Orion TI-84 Plus Talking Graphing Calculator User Guide
Version 1.0
Orbit Research
Proprietary Information
22
7.1.1
Entering Expressions
Orion announces each key you press when entering an expression. When you
press a modifier key (such as
Alpha
or
2nd
), Orion also announces that key and
the modified function of the next key you press.
When the
+
(add),
-
(subtract),
*
(multiply), or
/
(divide) keys are pressed, without
entering any digits first, the calculator assumes that operation should be
performed on the previous answer. This is indicated by announcing
Answer
followed by the text of the key pressed.
The following calculator keys ARE NOT ANNOUNCED when pressed:
•
Enter
•
Up Arrow
•
Down Arrow
•
Left Arrow
•
Right Arrow
The answer is announced and placed in the history when the
Enter
key is
pressed at the end of an expression.
7.1.2
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 is 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.
Overtype
is the default editing mode when moving through an equation. . You
can easily change an item your cursor is on, by just entering 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 Overtypes the "+".
To switch to
Insert mode
, press the
2nd
key followed by the
Del
key. You 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 is moved under the cursor and announced, unless
there are no more characters.
