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  Service 89H (decimal 137) is provided by the ROM BIOS as an aid to
  configuring an 80286-based computer (PC/AT, PS/2 Model 50 or 60) or an
  80386-based computer (PS/2 Model 80) for protected-mode operation. This
  ROM BIOS service is intended for operating systems that run in protected
  mode. To use this service, you must be thoroughly acquainted with
  protected-mode programming techniques. See the IBM BIOS Interface
  Technical Reference Manual for details.