a:\sco\readme.txt                        02-JUN-1997

This readme.txt file is covers the SCO Unix MDI device 
driver for Digital's EtherWORKS 100Mb adapters, based on 
Digital's DC21X4 controllers.

This file contains information on the following topics:

        1. Overview
        2. Hardware and Software Requirements
        3. Installation
        4. Parameters
        5. Troubleshooting

************
* OVERVIEW *
************

        This driver is currently supported for the 
        following devices:
                 
        Digital DE500 Fast EtherWORKS PCI  10/100 Adapter  
        (XA, AA, BA, FA)
                      
        The DE500, will autonegotiate a link if an IEEE802.3u auto 
        negotiable partner is available, otherwise it will perform 
        DIGITALs patented 10/100 autosense routine to determine if 
        the Adapter is attached to 10 or 100 Mb/s Ethernet.  The 
        driver will autosense at boot time and at run time. 

        If the driver cannot sense a particular line speed, it will 
        assume that the line is not connected, and auto select 
        10Mb/s.

        When connected point to point (DE500 to DE500), the driver 
        will auto select 100Mb/s.  If the DE500 is attached to an 
        N-Way device, the driver will auto select the highest common 
        mode.

        The only exception is the DE500-FA adapter.  The DE500-FA 
        adapter is a 100Mb/s-only card, and therefore is incapable
        of negotiation. The link attributes must be set by the user
        when the driver is configured into the system.  On older
        versions of OpenServer (pre-5.0.4 release), the DE500-FA 
        may appear as a generic DE500 adapter and offer AUTO, HDX_10 
        and FDX_10 as well as HDX_100 and FDX_100.  Only the HDX_100 
        and FDX_100 media settings are valid for the DE500-FA.

        This SCO MDI Driver is designed to work on the new SCO 
        OpenServer Release 5.0.* OS, but is not backwards compatible 
        to the older SCO Open Desktop Release 3.0 and earlier 
        operating systems.  Installation using the Software Manager 
        is straight forward and should not present any problems nor 
        error messages.

**************************************
* HARDWARE AND SOFTWARE REQUIREMENTS *
**************************************

   A.  Hardware Requirements:

         o An IBM-compatible personal computer with 80386 or higher
           microprocessor and a PCI bus with an available bus mastering PCI 
           slot.

   B. Firmware Requirements:

         o Fully compliant Rev. 2.0 or above PCI BIOS must be 
           supplied with the PC 

   C.  Software Revision Requirements:

         o Operating System:
               SCO OpenServer Release 5.0 operating system
         o Adapter driver distribution disk if using SCO OpenServer 
           Release 5.0 

****************
* INSTALLATION *
****************

   To install the SCO Unix MDI Device Driver:

    -   Run the Software Manager, select the 'Softare->Install New' 
        menu item and follow the on-screen popup dialog boxes for 
        instructions.  The distribution media is the floppy disk 
        supplied with the adapter.

    -   Alternatively, ftp the binary distribution file to your
        system.  Rename it "/tmp/VOL.000.000/VOL.000.000". Run the
        Software Manager, selecting "Media Images" as the distribution
        media.  When prompted for the directory, enter "/tmp/VOL.000.000".
        Proceed as above.

    -   Run the Network Configuration Manager, select 
        'Hardware->Add New LAN Adapter' menu item and follow the 
        on-screen popup dialog boxes for instructions. Relink the 
        kernel on exiting this utility.

    -   To activate the adapter, you must reboot. When the system 
        boots, you should see a message similar to the following 
        message among the other configuration messages:

    %dcx0  0x2000-0x2200  5 - type=DE500-AA addr=12:34:56:78:9a:bc

        with the appropriate I/O addresses, IRQ, adapter type and 
        IEEE address.



*******************
* TROUBLESHOOTING *
*******************

  o MDI Driver

      No problems reported to date with this latest release (V1.0.5).