Fun fact: Radio Shack sold computer tape cassettes until the late 1980s for its TRS line. Incredible how they had decade old obsolete technology on the shelves.
That isn't unique to Radio Shack or the TRS line. Lots of systems (including Atari, Sinclair, Commodore) used cassettes well into the 80s, especially in Europe.
The last time I remember using a tape to save a program was in 1983. That's the year my dad bought the Peripheral Expansion System for our TI/99-4a, which came with a single-sided 5.25 inch floppy drive.
Fun fact: Radio Shack sold computer tape cassettes until the late 1980s for its TRS line. Incredible how they had decade old obsolete technology on the shelves.