Casio IT-2000W - Manual (Page 71)

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Key Operation Function
8 key Increases the RAM disk size.
2 key Decreases the RAM disk size.
RET key Confirms the currently selected RAM disk size and exits this
operation.
CLR key Cancels the currently selected RAM disk size.
1 key Formats the RAM disk (Format confirmation screen).
0 key Aborts formatting of the RAM disk.
Others Invalid.
Operations with the touch panel are not permitted.