Release Notes  PN 93000160

                      Digi RealPort Service
                          Version 1.0.7

                         Windows NTŪ 4.0

                   Software Package PN 40001738
                   Software Manual  PN 92000290

                            05/04/2000

CONTENTS
Section  Description
1        Introduction
2        Supported Products
3        Bug Fixes
4        Known Limitations
5        Installing Modem 4em or 8em Modules
6        Printers
7        History

1. INTRODUCTION

   The RealPort service provides Windows NT seamless access to serial ports 
   on Digi PortServer or PortServer II products.

   The Digi PortServer Product family allows Windows NT users to attach 
   serial devices (modems, terminals, and printers) to the Ethernet based 
   terminal server.  Users can use Windows NT RAS, Citrix, dial-out modem 
   pooling applications and terminal server applications such as Point-of-Sale
   (POS) with the flexibility of terminal server connected devices.

   The RealPort Service requires the TCP/IP driver to be installed and 
   properly configured.

2. SUPPORTED PRODUCTS

   PortServer
   PortServer II

3. BUG FIXES

   A close/open race condition has been resolved.  The symptoms of this error 
   were exhibited by invalid data returned when using the DOS command 
   MODE, or a printer problem after a system reboot.

   A transmit latency condition has been resolved.  The symptom of this error 
   involves single character data incurring latencies of 120ms.  This symptom 
   was only encountered when an application buffer character input, but only 
   issue a single character to the driver.  The driver was designed with the 
   assumption that the application would send a buffer of data when available
   and not parcel the data a character at a time.

   A fix for serial printers has been added.

4. KNOWN LIMITATIONS

   PortServer generates receive data errors when running 16 ports full duplex 
   at 57600 BAUD.  Changing the baudrate of a serial printer requires deleting
   the printer device and then re-adding the device with a different baudrate.
   This is a print manager limitation in Windows NT 4.0.

   Software flow control characters when set to the null (0x00) character for 
   the Xon and Xoff character will be ignored by the driver.

   The IOCTL_SERIAL_XOFF_COUNTER is not supported.

5. INSTALLING MODEM 4EM or 8EM MODULES

   Windows NT 4.0.  Copy mdmdigi.inf from the RealPort installation disk into 
   the %SystemRoot%\inf directory.  Then add the modems from modem control 
   panel.

6.  PRINTERS

   Printers using the RealPort driver should be manually started, or the 
   RealPort driver must be started before the printer services.

7.  UNINSTALL

   Windows NT 4.0
      1. Run Control Panel | Network 
      2. Select Services
      3. Select the Digi RealPort Service from the Network Services list
      4. Choose Remove

7. HISTORY

   Version 1.0.3
   August 25, 1998 - Bug fixes.

   Version 1.0.2
   November 7, 1997 - Bug fixes.

   Version 1.0.1
   July 21, 1997 - Initial product release.