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1995-02-23
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OSWACOM - COMMUNICATIONS SETTINGS FOR WIN-OS/2 SESSIONS
11/29/94
================================================================
COMMUNICATIONS (COM) SETTINGS FOR WIN-OS/2 SESSIONS
================================================================
Please Read Entire Document for Full Explanation of Procedures
----------------------------------------------------------------
SYMPTOMS:
Communications speed is slow for Windows applications running in
WIN-OS/2 sessions.
RESOLUTION:
Each setting affects COM speed for the applications differently
depending on if they are changed independently or changed in
conjunction with others.
PROCEDURE:
There are new COM.SYS and VCOM.SYS on BBS called SIO102.ZIP.
These drivers are written in assembly and are developed to
increase speed. They have different settings that are registered
with WIN-OS/2 settings. Also, there is a half-duplex setting
call RTS that can give significant speed improvements. You
should to use these at your own discretion.
1. Set EMS_MEMORY_LIMIT to ZERO unless the application can
only use EMS memory. EMS memory is slower than XMS memory.
Use XMS or DPMI instead.
2. If not using HPFS, remark (REM) out HEIFS=C:\OS2\HPFS.IFS
/CACHE:64 /CRECL:4 /AUTOCHECK:F.
Note: REM this out, do not delete, in case the line is
needed later.
3. Set PRIORITY_DISK_IO=NO. This does not give foreground
application's priority boost over the background ones.
4. Remove the /UMB from the DEVICE=C:\OS2\MDOS\VXMS.SYS /UMB
in the OS/2 CONFIG.SYS. Windows may be using the UMB area.
Deleting the use of the UMB area may resolve memory leakage
and conflicts.
5. Set DOS=LOW,NOUMB in the CONFIG.SYS. This may prevent
conflict.
6. For the DISKCACHE=1024,LW,AC:G in the OS/2 CONFIG.SYS,
delete the LW parameter. This is the lazy write feature and
it is checked exiting the OS/2 kernel. Not having lazy write
definitely increases COM performance.
7. Set MAXWAIT to 1 for a fast CPU. Leave this to 3 for a slow
CPU.
8. The following WIN-OS/2 settings can be changed:
a. IDLE_SECONDS 60 (maximum)
b. IDLE_SENSITIVITY 100 (maximum)
c. HW_TIMER ON
d. HW_ROM_TO_RAM ON
e. COM_DIRECT_ACCESS OFF
f. COM_HOLD ON
g. COM_RECEIVE_BUFFER_FLUSH NONE
h. 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.