Title: Config.sys Options Configuring your DOS system for use: ------------------------------------ When booting DOS, you will find it only supports a subset of the devices available on many computers. To support additional devices and advanced features, device specific driver and memory resident software most be loaded. This allows the kernel to be easily extended to support hardware not presently available and take better advantage of installed hardware without wasting resources on computers lacking it. This software is generally loaded during the kernel initialization phase, with details describing what to load expressed in the file CONFIG.SYS. The FreeDOS kernel will first look for a file named FDCONFIG.SYS, should it exist, it will will be used instead of CONFIG.SYS; this allows the FreeDOS kernel to coexist and be configured differently than another DOS kernel. There are additional options available to adjust other aspects of the kernel's behaviour. Note: some options listed below are FreeDOS specific and will not work when using other/older DOS kernels. Below is list of all documented FreeDOS config.sys supported options; additional undocumented options may exist but are not meant for normal usage. BREAK Usage: break=on|off Set extended Control-C/Control-Break checking to on [default] or off. When set to on, the kernel will perform the check (and invoke current handler if pressed) prior to most int 21h calls. When set to off, the kernel only performs the check on I/O calls using standard streams. e.g. break=off BUFFERS BUFFERSHIGH Usage: buffers=nn[,n] where nn is in range 1-99 & n is in range 1-8 Memory buffers used by the kernel; primary[,secondary] The secondary buffer option is available for compatibility with other DOS kernels, but is ignored by the FreeDOS kernel. e.g. buffers=20 COUNTRY Usage: country=nnn[,[mmm][,[d:][path]file]] Only limited country=nnn support is presently available. Enables/sets international features of DOS nnn is country code (001==US) mmm is code page (437 is default, 850 is updated form, 1252 for Windows) [drive][path]file specifies file with country specific data e.g. country=001,850,C:\FDOS\BIN\COUNTRY.SYS DEVICE Usage: device=[d:][path]file [options] Load the device driver specified by d:path\file (into conventional [low 640KB] memory). The options are for the driver itself; refer to documentation that came with your particular device for supported options and their usage. e.g. device=himem.sys DEVICEHIGH Usage: devicehigh=[d:][path]file [options] This is just like device= statement, except it attempts to load the device driver into high memory first (failing that it should load it in conventional memory). Note: The order you load devices may have a large impact on amount of free memory available. In general try to load large (in memory usage) programs into high memory first. Important: You should have a high memory manager such as FDXMS or Himem installed (prior device=FDXMS.SYS or device=HIMEM.SYS) before using this option. e.g. devicehigh=atapicdd.sys /D:FDCD0001 DOS Usage: dos=high|low,umb|noumb Indicates whether the kernel should try to load itself into high memory or only conventional (low), and whether to link upper memory blocks in with normal memory or not. Note: only one set need be given, ie dos=high and dos=noumb are ok. Important: if you specify dos=high[,umb|noumb] then you must also load a high memory manager (first), ie FDXMS or HIMEM e.g. dos=high,umb or dos=low,noumb DOSDATA Usage: dosdata=umb Try to load kernel data into Upper Memory Blocks; effectively same as using the HIGH variant of kernel parameters, such as fileshigh, lastdrivehigh, and stackshigh (does not effect drivers loaded using device= or install=). e.g. dosdata=umb ECHO Usage: ECHO Message to be displayed to user. ECHO displays (echos) its arguments to the console during config.sys processing when device drivers are loaded (when DEVICE= lines are executed). e.g. ECHO loading driver 1 device=Driver1.sys ECHO driver1 successfully loaded EECHO Usage: EECHO Message with ANSI Escape Sequence EECHO allows for echo-ing ANSI Escape Sequences (redefines keyboard input for example). Use a dollar sign ($) to represent the ANSI Escape character. Note: requires an ansi driver loaded prior to use. FCBS Usage: fcbs=nnn where nnn is in range 1-255 Sets the number of File Control Blocks to reserve room for. As file control blocks have been replaced by file handles (see files) most applications will not need this value adjusted. e.g. fcbs=4 FILES FILESHIGH Usage: files=nnn where nnn is in range 8-255 (default 8) Specifies how many files allowed open at once (reserves memory necessary to support opening this many files). Note: there are other restrictions, so a given program may not be able to actually open this many A good number is 20, though some programs suggest/require 30, 40, or even 255 e.g. files=20 INSTALL INSTALLHIGH Usage: install=[d:][path]file [options] Load the program specified by d:path\file. Generally used to load TSR (terminate and stay resident) programs with a minimal environment block. The options are for the program itself; refer to documentation that came with your particular software for supported options and usage. e.g. install=nansi.com LASTDRIVE LASTDRIVEHIGH Usage: lastdrive=x where x is last drive letter available for use; A-Z e.g. lastdrive=z NUMLOCK Usage: numlock=on|off Set the keyboard number lock to on or off. e.g. numlock=off REM Usage: rem Your remarks! This provides the ability to place comments within the configuration file. The text following the rem until the end of the line is reached are ignored. This may also be used to temporarily disable loading a particular device or other option. SCREEN Usage: screen=xx Switches into videomode xxx (INT10/11xx/000) where xx should be 0x11 for 28 lines or 0x12 for 43/50 (EGA/VGA) lines SET Usage: set ENVVAR=value Sets the environment variable to provided value. e.g. set HOME=C:\home\me SHELL SHELLHIGH Usage: shell=[d:][path]file [options] Indicates the shell to use; often used to alter COMMAND.COM's behavior. Note: it is command.com that processes AUTOEXEC.BAT; by using the shell option, you can get command.com to process a differently named file (such as FDAUTO.BAT for coexisting with another DOS using different configuration options) or run a completely different command interpreter such as 4DOS or a (unix) sh variant. e.g. shell=C:\COMMAND.COM /E:256 /P STACKS STACKSHIGH Usage: stacks=nn,nnn where nn is in range 0,8-64 and nnn is in range 32-512 Changes number of stacks available nn is number of different stacks and nnn is size in bytes of each one e.g. stacks=16,256 SWITCHAR Usage: switchar=c Sets the default switchar to character c. Where c is a single character that is used to indicate a command line parameter is an option switch. The default is a forward slash (/). Note: This simply sets the value returned by a get switchar query, it will not effect programs that use hardcoded switch characters. e.g. switchar=- SWITCHES Usage: switches=/E[:xxx] /F /K /N /W Adjusts boot time processing behaviour. /F skips the delay checking for F5/F8 keystroke before processing config.sys [equivalent to setting kernel config option skipconfigseconds = 0] /N disables F5/F8 support [equivalent to kernel config skipconfigseconds = -1] (note: with /F a well timed F5/F8 still works, whereas /N completely disables) /K forces treating of keyboard as 86 key keyboard /E enables moving of EBDA (Extended BIOS Data Area), optionally a size in KB may be specified [xxx, in range of 48-1024] /W disables Windows 3.0 from loading WINA20.386 from the root directory (used when \WINA20.386 is moved into a subdirectory, a device line with proper path must be added to Microsoft (R) Windows' SYSTEM.INI [386Enhanced] section.) --- Unsupported, though may be ignored for compatibility. VERSION Usage: version=x.y FreeDOS specific command to specify what DOS version to report. e.g. version=6.2 Advanced - FreeDOS specific CONFIG.SYS menu processing: ------------------------------------------------------- normal FILES=20 DEVICE=MyNetWorkDriver.sys '?' - ALWAYS ask if a single line shall be executed FILES=20 ?DEVICE=MyNetWorkDriver.sys '!' - NEVER ask if a single line shall be executed, even if single stepping !FILES=20 !DOS=HIGH,UMB !BUFFERS=30 DEVICE=MyNetWorkDriver.sys configuration management - you may compose several configurations, using following special commands: MENU MENU select your configuration MENU MENU use (0) for basic configuration MENU use (1) for CDROM operation MENU use (2) for NETWORK configuration MENU MENUDEFAULT=0,1 ( configuration 0, wait 1 second) 1? rem CDROM 1? device=CDROM.SYS 2? rem NETWORK 2? device=MyNetworkDriver.SYS Although this is different than MSDOS menuing possibilities, it allows for selecting from multiple options during bootup while remaining simple. It, however, does not allow for multi-level menuing based configuration schemes. It's also possible to combine menu options, to avoid writing thing every time again. constructions like 0?devicehigh?=cdrom.sys are also possible ("if menu option 0 chosen, ask if you want to load this driver") the selected configuration can be determined in AUTOEXEC.BAT in the environment variable CONFIG like if %CONFIG% == 0 echo configuration 0 selected however, if you have no MENUs in config.sys, then %config% has no value, thus resulting in "IF == 0 echo configuration 0 selected." (which causes syntax errors as there's nothing on the left side of == ) That's why you better use something like: if [%config%]==[0] echo configuration 0 selected. -or- if "%config%"=="0" echo configuration 0 selected. then if there is no menu you have: "IF []==[0] echo configuration 0 selected." (which will of course output nothing) thus my config.sys now looks like !files=20 !dos=high,umb !break=off !buffers=30 !screen=0x12 !lastdrive=z !shellhigh=a:\command.com /p /e:512 /MSG MENU MENU 0 - SoftIce+HIMEM+Network (default) MENU 1 - SoftIce+HIMEM MENU 2 - HIMEM+EMM386 MENU MENUDEFAULT=0,0 01? DEVICE=C:\NUMEGA\S-ICE.EXE /TRA 3000 /SYM 400 012?DEVICE=himem.exe 01? DEVICE=UMBPCI.SYS 2? DEVICE=EMM386.EXE NOEMS 0?device=c:\ntclient\ifshlp.sys DEVICE=ATAPICDD.SYS /D:MSCD000 Full Screen Menus (thanks to Rune Espeseth) Use MENUCOLOR=foreground[,background] to obtain a full screen menu where you can use the arrow keys. Example (note that box drawing characters are used that look strange in other character sets): REM *** This is the FreeDos Config.sys *** REM *** executed before autoexec.bat *** REM *** Set white foreground, red background *** menucolor=7,4 files=20 buffers=20 REM *** The Menu *** MENU MENU ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» MENU º My Menu - FreeDOS rules! º MENU ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹ MENU º º MENU º 1. Test with border º MENU º º MENU º 2. Another test... º MENU º º MENU º 3. Third choice º MENU º º MENU º 4. Fourth choice. º MENU º º MENU ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ MENU MENUDEFAULT=1,10 ( configuration 1, wait 10 seconds) 1? REM 1st choice 1? ECHO You selected menu #1 2? REM 2nd choice 2? ECHO You selected menu #2 3? REM 3rd choice 3? ECHO You selected menu #3 4? REM 4th choice 4? ECHO You selected menu #4 2002-11-28 - Tom Ehlert 2003-07-15 - Bernd Blaauw 2003-09-18 - Bart Oldeman 2004-07-24 - Jeremy Davis