Knowledge Base
Title: Using IBM DLC with Windows for Workgroups
Document Number: Q93236           Publ Date: 18-AUG-1993
Product Name: Windows For Workgroups
Product Version:  3.10
Operating System: WINDOWS

If the steps or procedures described in this article do not function properly, contact the manufacturer of the third-party product for more information or use a supported configuration.

SUMMARY Windows for Workgroups was not designed to support the use of IBM LAN Support drivers. These drivers provide a data link control interface and perform many of the same functions as Windows for Workgroups real-mode components.

MORE INFORMATION IBM LAN Support drivers DXMAxMOD.SYS and DXMCxMOD.SYS form a monolithic stack and perform a similar function to the Windows for Workgroups real-mode protocol manager and NDIS driver. Since these drivers do provide NetBIOS services, the Windows for Workgroups network, including peer-to-peer functionality, can be made to work with them.

The drivers cannot be used with Windows for Workgroups unless the protocol manager (PROTMAN.DOS) and Network Driver Interface Specification (NDIS) driver (for example, IBMTOK.DOS) have been removed from the CONFIG.SYS file. By making the modifications below, you can configure your Windows for Workgroups network to run with the IBM LAN Support drivers.

WARNING: Once these changes have been made, you will undo them if you make any changes through Control Panel, Networks, Adapters. This writes the removed files back into the CONFIG.SYS and AUTOEXEC.BAT files.

Installing IBM LAN Support Drivers (Data Link Control) 1. Edit the CONFIG.SYS file and remove the following lines:

       Device=c:\windows\protman.dos /i:c:\windows  <-- the protocol
                                                         manager

       Device=c:\windows\IBMTOK.DOS                 <-- the NDIS
                                                        driver

       Device=c:\lansup\DXMA0MOD.SYS
       Device=c:\lansup\DXMC0MOD.SYS
       Device=c:\windows\workgrp.sys /n
       Device=c:\lansup\DXMT0MOD.sys O=N ST=10 S=25 C=22 ES=2 EST=2

3. Edit the AUTOEXEC.BAT file and remove the following line:

       Net Start

The data link control IBM LAN Support drivers are most commonly used by 3270 terminal emulators to communicate with IBM mainframes and by 5250 terminal emulators to communicate with IBM AS/400s, using Advanced Program-to-Program Communications (APPC).

For help with data link control IBM LAN support drivers, call IBM product support services at (800) 772-2227.

For additional information on integrating Microsoft data link control with Windows for Workgroups, consult the Windows for Workgroups Resource Kit, Appendix E.

Support provided by Microsoft Product Support Services for LAN Manager is available on a fee-basis. For additional information about Microsoft support options, call Microsoft Inside Sales at (800) 227-4679, Monday through Friday, 6:30 A.M. to 5:30 P.M., Pacific time, excluding holidays.

Additional reference words: 3.10 DXMA0MOD.SYS DXMC0MOD.SYS DXMT0MOD.SYS datalink SDLC DLC WFWG reboot boot real mode

COPYRIGHT Microsoft Corporation, 1993.