KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q38317: CodeView Gives "Illegal Instruction" on Clone 386

Article: Q38317
Product(s): See article
Version(s): 2.20
Operating System(s): MS-DOS
Keyword(s): ENDUSER | CV | mspl13_basic
Last Modified: 23-NOV-1988

Some clones that are not entirely IBM-compatible under CodeView may
give an "illegal instruction" message upon executing Go (F5), and then
hang, requiring a warm boot. If the instruction being called illegal
is FINIT or FNINIT, the particular ROM BIOS probably has a built-in
387 emulator. Either turn off the emulator, or set the environment
variable SET NO87=(some string).

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.