Difference between pocket computer and programmable calculator?

[EdS2]

The non-QWERTY Casio is an interesting case... I'm going to suggest that having the alphabet as the primary markings on the keys is significant. It's successful in categorising TI's 74 and 95!

And by this criterion HP's marketing materials for the 41 don't quite line up, but that's marketing materials for you.

So, entering text is primary on a pocket computer, whereas performing calculations is primary on a pocket calculator.

Line-based programming would for me be a big distinguishing factor.

But categorisation is an order we impose on the universe - things don't really sit in strict categories, so we need to do what's useful.