Casio IT-2000W Technical Reference Manual page 20

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