Texas Instruments TI-84 Calculator

TI-84 graphing calculator has barely changed since the mid-1990s. Costing $100 for a device with a pixelated black and white screen and 480 KB of RAM while a phone in your pocket does everything it does and more is one of the strangest pricing stories in consumer electronics. Buttons have a specific tactile click that I associate with high school math. Layout with the graph key, the mode key, and the number pad in a grid has become muscle memory for anyone who took AP calculus. That TI dominates the market not because the hardware is good but because the College Board approves the TI-84 for standardized tests. That institutional lock-in means every student buying a graphing calculator is essentially buying permission to use it during an exam. Plotting equations and seeing how changing a coefficient alters the curve in real time is genuinely useful for learning even if the same function exists in free apps. Build quality is solid, the thing survives drops and backpack abuse for 4 years of high school. AAA batteries last long enough that you rarely think about power. At $100, TI is a case study in how a product persists through institutional dependency rather than through design merit. The pricing is worth questioning even if the durability is not.