.       XIRCOM REALPORT CARDBUS ETHERNET 10/100 + MODEM 56
.           XIRCOM CARDBUS ETHERNET 10/100 + MODEM 56 
.              Software Release Version 2.53               
.                       June 3, 1999 
======================================================================

The driver software in this release works with the following
Xircom products:

 Product Name				              Model Number
 ------------					      ------------
 Realport CardBus Ethernet 10/100 + Modem 56 	      RBEM56G-100
 CardBus Ethernet 10/100 + Modem 56  		      CBEM56G-100

 
CONTENTS
--------

    1)  Hardware Specific Notes
    2)  Release Notes/Known Limitations
    3)  What's new in the 2.53 Release
    4)  Using RBEM/CBEM in Windows 95
    5)  Notes on Card Services
    6)  Installing the NDIS3 or NDIS4 driver in 
        Win95 OSR2, 98 and NT 4.0
    7)  CardBus Equipped Portable Computers
    8)  Creating a Disk Install
    9)  Xircom Customer Support



1)  HARDWARE SPECIFIC NOTES
    =======================
     
    Dell Latitude LT
    ----------------
    -Under Windows NT 4.0, the network interrupt must be changed to 9
     and the modem Com port must be changed to 4.  Refer to the QSG
     for installation instructions. 

    Dell machines with C/port and C/dock Docking Stations
    -----------------------------------------------------
    -These docking stations must be installed and configured before
     the CBEM adapter is installed.

    Dell Latitude and Inspiron Series
    ----------------------------------
    If problems with are encountered with the Xircom RBEM/CBEM after installation
    please reset the system BIOS to it's default configuration.    

  
    
2)  RELEASE NOTES/KNOWN LIMITATIONS
    ===============================
   
    Supported Environments
    ----------------------    
    
    Driver Name   Description
    -----------   -----------

    CBE.SYS       NDIS3 Driver for Microsoft Windows 95 (OSR2), 
                  Windows 98 and Windows NT 4.0.
    CBEN4.SYS	  NDIS4 Driver for Microsoft Windows 95 (OSR2), 
                  Windows 98 and Windows NT 4.0.
    CBMFFIX.EXE   CBEM configuration program for Windows 95 OSR2 only.
    CBMODEM.SYS   Modem enabler for Windows NT 4.0.
    CBEN5.SYS	  NDIS5 Driver for  Windows 98 and current 
                  Windows 2000 Beta Releases.
    CBENT.SYS     NDIS4 Driver for use with NT 4.0 Card and Socket 
                  Services, specifically the Softex PC Card Controller.    
    CBMODEMN.SYS  Modem enabler for use with NT 4.0 Card and Socket 
                  Services, specifically the Softex PC Card Controller.
    CBMODEM.COM   Modem enabler for DOS/Win 3.X
    CBENDIS.EXE   NDIS2 Driver for Windows 3.X supporting 
                  LAN MANAGER, and MS DOS Client ver 3.0 
    CBEDIAG.EXE   Windows Diagnostic Test Program (Windows 95 OSR2, 
                  98 and NT only)
    MDMTEST.EXE   32 bit Windows based modem test utility (Windows 95 
                  and 98)
    COMSEL.EXE    Xircom Com Port Select Utility (Windows 95 OSR2, 98 only)
    TELSEL.EXE    Xircom Country Select Utility.

    Com Port Assignment in Windows 95 OSR2 and 98
    ---------------------------------------------
    -Windows 95/98 may assign the modem to Com5.  Windows applications
     supporting TAPI support the use of Com5.  If you have an 
     application which does not support the use of Com5, the Xircom 
     Com Port Select Utility can be used to change the Com port 
     assignment in Windows 95/98.  It will allow you to select an 
     unassigned com port for use with RBEM/CBEM.  The Com Select 
     Utility is added to the Xircom program group during Utility 
     installation. The Com Port Select Utility is not supported under 
     Windows NT. 

    V.90 configuration and use information - S109 register
    ------------------------------------------------------

    Current released firmware for Xircom 56K modem products now 
    includes support for the v.90 56K modem standard. This firmware is 
    designed to initially attempt to make a v.90 connection, and then 
    fall back to K56flex if the host being dialed does not support 
    v.90.  However, the host being dialed must support v.90 autodetect 
    in order for a v.90 connection to be initiated by default.  At this 
    point in time many v.90 hosts do not yet support autodetect.  In 
    such cases it will be necessary to issue an ATS109=2 command to 
    the modem in order to force a v.90 connection.
 
    Please note that if this command is used and a v.90 connection is 
    not achieved the modem will fall back directly to v.34.  When 
    S109=2, fall back from v.90 to K56Flex is disabled.  To set this 
    value back to the default issue an ATS109=1 command. 

    In summary, the values of this register and the resultant behavior
    are:

    S109=1 (default) - Negotiates initially at v.90 if host supports
                       v.90 autodetect.  If host does not support 
                       v.90 autodetect or does not support v.90 at
                       all, will negotiate back to K56flex.
    S109=2           - Forces v.90 for PCM connects.  If host does not
                       support v.90, falls directly back to v.34.

    Changing the value of the S109 register can be implemented via the 
    following means:

    -When using a terminal emulator program, enter ATS109=n (where n 
     is the value desired).
    -To implement with Windows 95/98/NT dial up networking, go to
     Control Panel\Modems.  Highlight the Xircom modem and click 
     Properties.  Click Connection\Advanced. Enter S109=n (where n is
     the value desired) in the Extra Settings box.

    Known Limitations    
    -----------------

    -Under Windows 95 OSR2, no other card can be inserted into the 
     slot into which CBEM was installed, without removing the forced 
     configuration.  Refer to the previous section titled "Removing the
     forced Configuration" for instructions.  Additionally, CBEM 
     should not be installed into the other slot without removing the
     forced configuration.
 
    -Windows 95 may fail to load RBEM when Windows 95 comes out of 
     Suspend/Resume.  To make RBEM load in this situation, click on
     the PC Card icon in the System Tray (or in Control Panel), click
     Stop, eject RBEM and then re-insert it. RBEM will now load.
  
    -The Xircom CardBus Ethernet 100 + Modem 56 is designed to 
     connect to a 100Base-TX network.  It currently does not support
     100VG-AnyLAN networks.     

    Modem Script Files
    ------------------
    -Modem script files for popular applications can be found in 
     the \SCRIPTS directory on the CD-ROM.  See scripts.txt in this
     directory for details on using script files with the CBEM.


3)  WHAT'S NEW IN THE 2.53 SOFTWARE DRIVER RELEASE
    ==============================================
    -Includes the Xircom Com Port Utility, a Windows 95 (OSR2)/98 
     program which changes the Com Port Assignment for RBEM/CBEM.  See 
     Section 5 below for further information.

    -Use of network disabled hardware profiles in Windows NT 4.0 is
     supported.

      
4)  USING RBEM/CBEM IN WINDOWS 95
    ========================

    Using RBEM in Windows 95 versions 950 and 950A
    ----------------------------------------------
    The software in this release DOES NOT include support for Windows 
    95 versions 950 and 950A.  Only Version 4.00.950B is supported

    Xircom Enhancements for Windows 95 OSR2 (950B)
    ----------------------------------------------
    Windows 95 version OSR2 (950B) and later support Plug and Play of 
    CardBus devices.  However, OSR2 may have problems properly 
    allocating resources to CardBus multifunction (Ethernet + Modem) 
    devices.  RBEM includes software which enhances the ability of 
    Windows 95 OSR2 to support CardBus multifunction devices.  This 
    support is implemented in the NDIS3/NDIS4 drivers (CBE.SYS/
    CBEN4.SYS) and CBMFFIX.EXE.

    CBMFFIX.EXE is a Xircom program that helps Windows 95 OSR2 
    configure and use RBEM.  It is launched automatically at the end 
    of the adapter's installation.  The only indication that it has 
    run will be a dialog box telling the user to reboot to complete
    the installation.

    On some machines, the program may detect that particular VxD 
    files from Microsoft are out of date.  Also, on some computers, 
    it is possible that the files may not be reported as out-of-date,
    but the adapter may not fully function after installation (for 
    example, the network side may function but the modem will not). 
    If the warning appears or such symptoms are encountered, it may 
    be necessary to obtain more recent versions of these files.  The 
    specific files are:

      CBSS.VXD
      PCI.VXD
      PCCARD.VXD

    These files may be obtained from Microsoft's Web site.

    In order to function with Windows 95 OSR2, CBMFFIX places a 
    "forced configuration" onto the slot the card is inserted into.  
    Once this forced configuration is applied, no other card can be 
    inserted into that slot. However, the CBEM adapter can still be 
    removed and reinserted (into the same slot only) while the laptop 
    is running.
    
    The forced configuration on the slot can be removed at a later 
    time by running CBMFFIX manually.  See the section below titled, 
    "Removing the Forced Configuration." 

    A log of the forced configuration data can be found in the 
    Windows\System directory in a file called CBMF.LOG.  This log also
    contains the VXD file versions currently installed in the system.

    Removing the Forced Configuration
    ---------------------------------
    The forced configuration on the slot can be removed by running 
    CBMFFIX manually.  It can be found in the Windows\System directory.
  
    When double-clicked, the CBMFFIX displays a dialog box describing 
    the forced configuration information.  Pressing on the "Remove 
    Forced Configuration" button will restore the slot to it's original  
    configuration.  Alternately, CBMFFIX can be accessed through the 
    Xircom Program group after the Utility installation has been run.
    
    Upgrading from Windows 95 OSR2 to Windows 98
    ---------------------------------------
    -If CBEM is installed under OSR2, and you are upgrading to Windows 
     98, the "forced configuration" must be removed.  See the above 
     section titled "Removing the Forced Configuration" for 
     instructions.

5)  NOTES ON CARD SERVICES
    ======================
     
    Windows NT 4.0 and Third Party Card Services
    --------------------------------------------
 
   -Softex PC Card Controller under Windows NT 4.0 is fully supported. 
    Xircom has developed CBENT.SYS and CBMODEMN.SYS to provide 
    additional hot swapping and PnP support under Softex Card and 
    Socket Services.  Please refer to your Quick Start Guide (QSG) 
    for installation instructions.  
    


6)  INSTALLING THE NDIS3 OR NDIS4 DRIVER IN WIN95 OSR2,98 AND NT 4.0
    ================================================================

    Be sure to use the appropriate install CDROM for your operating 
    system.  For Windows 95 OSR2, use the Windows 95 CD-ROM, and for 
    Windows 98 and Windows NT 4.0, use the Windows 98 and NT4 CD-ROM.
    Please refer to the QSG for instructions on installing NDIS3 or 
    NDIS4.
    
7)  CardBus Equipped Portable Computers
    ===================================

    The CBEM requires a portable computer with a CardBus PC Card 
    Slot.  Most laptops introduced after January 1997 incorporate
    CardBus PC Card slots.


8)  CREATING A DISK INSTALL
    ==============================
    -If you need a diskette version of the CBEM software for 
     installation on a system without a CD-ROM, the CD-ROM includes 
     two directories, DISK1 and DISK2 which contain files that can be 
     copied to diskettes.  This can be done manually or by running 
     MAKEDISK.BAT.  DISK1 includes necessary device drivers files.
     DISK2 includes the installation program for the Xircom
     Utilities. 
  
9) CUSTOMER SUPPORT
    =======================

    Please consult your laptop computer System Documentation for 
    additional Customer Support options, or visit the Xircom website
    at www.xircom.com

    Thank you for making Xircom a part of your network.

    Xircom acknowledges all tradenames and trademarks used in this 
    document as the property of their respective owners.

==============================end======================================




