IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, you should first make a backup copy of the
registry files (System.dat and User.dat). Both are hidden files in the
Windows folder.
CAUSE
Some programs (such as QEMM Stealth and EMM386.EXE with the /HIGHSCAN
switch) map over part of the BIOS. If RAM has been mapped over the EISA
BIOS, your computer may hang when Windows calls the BIOS.
Windows 95 calls an EISA BIOS in one of two ways:
- Using INT 15.
- With a direct call to a published entry point.
By default, Windows calls the BIOS directly rather than by using INT 15.
RESOLUTION
Windows 95 attempts to detect cases of RAM mapping so that it can change
the way it calls the EISA BIOS. For example, if Windows 95 detects QEMM
Stealth it calls the BIOS by simulating INT 15. To do this, Windows adds
an EISASimulateInt15 entry to the registry and gives the entry a value of
- The default value, 00, means that Windows
communicates with the EISA
BIOS directly.
If you suspect that your computer is hanging because of the way Windows is
accessing the BIOS, add EISASimulateInt15 to
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\System
in the registry and give it a value of 00 or 01. A value of 00 causes
Windows to call the BIOS directly, and a value of 01 causes Windows to
simulate INT 15 to call the BIOS.
NOTE: For information about how to edit the registry, view the Changing
Keys And Values online Help topic in Registry Editor (Regedit.exe). Note
that you should make a backup copy of the registry files (System.dat and
User.dat) before you edit the registry.
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall Windows 95. Microsoft cannot guarantee that
problems resulting from the incorrect use of Registry Editor can be solved.
Use Registry Editor at your own risk.