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Sun, 16 Feb 2003 | Sent in by Thesmall1
1. Hold Down The a b/c , 1 , 2 and 3 buttons all at the same time.
2. While still holding down the four buttons push the on/ac button.
3. you will see -8888888888 -88 and most of the caculators functions if you push the = button the screen shows the other functions to.
I have only tried this on a TI-30Xa Solar but this may work on other TI caculators as well and I believe it hase to be a Solar calculator so you have the "on/ac" button.