Need to clear m1,m2 & m3

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

They're telling you that you have non-zero values stored in M1, M2, and M3. To clear any one of them, store 0 in it by pressing 0 n where n is 1, 2, or 3. To clear all three of them at once, press ON/AC.

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].

To delete data from memory you store 0 in the memory
To clear Memory 1 (M1) store 0 in it
Para borrar la memoria M1, almacenar 0 en M1 (Google translate)
0 [STO] 1 clears M1
0 [STO] 2 clears M2
0 [STO] 3 clears M3

The M1 in the display remind you that the M1 memory contains a number that is not equal to 0. So, to get rid of M1, M2, or M3, you shoild store the value 0 in them.
0 [STO] 1 stores 0 in M1, and thus erases its contents: M1 disappears
0 [STO] 2 stores 0 in M2, and thus erases its contents:M2 disappears
0 [STO] 3 stores 0 in M3, and thus erases its contents:M3 disappears.

[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

Press 0 [STO] 1 to clear the Memory M1. Indicator M1 will disappear.
Press 0 [STO] 2 to clear the Memory M2. Indicator M2 will disappear.

Hello,
Your calculator has 3 memories (M1, M2,M3)
To store the number 170 in M1 use 170[STO]1
To recall a number from M1 use [RCL]1
To add a number to the content of M1 [2nd][SUM]1 (adds displayed value to contents of M1).
[2nd][EXC] 2 exchanges the value already displayed with the contents of M2:

To erase (clear) a memory register, just store 0 in it.

Hope it helps.

Clear the display so that zero shows, then press STO M2 to store zero in the M2 registry. Any time there is a non-zero number stored in M1, M2 or M3, you will see those memories in the display to remind you there's something stored. There is no "clear memory" function on the TI-30XA, you have to store zero in the memory to clear M1, M2 or M3 from the display.

David

screen has (m3)and (m1) in upper left corner, have not been able to totally clear screen.