Memory Management in FoxPro 2.0 and 2.5 for MS-DOS

Last reviewed: April 17, 1995
Article ID: Q93627

The information in this article applies to:

Microsoft FoxPro for MS-DOS, versions 2.5 and 2.5a

FoxPro 2.5 and 2.5a for MS-DOS use the MS-DOS Protected Mode Interface (DPMI) for their memory management while FoxPro 2.0 for MS-DOS uses the Virtual Control Program Interface (VCPI) for its memory management. This change enables the extended version of FoxPro 2.5 to run in an MS-DOS window under Microsoft Windows versions 3.0 or 3.1.

DPMI is an industry standard for MS-DOS extender applications. A DPMI application can run in protected mode and use more than 640K of memory in the standard (80286 compatible) and 386 enhanced modes of the Intel 80386 microprocessor. The DPMI specification is available from Intel Corporation.

VCPI is a memory-management specification developed by Phar Lap Software and other vendors for the 80386 microprocessor.

Additional reference words: FoxDos 2.50 2.50a
KBCategory: kbprg
KBSubcategory:

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE 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.

Last reviewed: April 17, 1995
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.