Casio IT-2000D - Manual (Page 76)

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Key Operation Function
2 or 8 key Selects the objective item (drive selection screen).
0 key Does not perform formatting (formatting start screen).
1 key Starts formatting (formatting start screen).
. (decimal) key Toggles YES and NO options of formatting.
RET key Confirms the current setting.
CLR key Cancels the current setting.
Others Invalid.