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- DOCUMENT:Q101955 04-NOV-1993 [W_NT]
- TITLE :80287 Emulation Limitations for 16-Bit Applications
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- ----------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system, version 3.1
- - Microsoft Windows NT Advanced Server, version 3.1
- ----------------------------------------------------------------------
-
- 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 reference words: 3.10
- KBCategory:
- KBSubCategory: HRDWR 16AP
-
- =============================================================================
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- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
- EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
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- CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
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- POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
- OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
- SO THE FOREGOING LIMITATION MAY NOT APPLY.
-
- Copyright Microsoft Corporation 1993.