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There is a website of a person who catalogs Texas Instruments calculators. You can wonder over to the graphing calculator section to see how many different graphing calculators they made along with a bit of information on each one.
http://datamath.org/
I love websites like this.
That's web 1.0. Many of us had sites like this on Geocities and Tripod back in the day.
I absolutely love them too because they're so content dense where as today this would be a 15 item list where you had to click a new page to see each one while reading several paragraphs of what sounds like the most generic, 6th-grade book report on each one "The TI-84 is a calculator. Many people use calculators to do math..."
I love that you can tell they're a product of passion. Someone was just really into something and wanted to share the info with the world. There's something beautiful about that.