I cant find batterie sto replace worn out ones. Do you know where I can go on-line?

Not sure but try

Press the "ON/AC" button to turn the TI-30Xa on. If the top-left corner of the display reads either "M1," "M2" or "M3," a number is stored in the corresponding memory.

2 Press "0," "STO" and "1" if the number in the corner reads "M1." The upper-left corner should no longer say "M1."

3 Press "0," "STO" and "2" to clear the "M2" memory. Pressing "0," "STO" and "3" clears the number stored in "M3" memory.

Read more : http://www.ehow.com/how_8623666_clear-memory-ti30xa.html

For simple scientific calculators, you have a certain number of memory locations A, B, C, D, X,Y, M. Maybe more,
To store a value in a memory location you use the [STO] or
[SHIFT] [RCL] (STO) sequence.
15 [STO] A (displays 15)
[RCL] A (displays 15)

For graphing calculator, you have 26 memory locations, one in each letter. You use the STO key to store as above. You may also have the possibility to store programs, and on certain models a text editor.

Press
2 5 . 4 STO 1
or
2 5 . 4 STO 2
or
2 5 . 4 STO 3
depending on which storage register you want to put the value into. You can recall the value by pressing RCL 1 or RCL 2 or RCL 3 as appropriate.

This M does no harm. It merely reminds you that you stored something in memory. You can try pressing the AC (Clear All) button. Alternatively, store 0 in all the memories. If I am not mistaken you have 3 memories. Try
0 STO 1 to clear Memory 1
0 STO 2 to clear Memory 2
0 STO 3 to clear Memory 3.

When a memory ontains a number other than 0, M1, M2, or M3 displays.

To clear a single memory, press 0 [sto] 1, 0 [sto] 2, or

0 [sto] 3. To clear all 3 memories (solar only), press [On/AC].

[OFF] ON/C] clears display, errors, all pending operations, constant calculations K, and STAT, but not M1, M2,and M3. Sets DEG angle units, floating-decimal format.
To clear memory M1 : Store 0 in 1
0 [STO] 1 clears M1
0[STO] 2 clears m2
0 [STO] 3 clears M2

try wriggling key while turning steering wheel but if you need to take lock off the steering column remove the battery terminals first!

Hello woodsvincent...The GM ignition switches are designed to be removed with the key in the on position. The lock tumblers in the old switch are likely stuck and/or worn, and if your key itself is worn that makes it worse. Disconnect the negative battery cable, and try another key thats in better shape if possible. Spray a little lubricant in the switch, wiggle and work the key and see if you can get it to turn to the on position...if you can, leave it there!! The switch can be replaced if you can't get it to turn, but it's a lot more labor intensive.
Let me know how it goes...and i will further advise.
Good luck and i hope this helps...

Remove the six screws on the back cover. After the batteries are installed you need to reset the board. There is a little reset area that needs to be shorted to get the calculator back to normal. Look closely at the circuit board- You'll see a little circle next to the word reset. Its near the middle of the board. Wet your finger- press it on the circle. It should short. Blow it dry with your breath. It should work...