When DOS boots up, it looks in the root directory of the boot disk for a

 text file named CONFIG.SYS.  If that file exists, it is read and processed

 as a list of configuration commands.

  Command     Function                 Command   Function

  BREAK=      Ctrl-Break test level   INSTALLHIGH= load TSRs into UMB

  BUFFERS=    # of disk I/O buffers   MENUITEM=    menu text & action

  COUNTRY=    country-dependant info  MENUCOLOR=   menu colors

  cmd?=       conditional execution   MENUDEFAULT= default and time-out

  DEVICE=     install device driver   NUMLOCK=     state of NumLock

  DEVICEHIGH= install driver in UMB   REM or ;     comments in CONFIG.SYS

  DRIVPARM=   parms for disk drivers  SET          e-vars in CONFIG.SYS

  FCBS=       max open FCBs           SHELL=       install cmd processor

  LASTDRIVE=  SUBST drive ID limit    STACKS=      hdwr int stack sizes

  FILES=      max # of file handles   SUBMENU=     set up a submenu

  INCLUDE=    run cmds in a block     SWITCHAR=    cmd-line switch char

  INSTALL=    load TSRs               SWITCHES=    kydb, boot opts, etc.

 CONFIG.SYS is a standard text file^, created by any text editor.  Changes

 to CONFIG.SYS take effect only after you restart DOS.

See Also: Enhanced CONFIG.SYS Options

          MultiConfig Menus

          Device Drivers

          System Startup Sequence