH=status
                                               01H if RAM parity error
                                               02H if exception interrupt
                                                   error
                                               03H if gate address line 20
                                                   failed
                                    -♦-