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TT-98.003
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1991-08-26
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781b
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27 lines
American Megatrends, Inc.
Tech Tip #98.003
02/12/91
Problem:
When EMM386 driver is used with DOS 4.01, it gives the following
error on a soft reset:
EMM386 Exception Error # ....
Press Enter to Reboot
Solution:
When EMM386 drier is loaded, it switches the system to protected
mode. When a soft boot is done, DOS should first switch back to
the real mode, and then give control to the BIOS for soft reset.
This is done because I/O instructions cannot be executed in
protected mode (most BIOS calls are I/O operations).
In DOS 4.01, the operating system does not switch to real mode
before giving control to the bios, this causes the EMM386 Exception
error.
Microsoft has acknowledged this problem, and should fix it in the
next release of DOS.