Casio IT-2000D - Manual (Page 48)

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Card Lock Switch
The IT-2000 has a card lock switch to prevent accidental removal of the card. Any card can be made
usable only after it has been inserted in the slot and the switch has been locked properly. However,
since some types of cards do not allow this card lock switch to be closed, a library routine to disable
this switch is supported. For more information refer to Chapter 7.6.2 "System Library”.