DHX Driver Version 4.30.00 Release Notes
March, 2000

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                        Table Of Contents
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1. What’s New in DHX Driver 4.30.00 (versus 4.20)? 
2. System Requirements
3. Windows 2000 Support

1. What’s New in DHX Driver 4.30.00 (versus 4.20)?
--------------------------------------------------
*  Support for 1784-PKTX/A and 1784-PKTXD/A cards has been added.
   These cards provide the functionality of the 1784-KTX/KTXD cards
   on the PCI bus.

*  Configuration backup/restore of all DHX devices has been added.

*  Improved performance in polled mode of operation. The overall
   CPU load is lower.

*  Improved recovery from error conditions.

*  New DHX Driver Configuration editor. The DHX Driver
   Configuration editor is a common (shared) component of the DHX
   products. When configuring the driver for an adapter card
   device, the DHX Driver Configuration editor automatically
   dispatches the selected Adapter Card Configuration editor. Both
   editors are well-integrated, allowing for seamless editing.

   New features of the DHX Driver Configuration editor include:

   - a Remote Server Configuration Tab.

   - a Diagnostics Tab showing all DHX driver products installed
     on your system. Shortcuts to common diagnostic tools like
     DHX Demo, Event Viewer, and Performance Monitor are also
     provided.

   - Help buttons that display context sensitive help information.

   - a DHX Driver Control Tab in the Adapter Card Configuration
     editors that allows setting up the startup type and
	 monitoring the current driver status.

*  Improved on-line help.

*  The content of the on-line help is also provided in the PDF
   document format. This file can be used to print complete
   product documentation with good quality output. The PDF file
   can be viewed or printed using the Adobe Acrobat Reader
   program. A copy of Adobe Acrobat Reader is included on the
   product CD and can be installed from there.

*  Improved product install/uninstall.

*  Miscellaneous bug fixes.

2. System Requirements
----------------------
DHX Driver Version 4.30.00 requires Windows NT 4.0. Versions prior
to Windows NT 4.0 are no longer supported.

3. Windows 2000 Support
-----------------------
Windows 2000 introduced a number of architectural changes compared
to its predecessor, Windows NT 4.0. One of the major changes is the
introduction of the Windows Driver Model (WDM) for kernel mode
device drivers. This new model, based on the original Windows NT
driver model, introduces a number of new features, like Plug and
Play and Power Management support, which Windows NT 4.0 drivers
don't support.

The DHX Driver v4.30.00 is designed for Windows NT 4.0. However,
since Windows 2000 provides backward compatibility for Windows NT
drivers, the DHX Driver will also, in most cases, operate
successfully on a Windows 2000 system. The following three sections
describe the level of support and the differences in operation for
each adapter card type.

ISA Bus Adapter Cards
---------------------
All ISA bus adapter cards will operate successfully. This includes:

   - A-B 1784-KT Rev A
   - A-B 1784-KT Rev B
   - A-B 1784-KTCX
   - A-B 1784-KTX
   - SST 5136-SD Rev 1
   - SST 5136-SD Rev 2

These cards are non-Plug-and-Play and should be configured in the
same way as on a Windows NT 4.0 system.

PCI Bus Adapter Cards
---------------------
The PCI cards (such as 1784-PKTX/A and 1784-PKTXD/A) support
Plug-and-Play (PnP). Windows 2000 will detect them the first time
they are inserted into a system. When this happens, the operating
system will create a new device in the Device Manager under the
"DHX Devices for Allen-Bradley Networks" branch. Because the kernel
mode device driver component of the DHX Driver is unaware of this
new behavior, the card must still be manually configured using the
DHX Driver Configuration editor. Effectively, besides the initial
detection phase, the configuration and operation of the DHX Driver
for the PCI cards is identical to that under Windows NT 4.0.

PCMCIA Bus Adapter Cards
------------------------
Windows NT 4.0 support for the PCMCIA cards is incompatible with
Windows 2000. As a result, the 1784-PCMK (Series A and Series B)
will not operate in a Windows 2000 system. Contact Cyberlogic for
the availability of a Windows 2000 patch that will solve this
problem.
