get a new one
The TI-83 has a very good screen and excellent graphics.
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The TI-83 series was released in 1996.
No, in order to download apps to your TI-83, you need a cable that connects your calculator and the computer, or a cable to connect to another TI-83.
The TI-84 is a graphing calculater. It is mostly just an update to the TI-83 calculater.
Yes
Some of the features of the TI-83 Plus, are: upgradable operating system and software; preloaded apps; compatible with TI-84 Plus and TI-84 Plus Silver Edition.
"http://wiki.answers.com/Q/How_do_you_put_games_on_the_TI-83"
There isn't a sec key on the TI-83 Plus. Secant is 1/cosine, which is what is used to find secant on a TI-83 Plus. For example, to find the secant of 4, enter 1/sec(4).
Yes, it keeps tracks of the keystrokes until you clear the screen.
graphing calculators only. TI-83 and TI-84 calculators.
The TI-83 graphing calculator was developed by Texas Instruments, a company known for its innovations in educational technology. The TI-83 was first released in 1996, with a design and features aimed at helping students learn mathematics more effectively. While there isn't a single inventor attributed to the TI-83, it was the result of a team effort within Texas Instruments.