Greg Maletic on X: "Today's calculator: the Texas Instruments SR-22 (1973, $350). Designed for programmers, it does math in decimal, hex, or octal! https://t.co/IhHkyq9xc4" / X
Texas Instruments Calculator | 1967 development of handheld … | Flickr
File:Vintage Texas Instruments Model SR-10 Pocket LED Calculator, First of a Line of TI "Slide Rule" Models, Sealed Battery, Price - 149.95 USD, Circa 1972 (14592862578).jpg - Wikimedia Commons