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Article ID: 77178 - Last Review: May 12, 2003 - Revision: 2.0
Mylex 80486 EISA Motherboard and MS-DOS 5.0/6.0/6.2
This article was previously published under Q77178
If you have a Tangent machine with a Mylex 80486 EISA motherboard, you
may experience erratic behavior when using Microsoft MS-DOS version
5.0 or 6.0, especially when using the Mylex DCE cache controller.
Symptoms include the following:
- Machine stops responding (hangs).
- You can't access directories.
- You can't access the hard drive.
- Your file allocation table (FAT) may be corrupt.
The following application-specific problems have also been experienced
with this configuration:
- With MS-DOS 5.0 or 6.0 and Windows 3.0, erratic inability to find
COMMAND.COM when exiting Windows.
- With Edit, QBasic, and 101-key keyboards, dedicated cursor keys
operate as if the SHIFT key has been pressed (that is, they select
blocks rather than moving the cursor).
- With EMM386.EXE, when attempting to use CTRL+ALT++ or
CTRL+ALT+- to change the processor speed, an
ILLEGAL INSTRUCTION : SYSTEM HALTED
- When running Memmaker from MS-DOS 6.0, the following error message
is displayed:
Illegal Instruction Trapped
Mylex has confirmed this to be a problem with the Mylex 80486 EISA
motherboard. In addition, Mylex has confirmed that the Northgate/Mylex
80486 EISA motherboard with BIOS version 6.04q is not compatible with
EMM386.EXE. The newest revision is 6.15, which is compatible with
EMM386.EXE.
Contact Mylex for additional information or a BIOS upgrade.
The product included here is manufactured by vendors independent of
Microsoft; we make no warranty, implied or otherwise, regarding this
product's performance or reliability.
APPLIES TO
- Microsoft MS-DOS 5.0 Standard Edition
- Microsoft MS-DOS 5.0a
- Microsoft MS-DOS 6.0 Standard Edition
- Microsoft MS-DOS 6.2 Standard Edition
- Microsoft MS-DOS 6.21 Standard Edition
- Microsoft MS-DOS 6.22 Standard Edition
Retired KB Content DisclaimerThis article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
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