FreeDOS reads the config.sys file at startup to configure the DOS system. It is read before the autoexec.bat file is run.
There is a special set of commands for use in the config.sys file.
DOS prompt and
batch file commands generally cannot be used in config.sys.
Config.sys lines that begin with ! will be processed even when single stepping.
!files=20
Lines that begin with ? will be queried: the user will be asked for confirmation before that line is run.
?device=MAYBE.SYS
See also the menu config.sys command.
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