ID: Q86906
The information in this article applies to:
The Extended Version of FoxPro version 2.0 can run on 386 and 486 computers with a minimum of 1.5 megabytes (MB) of extended memory. Use the Standard Version if less than 1.5 MB of extended memory is installed.
FoxPro will achieve better performance when the system has at least 2 MB extended memory installed.
Extended FoxPro is incompatible with Microsoft Windows operating system versions 3.0 and 3.1 running in 386 enhanced mode.
The Extended Version of FoxPro can use extended memory or expanded memory; however, it cannot use both simultaneously. If some extended memory is configured as expanded memory, FoxPro will access only the expanded memory.
FoxPro Extended Version (X) uses a modified version of the Ergo OS386 MS-DOS Extender to run in protected mode on a 386 computer. The MS-DOS Extender can operate in a variety of environments. When it starts, it checks for the following memory environments in the following order:
1. A DPMI (MS-DOS Protected Mode Interface) server
Enhanced mode Windows 3.0 and 3.1 are DPMI servers. Because Ergo
OS386 does not support DPMI, FoxPro (X) does not load if a DPMI
server is detected.
EMM386.EXE provided with MS-DOS 5, EMM386.EXE provided with Windows
3.0 or 3.1, 386MAX and BlueMax from Qualitas, QEMM-386 from
QuarterDeck, and CEMM from COMPAQ are all VCPI servers.
HIMEM.SYS from Microsoft, HIMEM.SYS from COMPAQ, 386MAX and BlueMax
from Qualitas, and QEMM-386 from QuarterDeck are XMS drivers.
In this case, the OS386 calls Interrupt 15h directly to allocate
and use extended memory.
For more information, see pages 15-6 through 15-9 of the "Microsoft FoxPro Developer's Guide."
The servers and drivers listed above are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.
Additional reference words: FoxDos 2.00 3.00 3.10 KBCategory: kbenv kb3rdparty KBSubcategory:
Last Reviewed: April 17, 1995