The HP-37s scientific calculator?

[John Keith]

(12-30-2020 03:33 PM)Maximilian Hohmann Wrote:  Mass storage access (either or all of Bluetooth, SD card, USB). With today's memory sizes a programmable calculator without a means of permanently storing and sharing data and programs does not make any sense at all. My preference would be plain text storage on an SD card because that would not require any software on the other side and there will still be easy ways to access it ten years from now.

I could never understand why they made the 35s with large enough memory to store many programs but no way to back up or restore them. Even if it were free of bugs the lack of I/O makes it worthless for serious programming IMHO.
I use mine as my workshop calculator because I won't shed a tear if it is damaged.