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Can I enter text in lower case on the TI-83 family, TI-84 Plus family, or TI-Nspire handheld in TI-84 Plus mode? It is not possible to enter lower case letters directly on the TI-83 family, TI-84 Plus family, or TI-Nspire in TI-84 Plus mode. However, users with a TI-83 Plus family, TI-84 Plus family, or TI-Nspire in TI-84 Plus mode have an option available.Upper and lower case letters may be entered by using the NoteFolio™ App for the TI-83 Plus and TI-84 Plus Family.This App will work with the TI Keyboard, however, it is important to note that the TI Keyboard will not enter lower case letters on its own.Please see the TI-83 family and TI-84 Plus family guidebooks for additional information.Note: TI-Nspire in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook.

Anyway, I have to say that this isn't really a lie. You *can't* enter lowercase letters with the keypad alone. You need additional software to unlock that capability. It's little different than the fact that your computer has the ability to run just about every game imaginable, but you can't access that capability unless you've purchased the software to do so.