TI-92 Tutorial

Excel 2007
Tutorial

Memory for the TI-92 Calculator

Memory Topics:
How to transfer files from TI-92 to TI-92.
VAR-LINK
F1
F2
F3
F4
F5
F6

MEM

The memory window shows the total memory allocation set aside for each type of variable To check the current memory. Press the button then 6 for the MEM key.


The window above shows the current memory allocation in my TI-92 calculator. I currently have 26,428 bytes of free memory space. Most of the memory is used by the system and stored programs. All variables stored in the TI-92 memory fall into one of the categories shown on this screen.

To see how the memory changes, follow the procedure below. We will store a number as a variable. Before we start, check the memory allocated to the system and expressions. I currently have 36 bytes used for expressions and 67,019 bytes used for the system..

1.) Press the ESC key and return to the Home page.

2.) To assign the number 1.234 to the variable "x", type 1.234 and press the STO

button (located to the right of the 2nd button). This will place an arrow next to the number 1.234. Then type an x and press ENTER. Now the variable a is assigned the value 1.234.


3.) To see what affect assigning the letter x, the number 1.234, has on the memory, go

back to the memory window. Look at the number next to Expr. The number should have increased by 12. Press ESC to go back to the Home screen.


Once a variable is stored in memory, it can be manipulated as a number. Press x then enter. The output is 1.234.


4.) Multiply the variable x times 5. Type in 5x and press ENTER. You do not need a

multiplication symbol next to the 5. (But you must insert a multiplication symbol when multiplying two variables.)


5.) Store the number 2 as the variable "abc". Type 2, press STO, the press enter.


6.) Multiply the variable x times abc. Type x, then a multiplication symbol, then abc.

If you do not insert a multiplication symbol, the calculator accepts the entry xabc as a variable.


7.) It is important to clear variables often especially if you run a lot of programs.

Once a variable is stored in memory, it will stay there until cleared. Fortunately there is an easy way to clear all one character variables. Press F6 (Clear a-z).


When you press Enter, only the one character are variables cleared from memory. Other multiple variables can be cleared by using F1 (RESET) from the memory window (not recommended at this point) or editing them from the VAR-LINK window. If you go the home screen and now type an x, only an x will appear as an answer.


VAR-LINK

Press and then the subtraction key for the VAR-LINK window.


The VAR-LINK screen will show you the individual variables and the amount of memory used by each. Next to each variable, there is a three of four letter symbol describing the type of variable. The variable types are listed below.

Type - Description

  • DATA - Data
  • EXPR - Expression (including numeric values)
  • FIG - Geometry session
  • FUNC - Function
  • GDB - Graph database
  • LIST - List
  • MAC - Macro for a geometry session
  • MAT - Matrix
  • PIC - Picture of a graph
  • PRGM - Program
  • STR - String
  • TEXT - Text Editor session

You should see abc and a value next to EXPR under the MAIN folder.

There are two techniques that can be used to clear the variable abc. One method is to highlight the expression and pressing the delete key. The other is to use the delete option in the F1 (Manage) tab.

F1 (Manage)

The other delete is to press F1 and 1: Delete.


The other options under the F1 tab allow you the ability to create new folders, copy or rename variables and lock and unlock variables.

F2 (View)

The F2 (View) tab allows you the ability to customize the folder a variable views.


F3 (Link)

The F3 (Link) tab is used to send and receive variables between TI-92 calculators.


Transfer Procedure

1.) Connect the two TI-92 calculator through the I/O port. Use the connection cable

that is supplied with the calculators.


2.) The calculator that is to receive the file(s), must be set to 2: Receive. If the

connection is made properly, the bottom of the screen should say VAR-LINK: WAITING TO RECEIVE.


If you get the screen below, press the connection cable in firmly and redo procedure 2.)


3.) Put a check mark on each variable that you would like to transfer from the

sending calculator. Press F3 (Link) then 1: Send.


4.) The file(s) will be transferred.


(Note: You do not use this option when using the TI-GRAPH LINKS program.

F4 (Ö)

The F4 tab puts a check next to variables or folders.


This option is used if you want to operate on multiple variables.

F5 (All)

The tab F5 gives selection options.


F6 (Contents)

A variable can be viewed by highlighting it an pressing F6 (Contents)