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1996-07-16
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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.