Democracy Dies in Darkness

The unstoppable TI-84 Plus: How an outdated calculator still holds a monopoly on classrooms

September 2, 2014 at 7:00 a.m. EDT
While popular phones, laptops, PCs and music players have changed significantly in the last 10 years, the TI-84 Plus has remained more or less a constant.

In the ruthlessly competitive world of technology, where companies rush the latest gadget to market and slash prices to stay competitive, the TI-84 Plus is an anomaly.

Texas Instruments released the graphing calculator in 2004, and continues to sell it today. The base model still has 480 kilobytes of ROM and 24 kilobytes of RAM. Its black-and-white screen remains 96×64 pixels. For 10 years its MSRP has been $150, but depending on the retailer, today it generally sells for between $90 and $120. The only changes have come in software updates.