EMM386 Exception Error #

 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.



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