Picture from Jyri Tuulos webpage (Creative Commons licence)
If you have an Android system on your phone, check out the retro (or is it?) calculator, TI-86! It looks quite similar to previous TI-84s also…
Download the app free from Android Market, or here: http://www.appbrain.com/app/ti-86/net.supware.ti86
EDIT: Since the calculator I have been using the most is the TI83 / TI84 (They are quite similar) I soon found the TI-83 app in the Android Market instead: http://www.appbrain.com/app/ti-83/net.supware.ti83 🙂
The cheap researcher 
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