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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://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.
* [http://www.elisoftware.org/index.php/Main_Page Eli's Software Encyclopedia] = This software focused website includes many articles about TI-99/4A software. It's written using MediaWiki (the same software as this website and Wikipedia).
* [http://www.everygamegoing.com Every Game Going] = A huge database of video games and software developers for pretty much any console.
* [https://gamefaqs.gamespot.com GameFAQs] = A large database of gaming information for many consoles, not just the TI.
* [https://dadgum.com/giantlist The Giant List of Classic Games Programmers] = Exactly what it sounds like, this site focuses on programmers, and the games and systems they worked on, specifically on systems pre-NES.
* [https://archive.org/search.php?query=ti+99%2F4a&sin=TXT Internet Archive: Texas Instrument TI 99/4A Books Collection] = This is a collection of scanned manuals, magazine, and other TI-99/4A references about the TI-99/4A. Not easily searchable, but fun to peruse. While you're visiting the [https://archive.org/ Internet Archive], search it for other TI-99/4A texts that haven't made it into the TI-99/4A Collection.
* [http://www.mainbyte.com Mainbyte] = A retrogaming website including information about the TS 1000, TI-99/4A, TRS 80 PC-4, and the VIC-20.
* [http://www.mobygames.com Moby Games] = A general video game website that hosts several TI-99/4A game pages.
* [https://www.ninerpedia.org/wiki/Main_Page Ninerpedia] = A great resource run on Mediawiki (the same software as Wikipedia and this website).
* [http://oldcomputers.net/ti994a.html Obsolete Technology Website] = This website is dedicated to preserving the history, and important background information covering computing devices from 1970 through 1993.
* [http://www.pixelatedarcade.com/ Pixelated Arcade] = Refers to itself as "A museum of vintage video games featuring photos, information, screenshots, artwork, and more." It really contains what it says.
* [http://www.rediware.com/ti994a/ti994a.html Rediware's TI-99/4A Page] = Rediware has information about software and other items, including a fairly extensive set of TI-99/4A pages. I link to Rediware's main TI-99/4As landing page.
* [http://my.stratos.net/~hewston95/RTM/RTM_Home.htm Retrogaming Times Monthly] = An archive of an older website covering multiple 1980's computing devices.
* [http://www.tigameshelf.net TI Game Shelf] = This is a unique site that I rarely, if ever, reference on any pages within my site. It hosts several games, most of which never appeared in command module format. Many of them are even newer creations folks are still making today. A great reference when you're looking for something unique and fresh for your TI-99/4A or an emulator.
* [http://www.unige.ch/medecine/nouspikel/ti99/titechpages.htm The TI-99/4A Tech Pages] = A mostly hardware focused website.
* [http://www.videogamehouse.net TI-99/4A Video Game House] = A strictly TI-99/4A page covering many of the most popular video games for the TI-99/4A. '''One of my favorite resources'''. It hasn't been updated for a while, but neither has the TI-99/4A, so it's totally legit.
* [http://ftp.whtech.com/ Whtech] = A large database of downloadable files dealing with the TI-99/4A. Although there is a ton of information, the website isn't terribly intuitive nor visually appealing. But, if you know what you're looking for, Whtech probably has it.
* [http://wikipedia.org WikiPedia] = A site I'm sure everyone is familiar with. This presents many articles on TI-99/4A hardware and software.