Orion ti-84+, Руководство пользователя

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When the Enter key is pressed at the end of an expression, the answer is announced
and placed in the history.
Expression Editing (Delete and Insert)
When entering or editing a previously entered equation that is copied from the history,
you can move through the equation using the TI-84 left and right navigation keys. As
you arrow left or right, your cursor lands on individual items. In most cases, the item
will be a character or a digit, but it can also be a symbol such as sine, cosine, or a
matrix name. The symbols take up one spot in an equation and can be replaced or
deleted like any other character or digit.
The default editing mode when moving through an equation is Overtype. To change
an item your cursor is on, just enter a new value for the item you want to change. For
example, if your cursor is on the "+" sign and you want to switch the sign to minus,
enter "-" and it will Overtype the "+".
To switch to Insert mode, press the 2nd key followed by the Del key. You will remain
in Insert mode until you press 2nd followed by Del key again or until you press a TI-
84 Plus navigation key. For example, to change the number under your cursor from
"8" to "78," press the
2nd key followed by the Del key followed by the numeral 7.
To delete the item under the cursor, press the Del key. When the character is deleted,
the next character will be moved under the cursor and announced, unless there are no
more characters.
If the TI-84 Plus cursor is unable to move when a navigation key is pressed (most
frequently because it has reached the limits of the navigation area), a tone is generated
to indicate this status.
If the TI-84 Plus is in History mode (previous item is selected), some editing
operations are not supported by the calculator. In this case, a tone will sound to
indicate that an error has occurred.
Copying the Previous Expression