Difference between pocket computer and programmable calculator?

[Steve Simpkin]

I recall that when they started showing up in the early 1980's, the big reason we considered them "Pocket Computers" instead of programmable calculators is that they had QWERTY keyboards, and alphanumeric display and, most importantly, they were programmable in the BASIC computer language. These features together mimicked the main characteristics of the typical personal computer of the time.

Here is an interesting article that has a brief history of the "Pocket Computer".
https://ieeexplore.ieee.org/stamp/stamp....er=9040018