AutoCAD 386 and Windows 3.0 (63680)
The information in this article applies to:
- Microsoft Windows 3.0
- Microsoft Windows 3.0a
This article was previously published under Q63680 SUMMARY
AutoCAD 386 runs with Microsoft Windows version 3.00 in real mode only.
This is because AutoCAD 386 uses VCPI (virtual control program interface)
to access extended memory that comes into conflict with Windows in
protected, standard, and enhanced mode.
MORE INFORMATION
The VCPI specification allows MS-DOS applications to directly access
extended memory on 80386 machines. Windows 3.0 uses the DPMI (DOS protected-
mode interface) specification. The DPMI specification allows DOS
applications to directly access memory on 80286 and 80386 machines. Not all
programs that use the VCPI specification are limited to running with
Windows in real mode. Many programs, including Lotus 1-2-3 version 3.0,
that use the VCPI specification run correctly in Windows protected mode.
The performance of an MS-DOS application that uses the VCPI specification
depends on how closely the actual application follows the VCPI
specification.
NOTE: When running AutoCAD under Windows 3.0 in standard mode, erratic
functioning can occur. It is therefore recommended that you do not run
AutoCAD while running in standard mode.
The AutoCAD product included here is manufactured by a vendor independent
of Microsoft; we make no warranty, implied or otherwise, regarding this
product's performance or reliability.
| Modification Type: | Minor | Last Reviewed: | 7/7/2005 |
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| Keywords: | KB63680 |
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