How is the TI-83 calculator still around? (repost)

Reposting a popular older post for Thanksgiving break

Texas Instruments TI-84 PLUS CAS Graphing Calculator, Black (TI84PLUS)

Texas Instruments 84 Plus Ce Graphing Calculator - Bionic Blue : Target

TI-83 Calculator, General

The TI-83 Plus is an easy-to-use graphing calculator for math and science that lets students graph and compare functions, as well as perform data plotting and analysis. Its FLASH ROM memory allows students to update and add software applications (Apps). Count on TI calculators at exam time. You can use this TI graphing calculator on the PSAT, SAT and ACT college entrance exams, IB and AP tests.

Texas Instruments Ti-83 Plus Graphing Calculator

Very Good Condition Texas Instruments TI-83 Plus Programmable Graphing Calculator, battery cover, and dust plastic jacket only. The Refurbished Texas

Restored Texas Instruments TI-83 Plus Programmable Graphing Calculator (Refurbished)

Texas Instruments TI-83 Plus Multifunction Graphing Calculator 4 Fun Preloaded Games + The Ability to Load Your Own Great, Dependable Option for

Texas Instruments TI-83 Plus Programmable Graphing Calculator (Packaging and Colors May Vary)

Calculator Tutorial - Intro to the TI -83 Plus

TI-83 Plus Review

Calculator Ti-83 Premium CE