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* [http://www.99er.net 99er - The TI-99/4A Home Computer Page] = '''One of my favorite TI-99/4A websites'''. This site provides a ton of information about the computer and includes downloads of many TI-99/4A manuals (although most, I've found, are of lower quality).
* [http://www.ricks-graphics.co.uk/area99 Area99 - A unique, though not information-rich TI-99 website.
* [http://ti99.atariage.com/ AtariAge TI-99/4A Forum] = A great TI-99/4A forum covering many topics and offering multiple downloads.
* [http://www.computinghistory.org.uk/ Centre for Computing History] = This is a UK-based, general computing history website that has numerous articles involving the TI-99/4A.