Everyday use of programmable Calculators without Continuous Memory/Storage Devices

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(12-17-2022 06:04 PM)Siegfried Wrote:  Quite a few of the early cheaper programmable HP calculators did not have persistent memory or a method to store programs. (Like the HP55, 25, 33E and 38E; I don't think there was a 29 or 34 without C.)

I wonder how people used those. Did they program them as required, keep a written "library" of programs to type in when solving a particular problem or just leave them switched on to save their programming work?

Overall the drawback of having to enter programs again and again can't have been too bad as these models don't seem to be particularly rare.

I would appreciate any recollections on this.

No memory or card or USB or whatever for programm saving?
NoGo for me.
My HP12 is only for + and -.
I made already programs with several 100lines and a re-use was every time planned.