Casio IT-2000D - Manual (Page 14)

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Do not input “^P” from the DOS prompt. If it is input, “^P” requests DOS to redirect console
output to printer. However, the IT-2000 does not have the printer being installed, it will enter
into wait mode.
For more information about the system library refer to Chapter 7.6.2 “System Library”.
Also, refer to Chapter 2.2.4 “Battery Voltage Monitoring Process” for information about the
low-battery voltage notification function.