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  Interrupt:   15h     Function:   87h
 
  Title:       Move Extended Memory Block
 
  Description:                                               [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 (GDT)
                                          If function unsuccessful
                                            Carry flag: set
                                            AH = Status
                                               = 01h (if RAM parity
                                                      error)
                                               = 02h (if exception
                                                      interrupt error)
                                               = 03h (if gate address
                                                      line 20 failed)
                                    -♦-