fx-82MS fx-82TL fx-98060GII TI-83
ALPHA
On a Casio calculator you can switch keyboard operation
ALPHA
The keyboard returns to its primary functions when you press ALPHA again. Be sure to select RUN-MAT mode with SET UP Input/Output Line.
Explanation
Above the keys is the alternate description in red. The switch is shown on the screen with a blinking A or 
. In the menu bar at the bottum of the display area a function key menu appears.
Mat→List(Mat F,2)→Li:▷ {-1,1,4} 123×456 56088 Ref Mat E Done "ABC
' Apostrophe " Double quote ~ In between
Example 1
To enter the character Z
ALPHA Z Z
Example 2
To undo a fraction
INS UNDO 1 2 3 4 5 ab/c ALPHA DEL 12345
Example 3
To assign a value of 10 to variables A through F
~ 1 0 ➞ A ALPHA F3 F EXE 10➔A~F 10
You cannot use r or θ as a variable name here.
Example 4
To return to the primary keyboard functions after entering the string "ABC"
A-LOCK " " SHIFT ALPHA F2 A B C F2 ALPHA "ABC"
that subsequently is assigned to Str 1
▷ Str ➞ VARS F6 F5 1 EXE "ABC"➔Str 1 Done