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1993-11-16
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DOCUMENT:Q103323 04-NOV-1993 [W_NT]
TITLE :I/O Channel Ready Settings on the Intel EtherExpress 16
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
-----------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
-----------------------------------------------------------------------
SUMMARY
=======
When you install the driver for the Intel EtherExpress 16 local area
network adapter, one of the configuration fields is I/0 Channel Ready.
This option can have three possible values: Late, Early, and Never.
Typically, Windows NT will only allow the user to set this field to
Later or Never.
MORE INFORMATION
================
The I/O Channel Ready settings optimize the timing of 16-bit data
transfers. The Never value forces the card into 8-bit mode; the Late
and Early values both allow the card to work in 16-bit mode. The
setting that works on most computers is Late, although a few computers
require Early to function in 16-bit mode.
Some computers will experience problems when the card is set to Early.
These problems can range from data loss when transferring large files
to computer hangs that require removing the card, transferring it to
another computer and using the Softset utility to reset the network
adapter. Because of the potential for serious problems, Windows NT
setup does not offer Early as one of the options unless one of the
following is true:
- Setup detects that the card is already set to Early.
-or-
- The .INF file for the Intel EtherExpress has been modified to allow
the early setting.
Even when the Early option is available, if you select it, you will
receive the following error message:
Use of the Early setting may cause system failure in some machines.
Are you sure you want to continue?
While those computers that require Early will not function when the
card is set to Late, the EtherExpress driver is capable of detecting
this case and it will default the card to Never, which is always safe.
Unfortunately, there is no way to detect when Early is not safe
without experiencing the problems mentioned above.
If you have a computer that requires the Early setting and it is not
displayed as an option in Windows NT, you can add Early to the list by
doing the following:
1. Open the OEMNADIN.INF file in the %systemroot%\SYSTEM32
subdirectory with a text editor.
2. Find the line that reads "AllowEarly =" and change the value after
the equal sign from 0 to 1.
3. Save the file.
4. Use the network applet in Control Panel to configure the network
adapter settings. Early should then show up as an option for
I/O Channel Ready.
Additional reference words: 3.10 ether express
KBCategory:
KBSubCatergory: stp devdrvr
=============================================================================
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 1993.