OSWACOM - CHANGING COMMUNICATIONS SETTINGS FOR WIN-OS/2 SESSIONS
01/23/96

=======================================================================
        Changing Communications Settings for WIN-OS/2 Sessions
=======================================================================

Please Read Entire Document for Full Explanation of Procedures
--------------------------------------------------------------

DESCRIPTION

Communications speed is slow for Windows applications running in 
WIN-OS/2 sessions.

RESOLUTION

Each setting affects the communication speed for the applications 
differently, depending on if they are changed independently or changed 
in conjunction with others.

The IBM PC BBS has two drivers that were developed to increase speed: 
COM.SYS and VCOM.SYS. They are in the compressed file, SIO102.ZIP.

The drivers have different settings that are registered with WIN-OS/2 
settings. Also, there is a half-duplex setting called RTS that can 
improve speed significantly. You should use these at your own 
discretion.

1. Set EMS_MEMORY_LIMIT to ZERO, unless the application can use only
   EMS memory. EMS memory is slower than XMS memory. Use XMS or DPMI
   instead.

2. If you're not using HPFS, edit the CONFIG.SYS file and remark-out
   (REM) the statement:

   IFS=C:\OS2\HPFS.IFS /CACHE:64 /CRECL:4 /AUTOCHECK:F.

   Note: Do not delete this statement in case it's needed later.
         Use REM instead.

3. Set PRIORITY_DISK_IO to NO. This does not give foreground
   applications priority over background ones.

4. Edit the CONFIG.SYS file:

   a. Remove /UMB from DEVICE=C:\OS2\MDOS\VXMS.SYS /UMB. Windows might
      be using the UMB area. Deleting the use of the UMB area might
      resolve memory leakage and conflicts.

   b. Set DOS=LOW,NOUMB. This might prevent conflicts.

   c. Delete LW from DISKCACHE=1024,LW,AC:G. This is the lazy-write
      feature, and it is checked when exiting the OS/2 kernel.
      Eliminating lazy-write definitely increases communications
      performance.

   d. Set MAXWAIT to 1 for a fast CPU; leave it at 3 for a slow CPU.

5. Set the following WIN-OS/2 settings as shown:

     Change:                    To:
     -------                    ---
     IDLE_SECONDS               60 (maximum)
     IDLE_SENSITIVITY           100 (maximum)
     HW_TIMER                   ON
     HW_ROM_TO_RAM              ON
     COM_DIRECT_ACCESS          OFF
     COM_HOLD                   ON
     COM_RECEIVE_BUFFER_FLUSH   NONE
     COM_SELECT                 The port used

______________________________________________________________________
IBM disclaims all warranties, whether express or implied, including 
without limitation, warranties of fitness and merchantability with 
respect to the information in this document. By furnishing this 
document, IBM grants no licenses to any related patents or copyrights.  
Copyright (c) 1994, 1995 IBM Corporation. Any trademarks and product 
or brand names referenced in this document are the property of their 
respective owners. Consult your product manuals for complete trademark 
information.