Casio DT-970 - Manual (Page 26)

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Resetting the Handheld Terminal
Resetting the Handheld Terminal is the same as restarting a PC. Performing a reset
causes all unsaved inputs and edits to be lost, but data that is already stored in the
memory as well as all settings should be unaffected.
Use reset to restore normal operation whenever the Handheld Terminal operates
abnormally due to misoperation or some other reason.
Use a stylus to press the reset switch on the front of the DT-970.
This starts the reset operation.
Do not use a toothpick or pencil or other object
whose tip may break off when pressing the reset
switch. Otherwise there is a risk of damage. *