Casio IT-2000W - Manual (Page 20)

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The following table summarizes the power-on processes provided for this terminal.
System Menu boot
process Always executes CONFIG.SYS and AUTOEXEC.BAT located
in drive (C:) for starting up the MS-DOS.
Application boot process Searches for CONFIG.SYS and AUTOEXEC.BAT prepared
by the user and starts up MS-DOS from the drive where they are
located.
Resume process Restores the memory conditions that existed before the power
was turned off and continues operating according to the
conditions.