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Microsoft KB Archive/101955

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Knowledge Base

80287 Emulation Limitations for 16-Bit Applications

Article ID: 101955

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1

This article was previously published under Q101955


The 80287 emulation provided for support of 16-bit applications is limited in range to the support provided by the MIPS R4000 FPU. Thus there is a small range of numbers at the extreme ranges of the 80287's available numbering system that are not usable under the provided emulation.

These are the supported ranges:

                   Maximum                  Minimum
                   -------                  -------
Short real         3.40282e+38              1.17549e-38
Long & temp real   1.797631+308             2.22507e-308

NOTE: The R4000 FPU does not support temp real format. Temp real arithmetic on the emulated 80287 is performed as long real. The 80287's temp real format extends beyond these supported ranges, and therefore some applications may use numbers outside the above range to derive user-entered numbers. This can add an additional restriction to the above. For example, in Microsoft Access, the smallest long real (double) value that Microsoft Access accepts is 1e-301.

Additional query words: prodnt

Keywords: kbhardware KB101955