Texas Instruments Titanium TI-89 User manual

Using a Scientific Calculator

•How much memory does the TI 89 have?
•The TI-89 has 188k of RAM and 384k of memory that
can be used for archiving programs, making a total
memory of 572k
•How large is the TI-89's screen?
•The TI-89's screen is 160x100 pixels
Hardware on the TI-89

•What type of processor does the TI-89 have?
•The TI-89, like the TI-92 and TI-92 Plus, uses a 68k
Motorola processor.
•The processors are 10 MHz.
•On TI-89 Titanium they are 12 MHz.
•You can double the speed of the TI-89 by over
clocking.
•Information about this is located at the TI-89
Acceleration Pages.
•Note: this is a risky process that could potentially
damage your calculator.
Hardware on the TI-89

•Step 1 Type in the number you wish to
convert. Then press the blue 2nd key
followed by the blue Units key (the #3 on
your keypad).
•Step 2 A list will pop up. Scroll down to
select the category for your unit, then use the
right arrow key and the down/up keys to
make your selection.
•Step 3 Here we wish to convert 3 ft to
meters. This is a unit of length, so the Length
category has been selected, and ft has been
chosen for our original unit. (Note, you may
also type in the unit if you know the
abbreviation).
•Step 4 To convert the units, press the 2nd
key again and then the convert key (the blue
triangle pointing to the right, above the Mode
key).
2nd Key
Units Key
Converter Key

•Step 1 Input a decimal you wish to see as a fraction such as:
.56
•Step 2 Hit MODE and scroll down to Exact/Approx and hit
Exact. The screen will come back to your home screen and the
number you wanted to change to fraction will be in the input
bar.
•Step 3 Hit enter and the screen should come up with
something like this: .56 4/25

•Step 1 Input fraction in home input bar.
•Step 2 Hit MODE and scroll down to Exact/Approx and hit
Approx. The screen will come back to your home screen and
the number you wanted to convert to decimal will be in the
input bar.
•Step 3 Hit enter and the screen will come up with:
14/ 25 .56

There are 3 different modes in the TI 89 calculator.
•The first one is Normal this means that:
34.2
+ 34.5
68.7
•The next selectable mode is Scientific. This means that:
34.2
+ 34.5
6.87e1
•The last mode is Engineering. This means that:
34.2
+ 34.5
68.7e0

•Step 1 Go into your MODE and scroll down until you reach
Exact/Approx and change it to Exact.
•Step 2 Type in what you would like to convert to binary such as 455 in
the address box at the bottom of the main screen.
•Step 3 Hit the blue 2nd and the number 5. This will take you to the
MATH menu.
•Step 4 Find the Base and hit the >. This will take you to another
screen.
•Step 5 Hit 4 for Binary. You will return to the home screen with the
number you wanted converted with a > Bin. It will appear as 455 >Bin.
•Step 6 Hit enter to display your decimal number in Binary format.

This function will allow you to solve for a specific variable. For
example, solve for: 3x^3-2x*y+3y=2
•Step 1 On your home screen press F2 and then press 1 or enter.
•Step 2 Enter in the equation after solve as:
solve(3x^3-2x*y+3y=2,y)
•Step 3 Press enter and it will solve for y.
You can also solve for a system of equations using the solve
function. For example: 3x-5y=4 and -2x+5y=6
•Step 1 On your home screen press F2 and then press 1 or enter .
•Step 2 Enter in the equation after solve as so: solve(3x-5y=4
and -2x+5y=6, {x,y}). *You can access the word and by
pressing 2ND , 5, 8, 8.
•Step 3 Press enter and it will solve for x and y.

Like the solve function, you can use the matrix function to solve
for a system of equations. For example:
3x-5y=4 and -2x+5y=6
•Step 1 Press 2nd 5(MATH), 4(Matrix), and then 5(simult).
•Step 2 Enter the coefficients as a matrix and the results as a
constant column matrix as so: simult([3,-5;-2,5],[4;6])
•Step 3 Press enter. The value for xon top and yon bottom.
Using the same equations, you can solve for x and y using the rref
function.
•Step 1 Press 2nd 5(MATH), 4(Matrix), and then 4(rref).
•Step 2 Enter an augmented matrix, this contains the variables x,
y, and c where c is the constant. It should look like this: rref([3,-
5,4;-2,5,6])
•Step 3 Press enter; xis on top, yis on bottom.