The TI-35 was from around the same period, late 1970s or early 1980s. There was also a desktop model that you could program using punch wafers, small plastic equivalents of the familiar punch cards (about the size of a folded Motorola Flip TracPhone but thin as a credit card). It was really expensive, over 2k at the time but great for repetitive calculations like signal degradation in CATV cable cascades and through amplifiers.