Mylex 80486 EISA Motherboard and MS-DOS 5.0/6.0/6.2 (77178)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
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
error occurs. The only way to recover from this error is with a
• When running Memmaker from MS-DOS 6.0, the following error message
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
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.
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