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--------------------------------------------------------------------------
OS/2 2.x CONFIG.SYS FILE DESCRIPTION - Version 7 - October 17, 1993
Compiled By Rick Meigs, 7032 SW 26th Street, Portland, OR, 97219
--------------------------------------------------------------------------
Copyright (c) 1992-93 by Rick Meigs. If you find errors or have some help-
ful information, please do contact me at the address above. I also hang
around the FidoNet OS/2 conference, so you can drop me a note there also.
<<=ENCOURAGEMENT=>> This ASCII file may be freely distributed (AND YOU'RE
ENCOURAGED TO DO SO) on a not-for-profit basis, but the copyright notice
may not be removed nor may the file be modified.
VIEWING FILE: For best viewing, use the OS/2 System Editor with word wrap
OFF and full screen.
PRINTING FILE: Now in 80 column for easy printing.
CONTENTS:
1. Caution, warning and disclaimer.
2. Initial Comments.
3. CONFIG.SYS file description.
4. Obscure CONFIG.SYS settings.
5. Sample CONFIG.SYS files.
6. How to restore a damaged CONFIG.SYS file from a backup copy.
7. REXX Support from within the CONFIG.SYS file.
--------------------------------------------------------------------------
1. Cautions, warnings and disclaimers.
--------------------------------------------------------------------------
<<=CAUTION=>> Because of the way in which OS/2s Enhance PM Editor
(EPM.EXE) handles word wrapping, using it to edit your CONFIG.SYS file is
unwise. Best results are obtained using OS/2s System Editor (E.EXE).
<<=WARNING=>> IF YOU PLAN ON CHANGING ANY LINE IN YOUR CURRENT CONFIG.SYS
FILE, PLEASE BE SURE TO CREATE A BACKUP--BEFORE--YOU START EXPERIMENTING!
THIS HAS SAVED ME MORE THAN ONCE. MAKING A BACKUP COPY WILL DO YOU KNOW
GOOD IF YOU DON'T KNOW HOW TO RESTORE A DAMAGED CONFIG.SYS FILE WITH THE
BACKUP. I HAVE INCLUDED THE PROCEDURE AT THE END OF THIS FILE.
<<=REQUIRED READING=>> I CAN'T BE RESPONSIBLE FOR WHAT YOU DO WITH YOUR
SYSTEM OR YOUR CONFIG.SYS FILE BASED UPON WHAT YOU MAY LEARN FROM THE IN-
FORMATION PROVIDED IN THIS FILE. EVERY EFFORT HAS BEEN MADE TO MAKE THIS
FILE AS ACCURATE AS POSSIBLE, BUT NO WARRANTY OR FITNESS IS IMPLIED. THE
INFORMATION IS PROVIDED ON AN "AS IS" BASIS.
--------------------------------------------------------------------------
2. Initial Comments.
--------------------------------------------------------------------------
This project has become something more than I had anticipated when I first
released version one during the summer of 1992. Now in its sixth version
and I'm still finding out new things about OS/2s CONFIG.SYS file. Actual-
ly, this CONFIG.SYS FILE DESCRIPTION has become as much an optimization
"handbook" as it is a description. I assume that someday, all that can be
said about the CONFIG.SYS file will have been said. At that point I'll be
able to sit back and just let the last update circulate <g>.
Even with all the hours I've put into this CONFIG.SYS FILE DESCRIPTION, I
still find it often to be a mystery. At least one attempt to "demystify"
the file has been made by a major computer rag during 1992, but I found
myself more "mystified" than "demystified". Some of the information share
was just plain wrong. Still, mystery or not, to get the most out of OS/2
and your system, you MUST spend a little time editing your CONFIG.SYS file.
This whole process started in 1992 when I began researching what many of
the CONFIG.SYS file commands were for. This ever growing file is the re-
sult of that ongoing research. It briefly describes most of the common and
some of the more obscure commands. Naturally, not all possible commands
are listed (especially the many hardware device drivers), but there is a
lot here for you to work with. Version 6.x has been updated for OS/2 2.1.
Unlike the DOS CONFIG.SYS file which is read sequentially, OS/2 reads the
entire CONFIG.SYS file before it invokes the commands listed. Therefore,
except for a few exceptions which have been noted, it really doesn't matter
where a command is placed.
--------------------------------------------------------------------------
3. BEGINNING OF CONFIG.SYS FILE DESCRIPTION
--------------------------------------------------------------------------
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.BK1 C:\OS2\*.BK2
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.INI C:\OS2\*.BK1
Two files are essential to the operation of OS/2: OS2.INI and
OS2SYS.INI. If these files should get trashed, OS/2 isn't going to func-
tion. Backing them up is very important. In OS/2 version 2.0, once
booted, OS/2 will not let you access or copy these critical files. One
way to circumvent this is to create your backups BEFORE OS/2 is booted.
This CALL will do the trick. It creates first a backup of your backup
and then creates a backup of the original files. This gives you a two
generation backup. This process will add time to your system boot.
Generally OS/2 does not care where you place something in the CONFIG.SYS
file. This CALL is an exception in version 2.0. It must appear are the
first line as shown here because you need to complete this backup process
before OS2.INI AND OS2SYS.INI load.
<<=NOTE=>> In version 2.1, the INI files can be copied using the normal
OS/2 COPY command, but you may wish to consider adding this CALL to your
CONFIG.SYS file to automate the process.
<<=TIP=>> OS2.INI and OS2SYS.INI can also be reconstructed at boot by
holding down Alt-F1 during boot BEFORE the OS/2 logo appears. You may
need to hold the keys down for at least 20 seconds. During your initial
installation of OS/2, the installation process stored a copy of its
original INI files in the folder called INSTALL. When you press Alt-F1
at boot, OS/2 moves these "backup" files into the OS/2 folder to replace
the current versions.
<<=WARNING=>> Use the Alt-F1 key combination as a last resort because
you will lose all customization and changes you have made to the WpS.
<<=TIP=>> Add the following additional line, CALL=C:\OS2\XCOPY.EXE
C:\OS2\*.BK2 C:\OS2\INSTALL\*.INI, before the first CALL above. This
will replace the INI files in the INSTALL folder with a more recent ver-
sion. So when you have to use Alt-F1, you'll reboot without losing most
of your WpS customization.
IFS=C:\OS2\HPFS.IFS /CACHE:512 /CRECL:4 /AUTOCHECK:C
IFS stands for "Installable File System". This OS/2 command installs the
High Performance File System (HPFS), if you want to use it instead of
FAT. The syntax is IFS=DRIVE:PATH\FILENAME,SWITCHES. There are three
switches:
/CACHE:nnn sets up a disk cache and its size. The default on my 8MB sys-
tem (shown in the table below) is to low in my opinion. If you have 8MB
of RAM, set the cache to 512, but keep in mind that you don't want an
excessive cache because the memory used comes directly out of memory
available for programs, e.g. if you set a 2MB cache on a 6MB system, you
will notice a substantial negative performance hit. OS/2s Command Refer-
ence and other IBM sources indicate that the maximum cache size for HPFS
is currently 2MB, but IBM does not recommend using a cache larger than
1.5MB.
If this switch is omitted, the default will be 10% of the available RAM.
If you have formatted your system with only HPFS partitions, the cache
size in this statement, as set by OS/2 during installation, is that noted
under ONE FILE SYSTEM in the table below. If you have both FAT and HPFS
partitions, then OS/2 2.x set the cache sizes to those noted under TWO
FILE SYSTEM. The file system which uses the greatest amount of your disk
space gets the larger default value.
MEMORY SIZE IN MB TWO FILE SYSTEM ONE FILE SYSTEM
4 128/64 128
5 128/64 128
6 256/64 256
7 256/128 256
8 256/256 384
9 256/256 384
10 - 16 512/512 1024
17 - 32 1024/1024 2048
/CRECL sets the maximum record size for caching, from 2k to 64k in multi-
ples of 2k with a default of 4k; and,
/AUTOCHECK:nn tells the system to run CHKDSK and sets the drives to be
checked at startup.
<<=TIP=>> If you are using only FAT partitions, then you should REM this
statement and save yourself about 500k of RAM.
<<=TIP=>> If you have drive partitions larger than 80 or so megabytes,
then HPFS will give you better performance than FAT. On partitions of
less than 80MB, most authorities indicate that there is only a small per-
formance difference between HPFS and FAT.
<<=NOTE=>> Lazy write is on by default. If you want Lazy write off, see
the RUN=C:\OS2\CACHE.EXE command.
PAUSEONERROR=YES
This OS/2 only command tells OS/2 to stop for a moment if it cannot pro-
cess a line in the CONFIG.SYS file correctly. If you don't include this
statement in your CONFIG.SYS file, the default will be YES. It is gener-
ally the best choice since an error message will appear and scroll off
the screen so quickly with a NO setting that you may not notice it or be
able to read it.
PROTSHELL=C:\OS2\PMSHELL.EXE
This OS/2 command loads OS/2s user interface program (PMSHELL.EXE) which
allows you to make full-screen and window sessions work. The current
interface program is the Workplace Shell (WpS), but in theory you could
purchase or develop your own user interface and use it instead of the
WpS, much like Norton's Desktop is available for the Windows environment.
If you delete this line from your CONFIG.SYS file, OS/2 will load CMD.EXE
by default.
SET COMMAND: The SET command in the CONFIG.SYS file sets up environment
variables for the entire system. These environmental variables are stored
by OS/2 in memory and are shared by any applications which calls on them.
There are a number of these "environment variables" covered below.
<<=NOTE=>> These variables can also generally be changed at an OS/2 com-
mand prompt.
<<=TIP=>> If you want to see what variables are set in your system, at
an OS/2 command prompt type the word SET and press return. You'll get a
list like the following:
WP_OBJHANDLE=87103
USER_INI=C:\OS2\OS2.INI
SYSTEM_INI=C:\OS2\OS2SYS.INI
OS2_SHELL=C:\OS2\CMD.EXE
AUTOSTART=PROGRAMS,TASKLIST,FOLDERS
RUNWORKPLACE=C:\OS2\PMSHELL.EXE
COMSPEC=C:\OS2\CMD.EXE
PATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;C:\OS2\INSTALL;
C:\;C:\OS2\MDOS;
DPATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;C:\OS2\INSTALL;
C:\;C:\OS2\BITMAP;
PROMPT=$E[1;33m[$P]$G
HELP=C:\OS2\HELP;C:\OS2\HELP\TUTORIAL;
GLOSSARY=C:\OS2\HELP\GLOSS;
DIRCMD=/ON /P
IPF_KEYS=SBCS
KEYS=OFF
BOOKSHELF=C:\OS2\BOOK
EPMPATH=C:\OS2\APPS;
VIDEO_DEVICES=VIO_SVGA
VIO_SVGA=DEVICE(BVHVGA,BVHSVGA)
WORKPLACE__PROCESS=NO
SET USER_INI=C:\OS2\OS2.INI
Tells OS/2 the name and locations of the file that contains your desktop
setup information and the options saved from various OS/2 applications.
OS2.INI is the default file name.
This file remains open the entire time OS/2 is booted and operating. It
only closes upon Shutdown. If it should become "trashed", MAKEINI.EXE,
which ships with OS/2 and is in the OS2 directory, can be used to build a
new set of INI files. You will have to boot from an OS/2 floppy to do
so.
<<=NOTE=>> OS2.INI is a critical file for the proper operation of OS/2
and should not be deleted or modified. It is not an ASCII file and, if
it should become damaged, cannot be modified with an ASCII editor. You
should consider backing up this file by using the CALL lines shown above
or with a program such as WPSBKUP. It is one of several shareware pro-
grams design for this purpose. Check your favorite OS/2 BBS.
SET SYSTEM_INI=C:\OS2\OS2SYS.INI
Tells OS/2 the name and location of its INI file (OS2SYS.INI).
OS2SYS.INI tells OS/2 what kind of equipment your system uses. NOTE:
OS2SYS.INI is a critical files and should not be deleted or modified. It
is not an ASCII file and can't be edited. You should consider backing up
this file by using the CALL line shown as the first line above or with a
program such as WPSBKUP, a shareware program you can obtain on many OS/2
BBSs.
This file remains open the entire time OS/2 is booted and operating. It
only closes upon Shutdown. If it should become "trashed", MAKEINI.EXE,
which ships with OS/2 and is in the OS2 directory, can be used to build a
new set of INI files. You will have to boot from an OS/2 floppy to do
so.
SET OS2_SHELL=C:\OS2\CMD.EXE
OS2_SHELL directs OS/2 to load the command-line shell (CMD.EXE) when you
ask for an OS/2 command line from the WpS.
<<=WARNING=>> Be careful with this line, OS/2 will not start without it.
<<=TIP=>> If you wish to run some other command-line shell, such as
4OS2, change this line and the SET COMSPEC=C:\OS2\CMD.EXE line, substi-
tuting the appropriate EXE file for CMD.EXE.
SET AUTOSTART=PROGRAMS,TASKLIST,FOLDERS
This command is used to start parts of the OS/2 WpS. There is one other
parameter: CONNECTIONS. This starts any network connection in use when
the system was last shutdown.
<<=WARNING=>> If you remove any of these statements, then you may not
get OS/2 to respond or you will be restricted from accessing portions of
the shell. For example, if you leave out FOLDERS, Folders, including the
Desktop which is also a folder, can not be opened. If you delete TASKL-
IST, then you will not obtain the OS/2 TASKLIST when you press Ctrl-Esc
and if PROGRAMS is in included, only programs in your startup folder will
be available.
SET RUNWORKPLACE=C:\OS2\PMSHELL.EXE
This line tells the system what interface program is to be used. In this
case it is the Workplace Shell.
<<=TIP=>> If you want to run OS/2 with only a command line interface,
you can do so by changing this line to read SET RUNWORKPLACE=
C:\OS2\CMD.EXE. This brings OS/2 up without the WpS and gives you one
screen session. Without the WpS, you lose much of OS/2s functionality,
but you can start other sessions using the START or DETACH command.
Otherwise, operated just like you were in DOS. If you have started more
than one session, switch between them using Alt+Esc. For those who want
the power of OS/2 and like to work only from a command line, give this a
try. I'm running in this mode right now just as a test and it appears to
work fine.
This is also a way to improve performance on 4MB RAM systems, since the
WpS take up LOTS of ram.
<<=WARNING=>> If you run without the WpS as noted in the <<=TIP=>>
above, you can not perform a "shut down" from a command line. To do a
shut down, at a command line, type PMSHELL and press enter. This starts
the WpS. Once the WpS is open, you should be able to perform a standard
shut down.
SET RESTARTOBJECTS=YES
This command tells OS/2 what applications to start after you suspend op-
erations with or without doing a Shutdown (as in doing a Ctrl-Alt-Del
because some faulty program has locked up your system). If this state-
ment is not in your CONFIG.SYS, then the default is YES, i.e., start all
objects that were running at the time of Shutdown or reboot. Other op-
tions are:
NO = do not start any applications that were running at time of shut-
down or reboot.
STARTUPFOLDERSONLY = start objects only in the Startup folder. This
parameter is also handy for another purpose. If you have one or
more programs in the Startup folder and do a shutdown without clos-
ing the programs (i.e. left the programs open at shutdown), then
reboot, OS/2 will restart the programs left open AND the Startup
folder will start another copy. Thus you will have two copies run-
ning. Setting this parameter eliminates this.
REBOOTONLY = Start objects only if the OS/2 WpS is starting from a
reboot (Ctrl-Alt-Del) or at power on. Objects will not restart if
the WpS is restarted as a result of its own error correction recy-
cling.
<<=TIP=>> You can also circumvent the auto-starting of programs by hold-
ing down Ctrl-Shift-F1 all at the same time during boot. It must be done
AFTER your mouse pointer is seem (but not to soon after it appears), but
before any icons appear.
SET COMSPEC=C:\OS2\CMD.EXE
This line identifies what OS/2 command-line shell is to be used and where
its at. In DOS, COMMAND.COM is equivalent to CMD.EXE.
<<=TIP=>> If you wish to run some other command-line shell, such as
4OS2, change this and the SET OS2_SHELL=C:\OS2\CMD.EXE line, substituting
the appropriate EXE file for CMD.EXE.
LIBPATH=.;C:\OS2\DLL;C:\OS2\MDOS;C:\;C:\OS2\APPS\DLL;
This is an OS/2 command. It tells OS/2 where to locate Dynamic Link Li-
braries (DLLs). LIBPATH is similar to DPATH and PATH, but the statement
can only be used in the CONFIG.SYS file and OS/2 does not search the cur-
rent directory for DLLs unless you include it in the LIBPATH statement.
You don't need to use the SET command with LIBPATH, it is not an environ-
ment variable.
<<=TIP=>>To reduce the search time for OS/2 to locate the file(s), be
sure that the various PATH statements contain the correct path to your
program and other files. You can also have OS/2 search the current di-
rectory by including a period "." right after the equal "=" symbol.
This causes OS/2 to look in the current logged directory first.
One final item that will reduce search time: Be certain that the PATH,
LIBPATH and DPATH statements in the CONFIG.SYS are arranged with the most
frequently accessed subdirectories listed first.
SET PATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;
C:\OS2\INSTALL;C:\;C:\OS2\MDOS;C:\OS2\APPS;
Just like in DOS, it tells both DOS and OS/2 where to find programs.
SET DPATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;
C:\OS2\INSTALL;C:\;C:\OS2\MDOS;C:\OS2\APPS;
This is an OS/2 command. It tells OS/2 programs where to look for data
files. It is similar to the DOS APPEND command, but unlike APPEND, DPATH
only works with programs designed to use it.
SET PROMPT=[$P]$G
Like the same DOS command, this line sets how your OS/2 command prompt
will appear. (This is for OS/2 only. Set the DOS PROMPT default in your
AUTOEXEC.BAT file.) In the setting shown here, the command prompt will
appear showing the current directory of the default drive enclosed in []
followed by the greater than symbol, i.e. [C:\]>. Having brackets []
around the drive and directory information lets you quickly know when you
are at an OS/2 command line verse a DOS command line.
If you type PROMPT without a parameter, OS/2 will return its default
prompt [$p].
Options include:
$B = The | character
$C = The open parenthesis (
$D = Current date
$E = ASCII code 27 (escape) so you can work with ANSI. See <<=TIP=>>
below.
$F = The close parenthesis )
$G = The "greater than" > symbol
$H = BACKSPACE over the previous character
$I = Turns help line on
$L = The "less than" < character
$N = Default drive
$P = Current directory of default drive
$Q = The equal = character
$S = The space character
$T = Current time
$V = OS/2 version number
$_ = Carriage return or line feed
<<=TIP=>> You can also add ANSI control sequences to your prompt. For
example, to help me know visually whether I'm working with an OS/2 com-
mand line, I've add $E[1;33m to my prompt line, i.e. SET
PROMPT=$E[1;33m[$P]$G. This sets text to display in bold yellow charac-
ters. Bold yellow characters means OS/2 command line. White characters
means DOS command line.
SET HELP=C:\OS2\HELP;C:\OS2\HELP\TUTORIAL;
Tells OS/2 where the help files are located. OS/2 will only look for a
program's help files in the path shown.
SET GLOSSARY=C:\OS2\HELP\GLOSS;
Tells OS/2 where the Glossary file and Master Help file is located.
SET DIRCMD=/ON /P
This undocumented command is the OS/2 equivalent of the DIR command in
DOS. Since DOS 5, you can tell DIR how to present file information. To
do this in OS/2, use the DIRCMD command. For example: SET DIRCMD=/ON /P
tells OS/2 to display the DIR information in alpha order and place a
pause at the end of each page.
This is for OS/2 only. Set the DOS default in your AUTOEXEC.BAT file.
Options include:
/A list files with specific attributes. E.g. /AH list only hidden
files. Other options are S A & R. If you place a negative (-)
sign in front of your specified attribute, all files will list ex-
cept those with the attribute specified. E.g. /A-H-S will display
all files except hidden and system files.
/B list directories and files without heading and summary information.
/F list files with the full drive and path information. Date, time
and size are omitted.
/L displays information in lowercase.
/N lists files on a FAT drive in the same format used for a HPFS
drive, i.e. date, time, size, name.
/O list files according to sort option specified. Sort options are:
G = Display directories first.
N = alphabetize by file name
-N = reverse-alphabetizes by name
E = alphabetize by extension
-E = reverse-alphabetizes by extension
D = by date, oldest first
-D = by date, newest first
S = by file size, smallest first
-S = by file size, largest first
/P pauses after a full screen of files is listed.
/R displays long file names if applicable.
/S searches and displays all directories.
/W displays file names across the screen. Date, time and size are
omitted.
SET IPF_KEYS=SBCS
The character set for most languages can be represented as data using an
8-bit byte since their characters sets are each less than 256 characters.
These are Single Byte Character Sets (SBCS). Languages such as Japanese,
Korean and Chinese can only be represented as data using two 8-bit bytes
or 16-bits. These are Double Byte Character Sets (DBCS).
This command tells the Information Presentation Facility (INF and help
files) which type of character set is being used, i.e., Single or Double
Byte Character Set. This is an Environment variable. Removing it from
my system did not seem to have any impact.
PRIORITY_DISK_IO=YES
This command determines whether programs running in the foreground have
priority access to disks. The default is YES. If you want a program,
like a BBS, running in the background to have equal access to your disks,
then change this statement to NO.
PRIORITY=DYNAMIC
OS/2 automatically assigns processing priorities to each thread of a pro-
gram as it begins processing. A thread running in the foreground will
generally have priority over a thread running in background. Thread pri-
orities are adjusted, generally based upon how active they are, by OS/2
on an ongoing basis to make sure each thread has adequate processing
time. On the rare occasion that you need to run a program which must
never change in priority, you should set PRIORITY=ABSOLUTE, otherwise,
don't mess with it.
This is another OS/2 only command and does not have to be in your
CONFIG.SYS. If it is not, then OS/2 defaults to PRIORITY=DYNAMIC.
FILES=20
This is a standard DOS command which sets the maximum number of files
that DOS can access at the same time. OS/2 sets the default at 20, but
some DOS programs may require that you increase this number. The maximum
parameter is 255. FILES is for DOS only and has no effect on OS/2 ses-
sions which can have up to 64,000 files open at the same time.
DEVICE=C:\OS2\TESTCFG.SYS
TESTCFG.SYS is used during the install process to test your systems con-
figuration. It is also used by the Selective Install process and during
device driver installations.
<<=NOTE=>> Because this driver is also used by the Selective Install
process, you should not be deleted.
DEVICE=C:\OS2\PMDD.SYS
OS/2 loads and uses this driver to provide pointer draw support along
with POINTDD.SYS.
<<=WARNING=>> OS/2 will not start without this line in your CONFIG.SYS
file.
BUFFERS=30
Tells OS/2 how many disk buffers to set aside. Range is from 3 to 100.
Each buffer takes up to 512 bytes of RAM. 30 is the default and usually
works well. If you are using HPFS only, see tip below.
Disk buffers are blocks of memory set aside by OS/2 for use in reading
and writing blocks of data. For example, if a program wants to change 80
bytes of a file, it needs to read the 512 byte sector that contains the
original data, change the information and then write the corrected 512
byte sector back out. A "buffer" is the 512 byte temporary staging area
for this partial sector operation. According to source at IBM, "OS/2 al-
lows multiple simultaneous I/O operations to be queued up for both dis-
kette and hard disk. Each 'concurrent' operation may need a buffer. If
there are not enough buffers, overlap can be inhibited. Because OS/2 has
more 'simultaneous' queued I/O than DOS, it needs more buffers."
<<=TIP=>> Generally, you can speed up your system by increasing the
number of BUFFERS. But, keep in mind that as you increase the number,
you reduce available memory. 30 is the default, but you may wish to ex-
periment with a higher number, like 50 or 60. Be careful about using a
lower number unless you only have 4MB of RAM. With 4MB of RAM you may
wish to set BUFFERS to 20. This gives you some more valuable memory.
<<=TIP=>> If you are using only HPFS (i.e., no FAT partitions), set
BUFFERS to 3. With HPFS you don't need BUFFERS. Remember that 3 is the
minimum parameter. If you set BUFFERS to 1 or 2, OS/2 will default to 30
since 1 and 2 are out of range.
IOPL=YES
An OS/2 command that, when set to YES, lets programs that need to bypass
OS/2, and its device drivers, and work directly with hardware devices, do
so. One example is Lotus 123/G. YES means that all programs can access
the hardware directly. NO means that no program can access the hardware
directly. YES is the default and is generally best, since its hard for
most of us to know when a program is written is such a way as to need
direct access to hardware.
IOPL stands for Input/Output Privilege Level.
<<=TIP=>> You can also specify a list of programs that are allowed to
work directly with the hardware. For example, IOPL=WS.EXE,123.EXE would
allow only these two programs to access hardware directly.
RUN=C:\OS2\CACHE.EXE /MAXAGE:2500
This line runs CACHE.EXE which allows you to modify the parameters for
the HPFS cache. CACHE.EXE is only used for HPFS partitions. (The DIS-
KCACHE command sets up a cache for FAT.) There are four switches for
CACHE.EXE:
/LAZY: Determines if lazy writes is ON or OFF, that is, whether the
contents of the cache will be written to your hard disk immediately
(/LAZY:OFF) or when your hard disk is idle (/LAZY:ON). The default
is ON. I like lazy writes ON because it improves performance, but
keep in mind that since the system delays writing data to your hard
disk, you can lose data if your system should crash. In the CON-
FIG.SYS file line above no switch is specified therefore the de-
fault remains in effect, which is ON.
<<=TIP=>> Lazy writes can also be turned ON or OFF at an OS/2 com-
mand prompt.
<<=WARNING=>> If you include the /LAZY switch, then the CACHE
statement will IGNORE ALL OTHER SWITCHES in the line. Therefore,
if you want to turn lazy writes off (or on) and also change some
other parameter, you will need two RUN statements.
<<=WARNING=>> There is a bug in OS/2 version 2.1. I verified it
on my system. You can not turn lazy writes off from the CONFIG.SYS
file. The WpS always turns lazy writes ON when it loads regardless
of what your CACHE.EXE command sets. So, if you want lazy writes
off, you will need to run the CACHE command AFTER the WpS starts.
Create a CMD file to turn it off and place it in your startup fold-
er. The WpS has already done it's thing when the objects in the
startup folder are opened. You can also turn it off from a command
prompt. (Thanks to Denis Tonn for this critical information).
/MAXAGE: Sets how long data waits in the cache before it is moved to
another area of the cache where less used information is stored, or
how long data waits in the cache before it is written to the hard
disk. It is expressed in milliseconds. The default is 5,000 or
about 5 seconds. In the CONFIG.SYS file line above, the wait is
set at 2,500 milliseconds or about two 1 seconds. I've done this
to reduce the chance of data loss.
/DISKIDLE: Sets how long your hard disk must be idle before it will
accept data from the cache. Express in milliseconds and the de-
fault is 1,000 or about one second. In the CONFIG.SYS file line
above no switch is specified therefore it defaults remains in ef-
fect.
/BUFFERIDLE: Sets how long the cache buffer must be idle before its
contents MUST be written to your hard disk. Express in millisec-
onds and the default is 500 or about 1 second. In the CONFIG.SYS
file line above no switch is specified therefore it defaults re-
mains in effect.
According to one source at IBM, there are two other undocumented parame-
ters. I have not pursued their verification, so I can't tell you much.
/DIRTYMAX: The threshold number of dirty buffers before immediately
flushing of least recently used (LRU) data blocks is needed.
/WRITECACHE: The threshold number of bytes that HPFS will cache for a
lazy write.
<<=NOTE=>> The HPFS IFS CONFIG.SYS file line sets up the cache and uses
the system defaults. This CONFIG.SYS file line is only used to modify
the cache parameters.
<<=TIP=>> You can check to see what parameters the HPFS cache is cur-
rently set at by going to an OS/2 command prompt and keying in the word
CACHE and pressing the enter key.
DISKCACHE=256,LW,32,AC:C
If you are using FAT file system, this command sets up a RAM disk cache.
CACHE: The DISKCACHE line noted here sets up a 256k cache. The de-
fault cache size is based upon your RAM. See the table below. If you
have the RAM, increase the size to improve system performance, but don't
get carried away by using to much of your RAM. This will hurt perfor-
mance by causing to much memory swapping to disk. Maximum FAT cache size
is 14MB.
If you have formatted your system with only FAT partitions, the default
cache size in this statement will be that noted under ONE FILE SYSTEM in
the table below. If you have both FAT and HPFS partitions, then OS/2 2.x
defaults to the cache size noted under TWO FILE SYSTEM. The file system
which uses the greatest amount of your disk space gets the larger default
value.
MEMORY SIZE IN MB TWO FILE SYSTEM ONE FILE SYSTEM
4 128/64 128
5 128/64 128
6 256/64 256
7 256/128 256
8 256/256 384
9 256/256 384
10 - 16 512/512 1024
17 - 32 1024/1024 2048
LW: Enables lazy writes. If you don't want lazy write enabled, then
remove ",LW".
32: The third number set the threshold size. It is express in number of
sectors which are 512 bytes each. Data requests from your disk that are
larger than this number will not be cached. The default is 4. Thirty
two (32) is said to be an optimum number. One hundred twenty eight (128)
is the maximum allowable. This setting has no impact on RAM.
AC:C: If you want CHKDSK to automatically check your startup partition
(usually C), then add this switch to end of the DISKCACHE command: AC:n
where n is your startup partition, e.g. AC:C.
<<=TIP=>> If you are only using HPFS, then you should REM this statement
(don't delete, you may need or want it later) and save some RAM.
MAXWAIT=3
This OS/2 command sets the longest period a program will have to wait to
execute before OS/2 ups its priority. This makes sure that no program is
put on hold forever while some other program hogs the system. You can
set MAXWAIT from 1 to 255 seconds. The default is 3 seconds.
<<=TIP=>> When running heavy background programs, such as a BBS, change
the setting to 1, i.e. MAXWAIT=1. This will keep the BBS software or
other background programs running at top speed. For general use, it ap-
pears that setting MAXWAIT=2 makes the system a little livelier.
MEMMAN=SWAP,PROTECT
OS/2 can run more programs and use more data than can actually be stored
in memory at any given time. This is done by swapping large amounts of
memory to your hard disk and then reading the data back into memory when
needed. This is called virtual memory. For example, if you only have
4MB of memory (Get MORE memory fast! You need 8MB minimum with OS/2
2.x.) you will see lots of disk activity while you are working with your
system. A lot of this is OS/2 swapping memory to your hard disk. Lots
of memory swapping will slow down your system and cause your hard disk to
fragment quicker than normal.
The MEMMAN command controls the swap process. The syntax is
MEMMAN=s,m,PROTECT,COMMIT where s=SWAP or NOSWAP; m=MOVE or NOMOVE. The
default is to have virtual memory on. To turn off virtual memory, which
is NOT recommended, the CONFIG.SYS file line should read: MEMMAN=NOSWAP.
PROTECT allows the allocation and use of protected memory. Unless you
are a programmer who needs this set to NOPROTECT, leave the default.
<<=NEW 2.1 PARAMETER=>> A new parameter with version 2.1 is COMMIT.
With this parameter included, OS/2 will allocate space in the swap file
whenever a program commits memory. Increase your SWAPPER.DAT file (in
the SWAPPATH line below) by the amount of memory you are likely to use
when using the COMMIT parameter.
<<=TIP=>> You can also use the COMMIT parameter another way. Without
COMMIT set, the minimum free noted in you SWAPPATH specified the point at
which OS/2 gives you a message warning that your disk space is running
low. When you set COMMIT, the minimum free value noted in your SWAPPATH
statement becomes the amount of hard disk space that will always remain
free on the swap file partition. Thus, with COMMIT set, you can never
run out of disk space on your swap file partition.
<<=CAUTION=>> When messing with the MEMMAN line (I mean experimenting) I
changed it to MEMMAN=NOSWAP. As a result, I had to boot from my OS/2
Installation disk and recover my backup CONFIG.SYS file to get the system
to boot. I don't know why, but use caution.
<<=NOTE=>> The MOVE/NOMOVE parameter has no effect under OS/2 2.x and is
only provided for OS/2 version 1.x compatibility.
<<=NOTE=>> NOPACK PARAMETER. When OS/2 initially loads a 16-bit OS/2
application, it packs the segments into pages and copies them to the swap
file for faster recovery when needed. This can be disabled by using the
NOPACK option on the MEMMAN= line. However, the performance decrease and
larger working set will rarely offset the potential of a reduced swap
file size.
SWAPPATH=C:\OS2\SYSTEM 512 4096
OS/2 can allocate more memory than it actually has available. It does
this by swapping memory to a hard disk file called SWAPPER.DAT.
The syntax is SWAPPATH=DRIVE,PATH,mmm,nnn where DRIVE AND PATH is the
location where you want the SWAPPER.DAT file to be placed; mmm is a
number from 512 to 32767 and specifies how large the SWAPPER.DAT file can
grow before it stops consuming hard disk space. The size is stated in
the negative. In other words, if you have the mmm set to 512, then the
SWAPPER.DAT file can grow until there is only 512k left on your hard
disk. The variable nnn is the starting size of the SWAPPER.DAT file. In
the CONFIG.SYS file line above, the starting size is 4096 or 4MB.
The default SWAPPER.DAT size is set based upon the amount of RAM your
system has available as shown in the table below.
MEMORY IN MB MINFREE (KB) INITIAL SIZE (KB)
4 4096 6144
5 4096 5120
6 4096 5120
7 2048 4096
8 2048 4096
9 2048 3072
10 2048 3072
11 - 32 2048 2048
<<=TIP=>> When your swap file grows beyond the initial size you have
specified, OS/2 starts to manage the swap file. This will negatively
impact your systems performance because of the additional system over-
head. Therefore, if your swap file always exceeds its initial size, con-
sider increasing the swap files initial size.
<<=TIP=>> Normal operation of OS/2 2.x involves considerable disk activ-
ity as operating system functions are loaded and pages are moved in and
out of the swap file. Here are a couple of tips to improve performance.
(1) Consider dedicating a separate partition for the swap file. This
helps avoid fragmentation of the swap file, because other files will not
be added or deleted from the dedicated partition. (2) If you have both
FAT and HPFS partitions, put the swap file on the HPFS partition to take
advantage of the better performance of HPFS. (3) If you have a system
with two hard disk controllers, put the swap file on a disk managed by
the least used controller.
<<=WARNING=>> Never put your swap file on a networked drive.
<<=NOTE=>> Your swap file will grow (in 1MB increments), but it also
shrinks when two conditions are met. When the amount of free space in
the swap file is greater than 1.5MB, the swap file will be compressed
during system idle time. During the compression, free space is moved to
the end of the swap file. When this free space at the end of the swap
file exceeds 1MB, the swap file will be shrunk.
<<=NOTE=>> See the discussion of the new COMMIT parameter for the MEMMAN
CONFIG.SYS line including the <<=TIP=>>.
BREAK=OFF
For DOS programs only. Many DOS programs can be stopped by holding down
the Ctrl key and then pressing the Break key. BREAK controls how quickly
DOS programs stop when you interrupt them with the Ctrl-Break sequence.
If BREAK=OFF, DOS will stop the program only when the programs next reads
a character from the keyboard or writes to the screen or printer. With
BREAK=ON, DOS will check for the Ctrl-Break on a more frequent basis.
Remember that this extra checking can make your DOS programs run slower.
THREADS=256
OS/2 programs can have several different processes running at the same
time. These are called threads. This OS/2 command sets the maximum
number of threads, from 32 to 4095, that OS/2 can run at the same time.
<<=TIP=>> On systems with only 4MB of RAM, set THREADS to 128 to free up
memory. If you only have 4MB of RAM, get more fast. You'll be amazed at
the difference another 4 or 8MB of RAM will make!
<<=TIP=>> If you have more than 8MB of RAM and run mostly OS/2 specific
programs, you should be able to improve system responsiveness by increas-
ing the number of threads. Why? Because well written OS/2 programs will
use threads to improve program performance. Therefore, the more OS/2
programs in use, the more threads that could be needed.
PRINTMONBUFSIZE=134,134,134
This OS/2 command sets the size of the print buffers for your parallel
ports. The syntax is PRINTMONBUFSIZE=LPT1,LPT2,LPT3 where LPT1 is the
buffer size for the parallel port LPT1, LPT2 is the buffer size for LPT2
and LPT3 is the buffer size for LPT3. The default and minimum is 134
bytes and the maximum is 2048 bytes.
<<=Note=>> You must define a buffer for LPT2 and LPT3 even if you don't
use these ports. You will get an error message at startup if you don't.
<<=TIP=>> You may be able to improve printer throughput by increasing
buffer size.
<<=TIP=>> On systems with less than 6MB of RAM, don't increase the size
of these buffers.
COUNTRY=001,C:\OS2\SYSTEM\COUNTRY.SYS
Customizes your system for the country you wish to use. It establishes
which defaults to use when it comes to decimal separators, date and time
formats, currency symbols, etc. The syntax is COUNTRY=xxx,PATH,FILE
NAME. xxx is a three-digit code number that tells what country to use.
The number is usually (but not always) the same as the international tel-
ephone dialing prefix for the country desired. The table below contains
various country codes.
COUNTRY COUNTRY CODE
Arabic-speaking 785
Asia (English) 099
Australia (English) 061
Belgium 032
Canada (French) 002
China 088
Czechoslovakia 042
Denmark 045
Finland 358
France 033
Germany 049
Hebrew-speaking 972
Hungary 036
Iceland 354
Italy 039
Japan 081
Korea 082
Latin America 003
Netherlands 031
Norway 047
Poland 048
Portugal 351
Spain 034
Sweden 046
Switzerland 041
Taiwan 088
Turkey 090
United Kingdom 044
United States 001
Yugoslavia 038
SET KEYS=OFF
When using the Command-line, KEYS tells CMD.EXE whether to remember prev-
ious keystrokes so they can be recalled with the up arrow key. OS/2
maintains a 64k buffer for storing keystroke history. KEYS can be ON or
OFF.
<<=TIP=>> On systems with only 4MB of RAM, SET KEYS to OFF, you need the
memory more than this feature. Even with 8MB of RAM, since I don't use
the feature I have turned it off to get a small memory boost.
REM SET DELDIR=C:\DELETE,512;
To use OS/2s UNDELETE command, you must first establish a directory in
which to store the deleted files. To do this, create a directory called
DELETE in your root and then remove the "REM" from this CONFIG.SYS file
line.
This command points OS/2 to the directory you created to place deleted
files in. It also indicates the maximum number of files that will be
stored in the DELETE directory. If the number of deleted files exceeds
the maximum number that you specified, then files are automatically re-
moved from the directory on a first-in-first-out basis.
BASEDEV=PRINT01.SYS
BASEDEV=IBM1FLPY.ADD
BASEDEV=IBM1S506.ADD
BASEDEV=OS2DASD.DMD
BASEDEV installs a base device driver used by OS/2 when it is first
started. The statement cannot contain either a drive or path because
OS/2 cannot process such information at the stage at which these state-
ments are process. Other base device drivers include:
PRINT01.SYS supports attached printers on non-Micro Channel PC's.
PRINT02.SYS supports attached printers on Micro Channel PC's.
IBM1FLPY.ADD supports diskette drives on non-Micro Channel PC's.
IBM2FLPY.ADD supports diskette drives on Micro Channel PC's.
IBM2SCSI.ADD supports SCSI disk drives on Micro Channel PC's.
OS2SCSI.DMD supports non-disk SCSI devices.
IBM1S506.ADD supports non-SCSI disk drives on non-Micro Channel PC's.
OS2DASD.DMD is a general purpose driver for disk drives.
IBM2ADSK.ADD supports non-SCSI disk drives on Micro Channel PC's.
IBMINT13.I13 supports non-Micro Channel SCSI adapters.
SET BOOKSHELF=C:\GAMMA32;C:\OS2\BOOK
This command points to the on-line documentation (INF files) provided
with OS/2 and to any on-line documentation provided by other OS/2 pro-
grams. I have the GAMMATECH utilities installed on my system which con-
tains on-line documentation.
<<=TIP=>> If you an HPFS partition, copy all of your on-line documenta-
tion (INF files) to this partition. Then change this parameter to re-
flect the new path. You will notice a substantial improvement in search
speed since HPFS is much faster than FAT.
SET EPMPATH=C:\OS2\APPS
Replaced SET EPATH=C:\OS2\APPS; in version 2.0. According to one source
in IBM, EPMPATH is used by the Enhanced Editor (EPM.EXE).
REM DEVICE=C:\OS2\APPS\SASYNCDB.SYS
This device driver loads asynchronous communications support for the PM
Terminal applet.
<<=TIP=>> If you don't use PM Terminal, REM this line to save a little
memory. In fact, if you are not using PM Terminal you may wish to con-
sider deleting the files to save some disk space also.
PROTECTONLY=NO
An OS/2 command. Allows you to choose between a shared DOS and OS/2 op-
erating environment or just an OS/2 environment. If you plan to run only
OS/2 programs, then set PROTECTONLY=YES. If you plan to run DOS programs
(this includes Windows programs also), then set PROTECTONLY=NO.
SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P
This line identifies and loads the DOS command processor COMMAND.COM
which you must have to make DOS sessions work. The /p switch keeps the
command processor in memory until shutdown.
This is the line where you can also specify the size of the DOS environ-
ment variable. The range is 160 through 32768. For example, to set a
1024 byte environment you would add the following to the end of the SHELL
command line: /E:1024
<<=TIP=>> You can also load and run other command processor's such as
4DOS. To do so, just put 4DOS in your MDOS directory and change the
SHELL line to read 4DOS.COM instead of COMMAND.COM.
FCBS=16,8
A file control block (FCBS) is an outmoded record that gives information
about a file to DOS. This CONFIG.SYS file line tells DOS how many FCBS
can be open at once, or, when DOS needs to open more FCBS than are avail-
able, how many currently open but not active FCBS may be closed to make
room for new ones.
The syntax is FCBS=a,b where a=the number of FCBS that DOS can have open
at one time and b=the number of FCBS DOS cannot close to make room for
new FCBS. "a" can be as high as 255. "b" can have a value of 0 to 254,
but must be less than "a". Unless you get some kind of error message
when running a DOS program that tells you the program doesn't have enough
FCBS, leave the default as set.
<<=TIP=>> You may wish to experiment with a smaller number. If you can
get by with a smaller number, you will get back a little memory in each
of your DOS sessions.
RMSIZE=640
This is a DOS command and sets the amount of memory available for use by
each DOS session. The maximum is 640k. Since some DOS programs require
640k, its best to have RMSIZE set to 640.
<<=TIP=>> If you only have 4MB of RAM or don't have any DOS programs
that need a full 640k, you should consider reducing this parameter to
512. Many DOS applications will run in a 512k DOS partition. Doing this
will free up some additional RAM which will help performance.
<<=TIP=>> If you need maximum memory (more than 640k), see tip under
DOS=LOW,NOUMB.
DEVICE=C:\OS2\MDOS\VEMM.SYS
VEMM.SYS lets DOS programs use expanded memory unless you override it by
changing a DOS programs SETTINGS.
Three of its switches are:
/S=n Sets the limit of EMS memory in blocks of 1024k. Default is 2.
/L=n Size of conventional memory that can be remapped. Default is
none.
/F=nnnn Memory frame address to be used to map EMS. Default is AUTO.
Settings you specify in a DOS session will override these switches.
<<=NOTE=>> The VEMM.SYS device must be listed in your CONFIG.SYS file
before the VXMS.SYS device.
DEVICE=C:\OS2\MDOS\VMOUSE.SYS
Identifies and loads the mouse driver to let you use a mouse with DOS.
Mouse support for OS/2 is loaded below.
<<=NOTE=>> If you don't have this line (or you REM'd it), you will not
have mouse support in your DOS sessions.
DOS=LOW,NOUMB
This is a standard DOS command that lets you control how DOS uses memory.
The OS/2 default is DOS=LOW,NOUMB and is considered by many to be the
best setting for it conserves memory for OS/2. DOS=HIGH (including ,UMB)
reduces available memory for OS/2, but increases the available memory in
EVERY DOS session. Few DOS sessions need maximum memory. Also remember
that you can move DOS HIGH for a specific program by changing that pro-
grams DOS. This is done in the programs Settings Notebook and is likely
the better way to go. Finally, keep in mind that in OS/2 many device
drivers are not taking up room in your 640k DOS area. So you generally
have more memory in the typical OS/2 DOS session than in a standard DOS
session.
The following is the amount of memory my system reports in each DOS ses-
sion with DOS=LOW,NOUMB. The vast majority of all DOS programs will run
just fine with this amount of memory.
655360 bytes total memory
655360 bytes available for DOS
618208 largest executable program size <---- This equals about 604k.
With DOS=HIGH, the amount of memory reported is:
655360 bytes total memory
655360 bytes available for DOS
643632 largest executable program size <---- About 629k.
<<=TIP=>> If you have need for maximum available RAM in a DOS session
and can get by on CGA or MONO, change RMSIZE=639 (See description of this
parameter three command lines above) in your CONFIG.SYS file (has to be
639k due to a bug in OS/2). Then in DOS Settings of your applications
Settings Notebook, change VIDEO_MODE_RESTRICTION to CGA or MONO. The
amount of memory reported after doing this on my machine is:
752640 bytes total memory
752640 bytes available for DOS
740656 largest executable program size
REM DEVICE=C:\OS2\APM.SYS
Device driver for ADVANCED POWER MANAGEMENT system used with laptop sys-
tems. If you have this line in your CONFIG.SYS file and you are NOT us-
ing a laptop, REM or delete the statement. If you are using a laptop,
see the OS/2 README file for more details on its operation.
DEVICE=C:\OS2\MDOS\VXMS.SYS /UMB
VXMS.SYS is a device driver that provides Extended Memory management to
DOS sessions. XMS allows DOS programs to access more than one MB of mem-
ory. You need the /UMB switch at the end if you want upper memory block
support in DOS sessions.
<<=NOTE=>> The VXMS.SYS device must be listed in your CONFIG.SYS file
after the VEMM.SYS device.
DEVICE=C:\OS2\MDOS\VDPX.SYS
Driver required when using VDPMI in the CONFIG.SYS file line below. One
authority said that this driver "provides V86 to Protected Mode transla-
tion for DPMI memory". Well that's enough to lose me.
DEVICE=C:\OS2\MDOS\VDPMI.SYS
Provides "virtual" DPMI (DOS Protect Mode Interface) memory for DOS and
Window sessions. I don't know much about this, but I've been told not to
remove it.
DEVICE=C:\OS2\MDOS\VWIN.SYS
Assists in the process of providing seamless Windows support.
DEVICE=C:\OS2\EXTDSKDD.SYS
EXTDSKDD.SYS supports external disk drives.
REM DEVICE=C:\OS2\PCMCIA.SYS
REM DEVICE=C:\OS2\MDOS\VPCMCIA.SYS
These two drivers are new to version 2.1. They provide support for com-
puters that have PC Memory Card International Association (PCMCIA) adapt-
ers.
<<=TIP=>> If you don't have any PCMCIA devices, then you should REM
these drivers to save a little RAM.
REM DEVICE=C:\OS2\MDOS\VCDROM.SYS
This is a CD-ROM device driver.
<<=TIP=>> If you don't have a CD-ROM installed, then you should REM this
line to save a little RAM. Remember, the more RAM OS/2 has--up to
16MB--the better it runs. After 16MB it doesn't seem to improve much,
overall.
REM IFS=C:\OS2\CDFS.IFS
This OS/2 command is needed if you have a CD-ROM. It installs CDFS.INF
which is the "Installable File System" for CD-ROMs. Your CD-ROM is not
going to run without it.
DEVINFO=SCR,VGA,C:\OS2\VIOTBL.DCP
This command prepares your monitor to display information based upon the
CODEPAGE specification. VIOTBL.DCP is the file that contains the video
fonts for displaying characters for each of the CODEPAGES supported by
OS/2. See the CODEPAGE command line below.
DEVICE=C:\OS2\MDOS\VVGA.SYS
Your CONFIG.SYS file will contain various device drivers for various de-
vices based upon your systems hardware configuration. This device driver
happens to be for the VGA video card.
DEVICE=C:\OS2\POINTDD.SYS
POINTDD.SYS is the file that contains information on what the mouse
pointer looks like and draws it on you screen.
<<=WARNING=>> In order for MOUSE.SYS to work effectively, this driver
must be loaded by OS/2. Do not remove it from your CONFIG.SYS file.
DEVICE=C:\OS2\MOUSE.SYS SERIAL=COM1 QSIZE=10
Lets you use a mouse or track ball with OS/2. This line also identifies
the type of mouse you have and which COM port it is on. QSIZE is a
number from 1 to 100 which indicates how many mouse actions are to be
saved when you execute mouse actions faster than your system can handle
them.
<<=NOTE=>> The MOUSE.SYS statement must come before the COM.SYS because
COM.SYS will take over any unused COM port. If COM.SYS takes over the
COM ports before MOUSE.SYS is loaded, MOUSE.SYS will not have any COM
ports available, thus no mouse support.
DEVICE=C:\OS2\COM.SYS
Lets you use the communications ports one and two (COM1 and COM2). (If
you want to use COM3 or COM4 or change the IRQ of a COM point, see
<<=TIP=>> below.) This line MUST appear after any driver that uses the
communications ports. Use COM02.SYS for IBM PS/2 model 90 and 95.
<<=TIP=>> There is a very good replacement driver for COM.SYS\VCOM.SYS
called SIO.SYS\VSIO.SYS. It can be obtained on most OS/2 BBSs. If you
utilize a communications packet on a regular basis at high speeds (e.g.
14,400), I recommend you consider SIO.SYS. Replace VCOM.SYS (below) with
VSIO.SYS which comes with SIO.SYS. SIO.SYS and VSIO.SYS are Shareware,
not Freeware. Register them is you use them!!!
<<=TIP=>> To add support for COM3 and COM4 at location 3E8 with IRQ 4
and 2E8 with IRQ 3 respectively, add (3,3E8,4) (4,2E8,3) to the DEVICE
line, e.g. DEVICE=C:\OS2\COM.SYS (3,3E8,4) (4,2E8,3). You can also use
this method to change a COM ports assigned IRQ.
DEVICE=C:\OS2\MDOS\VCOM.SYS
Lets you use the communications ports for DOS and Windows sessions. Must
appear after the COM.SYS driver.
<<=NOTE=>> If you are using COM3 and/or COM4, add the appropriate param-
eters to the COM.SYS line above only. It is not necessary to add any
parameters to this line. VCOM.SYS inherits its parameters from the
COM.SYS line.
<<=TIP=>> See TIP under DEVICE=C:\OS2\COM.SYS regarding SIO.SYS.
DEVICE=C:\OS2\MDOS\ANSI.SYS
This is the traditional DOS command most are familiar with. It only af-
fects DOS sessions. This line is not added to your CONFIG.SYS file by
default. If you want it, you need to add it.
OS/2 sessions have ANSI support by default. If you are unsure if ANSI is
on or off in an OS/2 session, go to an OS/2 command prompt and type ANSI.
You will get a message like: ANSI extended screen and keyboard control
is on. For an OS/2 session, turn ANSI off or on by typing ANSI OFF or
ANSI ON at an OS/2 command prompt.
DEVICE=C:\OS2\LOG.SYS
This optional device driver installs OS/2s error-log file. If you want a
log of errors that occur on your system, then add this and the next line
to your CONFIG.SYS file. If you are interested in such things, you may
wish to play with it, but be forewarned, the error log information is
cryptic. For example, only error codes are reported. To learn what
these codes mean, you need to have IBMs Systems Network Architecture For-
mats (GA27-3136-12) or, for a reasonable overview, get OS/2 2.1 Un-
leashed, 1993, SAMS Publishing.
The switch /E:<kb> sets the size of the error-log buffer. The range is
from 4kb to 64kb with 8kb as the default. I've not used this switch in
the CONFIG.SYS file line above, therefore the default will be used.
You will get a short and quick message during boot up indicating that
Logging has been installed and what the buffer size is.
<<=NOTE=>> LOG.SYS has its limitations. It will not log an application
error unless the application has be written to make use of LOG.SYS. Some
routine system errors will not log either because OS/2 opens an error
message box on screen to report these.
RUN=C:\OS2\SYSTEM\LOGDAEM.EXE /E:C:\OS2\LOGFILE.DAT /W:16
This RUN command states the logging process and must appear AFTER you
have installed the LOG.SYS driver noted in the CONFIG.SYS file line
above. The two switches are:
/E:<path><filename> This is the path and file name of the test file
where the errors will be logged. You can place it anywhere you
want and call it anything you wish. NOTE: Like the OS/2 INI
files, this file is "locked" and you will not be able to access it
with your standard text editor or the OS/2 System Editor. You will
get a "violation error". The Enhanced Editor will open the file.
/W:<kb> This is the size of the file named with the /E switch. The
default size is 64k, but with this switch you can set the value
from 4k to 64k. I've set the file size at 16k in the example line
above.
<<=NOTE=>> Use SYSLOG.EXE from an OS/2 command line prompt to view your
log file.
CODEPAGE=437,850
Lets you use the alphabet of various countries and languages. The syntax
is CODEPAGE=ppp,sss, where ppp is the number of the primary national al-
phabet to be used and sss is a secondary alphabet number. 437=US English
alphabet and 850=multinational alphabet. The multinational alphabet con-
tains most of the accented letters used in various European languages.
Several other alphabets that can be supported by your version of OS/2.
See table below.
<<=WARNING=>> Japan, Korean and Chinese require a special version of
OS/2 and special hardware.
<<=NOTE=>> If there is not a CODEPAGE statement in your CONFIG.SYS file,
your keyboard will use an alphabet based on the COUNTRY statement found
earlier in your CONFIG.SYS file, but your screen and printer will use
their built-in defaults.
COUNTRY PRIMARY SECONDARY
CODE PAGE CODE PAGE
Arabic-speaking 864 850
Asia (English) 437 850
Australia (English) 437 850
Belgium 850 437
Canada (French) 863 850
Czechoslovakia 852 850
Denmark 850 n/a
Finland 850 437
France 437 850
Germany 850 437
Hebrew-speaking 862 850
Hungary 852 850
Iceland 850 861
Italy 437 850
Japan 932 437, 850
Korea 934 437, 850
Latin America 437 850
Netherlands 850 437
Norway 850 n/a
Peoples Republic of 938 437, 850
China
Poland 852 850
Portugal 850 860
Spain 850 437
Sweden 850 437
Switzerland (French) 850 437
Switzerland (German) 850 437
Taiwan 437 850
Turkey 857 850
United Kingdom 437 850
United States 437 850
Yugoslavia 852 850
DEVINFO=KBD,US,C:\OS2\KEYBOARD.DCP
Tells the keyboard which international character set to use and where to
find the file KEYBOARD.DCP which translates keystrokes. The syntax is
DEVINFO=KBD,cc,DRIVE,PATH,FILENAME. The parameter cc equals the charac-
ter set to be used, e.g. US = United States. See table below for charac-
ter set codes.
LANGUAGE COUNTRY CODE
Arabic AR
Belgian BE
Canadian French CF
Czech/Czech CS243
Czech/Slovak CS245
Danish DK
Dutch NL
Finnish SU
French FR
German GR
Hebrew HE
Hungarian HU
Icelandic IS
Italian IT
Latin American LA
Norwegian NO
Polish PL
Portuguese PO
Spanish SP
Swedish SV
Swiss (French) SF
Swiss (German) SG
Turkish TR
United Kingdom UK
United States US
Yugoslavian YU
DEVICE=C:\OS2\VDISK.SYS 512
As in DOS, this driver installs a RAM disk. In this example, the RAM
disk is 512k with the sectors and directories parameters set at the de-
fault level (64-byte sectors and 64 directory entries). With DOS, a RAM
disk could significantly improve system performance, but because OS/2
handles your memory far more efficiently than DOS and has its own sophis-
ticated caching routines, using a RAM disk is not recommended.
<<=CAUTION=>> Because a RAM disk takes available memory away from OS/2,
you may negatively impact system performance on systems with less than
12MB of RAM. Unless you have lots of RAM or have a very specific need,
don't install a RAM disk.
<<=NOTE=>> If you do install VDISK.SYS and you also have EXTDSKDD.SYS
installed, VDISK.SYS much be placed after EXTDSKDD.SYS in your CONFIG.SYS
file. Check your online Command Reference for information on
EXTDSKDD.SYS.
--------------------------------------------------------------------------
END OF CONFIG.SYS FILE DESCRIPTION
--------------------------------------------------------------------------
4. Obscure CONFIG.SYS settings.
--------------------------------------------------------------------------
What follows are some very obscure CONFIG.SYS file settings. They are here
only for informational purposes. Unless you have a very specific need and
know what you're doing, please don't experiment with these.
SET SHELLEXCEPTIONHANDLER=OFF
The WpS has its own exception handling routines which allows it to recov-
er from most errors. You can turn this "exception handling" with this
command. Could be useful when debugging an object.
SET OBJECTSNOOZETIME=45
Useful when programming certain types of object DDLs.
TIMESLICE=128,256
This command allows you to manually control the minimum and maximum
amount of processor time any thread can receive at once. The syntax is
TIMESLICE=x,y where x is the minimum time slice (in millisecond and must
be at least 32) and where y is the maximum length (must be less than
65536).
<<=TIP=>> OS/2 handles time slicing dynamically. This means that the
system is adjusting the time slice values based on the actual processes
active on the system as the workload changes. Therefore, it is best not
to attempt to manually set TIMESLICE. OS/2 can handle this process far
better than most of us can.
TRACE=ON
Helpful for System Administrators and programmers. Assists in the track-
ing of system problems by turning TRACE on (or off) and establishing a
buffer (4k is default. You can increase this using the command TRACEBUF)
to store tracing data. You can also start TRACE from an OS/2 command
prompt.
--------------------------------------------------------------------------
5. Sample CONFIG.SYS files.
--------------------------------------------------------------------------
FILE FOR CLONE WITH 8MB OF RAM AND VGA RUNNING ONLY HPFS
--------------------------------------------------------
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.BK1 C:\OS2\*.BK2
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.INI C:\OS2\*.BK1
IFS=C:\OS2\HPFS.IFS /CACHE:512 /CRECL:4 /AUTOCHECK:C
PROTSHELL=C:\OS2\PMSHELL.EXE
SET USER_INI=C:\OS2\OS2.INI
SET SYSTEM_INI=C:\OS2\OS2SYS.INI
SET OS2_SHELL=C:\OS2\CMD.EXE
SET AUTOSTART=PROGRAMS,TASKLIST,FOLDERS
SET RUNWORKPLACE=C:\OS2\PMSHELL.EXE
SET RESTARTOBJECTS=YES
SET COMSPEC=C:\OS2\CMD.EXE
LIBPATH=.;C:\OS2\DLL;C:\OS2\MDOS;C:\;C:\OS2\APPS\DLL;
SET PATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;
C:\OS2\INSTALL;C:\;C:\OS2\MDOS;C:\OS2\APPS;
SET DPATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;
C:\OS2\INSTALL;C:\;C:\OS2\BITMAP;C:\OS2\MDOS;C:\OS2\APPS;
SET PROMPT=$E[1;33m[$p]$g
SET HELP=C:\OS2\HELP;C:\OS2\HELP\TUTORIAL;
SET GLOSSARY=C:\OS2\HELP\GLOSS;
SET DIRCMD=/O /P
SET IPF_KEYS=SBCS (New with version 2.1)
PRIORITY_DISK_IO=YES
FILES=20
DEVICE=C:\OS2\TESTCFG.SYS
DEVICE=C:\OS2\DOS.SYS
DEVICE=C:\OS2\PMDD.SYS
BUFFERS=50
IOPL=YES
REM * DISKCACHE=256,LW,32,AC:C
MAXWAIT=2
MEMMAN=SWAP,PROTECT
SWAPPATH=C:\OS2\SYSTEM 512 4096
BREAK=OFF
THREADS=256
PRINTMONBUFSIZE=402,134,134
COUNTRY=001,C:\OS2\SYSTEM\COUNTRY.SYS
SET KEYS=OFF
REM * SET DELDIR=C:\DELETE,512;
BASEDEV=PRINT01.SYS
BASEDEV=IBM1FLPY.ADD
BASEDEV=IBM1S506.ADD
BASEDEV=OS2DASD.DMD
SET BOOKSHELF=C:\OS2\BOOK
SET EPMPATH=C:\OS2\APPS
REM * DEVICE=C:\OS2\APPS\SASYNCDA.SYS
PROTECTONLY=NO
SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P
FCBS=16,8
RMSIZE=640
DEVICE=C:\OS2\MDOS\VEMM.SYS
DEVICE=C:\OS2\MDOS\VMOUSE.SYS
DOS=LOW,NOUMB
DEVICE=C:\OS2\MDOS\VDPX.SYS
DEVICE=C:\OS2\MDOS\VXMS.SYS /UMB
DEVICE=C:\OS2\MDOS\VDPMI.SYS
DEVICE=C:\OS2\MDOS\VWIN.SYS
REM * DEVICE=C:\OS2\PCMCIA.SYS (New with version 2.1)
REM * DEVICE=C:\OS2\MDOS\VPCMCIA.SYS (New with version 2.1)
REM * DEVICE=C:\OS2\MDOS\VCDROM.SYS
DEVINFO=SCR,VGA,C:\OS2\VIOTBL.DCP
SET VIDEO_DEVICES=VIO_VGA
SET VIO_VGA=DEVICE(BVHVGA)
DEVICE=C:\OS2\MDOS\VVGA.SYS
DEVICE=C:\OS2\POINTDD.SYS
DEVICE=C:\OS2\MOUSE.SYS SERIAL=COM1
DEVICE=C:\OS2\COM.SYS
DEVICE=C:\OS2\MDOS\VCOM.SYS
CODEPAGE=437,850
DEVINFO=KBD,US,C:\OS2\KEYBOARD.DCP
FOR CLONE WITH 8MB RAM AND VGA RUNNING ONLY FAT
-----------------------------------------------
Make the following two changes in the CONFIG.SYS listing above.
o REM this line: IFS=C:\OS2\HPFS.IFS /CACHE:512 /CRECL:4 /AU-
TOCHECK:C
o Remove the REM from this line: REM DISKCACHE=256,LW
FOR CLONE WITH 8MB RAM AND VGA RUNNING BOTH FAT AND HPFS
--------------------------------------------------------
Make the following change in the CONFIG.SYS listing above.
o Remove the REM from this line: REM DISKCACHE=256,LW
FOR CLONE WITH 4 OR 6MB OF RAM AND VGA RUNNING FAT
--------------------------------------------------
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.BK1 C:\OS2\*.BK2
CALL=C:\OS2\XCOPY.EXE C:\OS2\*.INI C:\OS2\*.BK1
REM * IFS=C:\OS2\HPFS.IFS /CACHE:512 /CRECL:4 /AUTOCHECK:C
PROTSHELL=C:\OS2\PMSHELL.EXE
SET USER_INI=C:\OS2\OS2.INI
SET SYSTEM_INI=C:\OS2\OS2SYS.INI
SET OS2_SHELL=C:\OS2\CMD.EXE
SET AUTOSTART=PROGRAMS,TASKLIST,FOLDERS
SET RUNWORKPLACE=C:\OS2\PMSHELL.EXE
SET RESTARTOBJECTS=YES
SET COMSPEC=C:\OS2\CMD.EXE
LIBPATH=.;C:\OS2\DLL;C:\OS2\MDOS;C:\;C:\OS2\APPS\DLL;
SET PATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;
C:\OS2\INSTALL;C:\;C:\OS2\MDOS;C:\OS2\APPS;
SET DPATH=C:\OS2;C:\OS2\SYSTEM;C:\OS2\MDOS\WINOS2;C:\OS2\INSTALL;
C:\;C:\OS2\BITMAP;C:\OS2\MDOS;C:\OS2\APPS;
SET PROMPT=$E[1;33m[$p]$g
SET HELP=C:\OS2\HELP;C:\OS2\HELP\TUTORIAL;
SET GLOSSARY=C:\OS2\HELP\GLOSS;
SET DIRCMD=/O /P
SET IPF_KEYS=SBCS (New with version 2.1)
PRIORITY_DISK_IO=YES
FILES=20
DEVICE=C:\OS2\TESTCFG.SYS
DEVICE=C:\OS2\DOS.SYS
DEVICE=C:\OS2\PMDD.SYS
BUFFERS=20
IOPL=YES
DISKCACHE=64,LW,12,AC:C
MAXWAIT=2
MEMMAN=SWAP,PROTECT
SWAPPATH=C:\OS2\SYSTEM 512 6144
BREAK=OFF
THREADS=128
PRINTMONBUFSIZE=134,134,134
COUNTRY=001,C:\OS2\SYSTEM\COUNTRY.SYS
SET KEYS=OFF
REM * SET DELDIR=C:\DELETE,512;
BASEDEV=PRINT01.SYS
BASEDEV=IBM1FLPY.ADD
BASEDEV=IBM1S506.ADD
BASEDEV=OS2DASD.DMD
SET BOOKSHELF=C:\OS2\BOOK
SET EPMPATH=C:\OS2\APPS
REM * DEVICE=C:\OS2\APPS\SASYNCDA.SYS
PROTECTONLY=NO
SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P
FCBS=16,8
RMSIZE=512
DEVICE=C:\OS2\MDOS\VEMM.SYS
DEVICE=C:\OS2\MDOS\VMOUSE.SYS
DOS=LOW,NOUMB
DEVICE=C:\OS2\MDOS\VDPX.SYS
DEVICE=C:\OS2\MDOS\VXMS.SYS /UMB
DEVICE=C:\OS2\MDOS\VDPMI.SYS
DEVICE=C:\OS2\MDOS\VWIN.SYS
REM * DEVICE=C:\OS2\PCMCIA.SYS (New with version 2.1)
REM * DEVICE=C:\OS2\MDOS\VPCMCIA.SYS (New with version 2.1)
REM * DEVICE=C:\OS2\MDOS\VCDROM.SYS
DEVINFO=SCR,VGA,C:\OS2\VIOTBL.DCP
SET VIDEO_DEVICES=VIO_VGA
SET VIO_VGA=DEVICE(BVHVGA)
DEVICE=C:\OS2\MDOS\VVGA.SYS
DEVICE=C:\OS2\POINTDD.SYS
DEVICE=C:\OS2\MOUSE.SYS SERIAL=COM1
DEVICE=C:\OS2\COM.SYS
DEVICE=C:\OS2\MDOS\VCOM.SYS
CODEPAGE=437,850
DEVINFO=KBD,US,C:\OS2\KEYBOARD.DCP
--------------------------------------------------------------------------
6. HOW TO RESTORE A DAMAGED CONFIG.SYS FILE FROM A BACKUP COPY
--------------------------------------------------------------------------
1. Boot OS/2 from the OS/2 Installation Disk.
2. Insert OS/2 Disk #1 when asked.
3. Press the ESC key when you get the first text screen. By
doing this you will be put into OS/2s command-line mode.
4. Assuming that your backup copy of CONFIG.SYS is named
CONFIG.SAV, enter the following command:
COPY C:\CONFIG.SAV C:\CONFIG.SYS
Press the ENTER key.
5. Remove OS/2 Disk #1 and reboot system.
What if you didn't make a backup copy? IBM thought about you. When OS/2
was first installed on your system, the installation program made a backup
copy of your original CONFIG.SYS file. It stored this file in C:\OS2\IN-
STALL. To restore from this file follow the same steps above, EXCEPT, in
step #4 enter the following command instead of the one shown:
COPY C:\OS2\INSTALL\CONFIG.SYS C:\CONFIG.SYS
<<=TIP=>> Replace the CONFIG.SYS file saved by the OS/2 installation
program in the INSTALL directory with your most current version, thus
allowing you to restore from it.
--------------------------------------------------------------------------
7. REXX SUPPORT FROM WITHIN THE CONFIG.SYS FILE.
--------------------------------------------------------------------------
The question of whether REXX programs can be called from within the
CONFIG.SYS file has been asked by a number of people. Keith Medcalf's re-
sponse to the question is one of the best I've seen. Thanks Keith!
------------------------------------------------------------------------
Date: 07-30-93, 08:06 Number: 483
From: Keith Medcalf Refer: 477
To: Russ Williams Recvd: No
Subj: REXX from CONFIG.SYS Conf: Ibm.Os2se
------------------------------------------------------------------------
Wednesday July 28 1993 16:34, Russ Williams wrote to All:
RW> Can anyone tell me what restrictions there are on running REXX
RW> programs from CONFIG.SYS (via "CALL=")? It doesn't work for me, and
RW> the online help is no help.
You cannot. The DLLs required to support Rexx are not loaded until Pre-
sentation Manager is loaded. If you require Rexx support earlier, look
for a program call SRVREXX at a fine BBS near you.
Adding the line RUN=SRVREXX.EXE to the config.sys will immediately ini-
tialize Rexx. You will then be able to access Rexx with or without PM
being loaded.
--------------------------------------------------------------------------
END OF FILE