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ramon_ea1gth · 08-29-2020, 11:30 AM

(07-08-2020 01:50 AM)Carsen Wrote:
(07-07-2020 04:32 PM)franz.b Wrote: Of course, each of us has his preferences and habits. But the HIST key is exactly the same as the up arrow key. it's an absolutely useless duplicate, Of course, each of us has his preferences and habits. But the HIST key is exactly the same as the up arrow key. it is an absolutely useless duplication, if it has no other uses unknown to me.

Not quite. The HIST key activates the interactive stack while in Input forms like TVM or numerical solver.

Also, it is useful in Algebraic mode as you need the HIST key to access entries in the stack while the command line is active.

I agree: after coming from my HP48GX, I had the same feelings about the HIST key. But I discovered that, e.g., when editing a user-RPL program, while in the editor, it is easy to go to the stack to pick stuff to be inserted using HIST, something not possible with the arrow-up key. So it is more useful that it looks.
Of course, from my personal taste, I prefer some choices of the key mapping in the HP48GX vs HP50g:
- direct [CST] key vs [LS][CUSTOM];
- [LS][RAD] vs [MODE]+[select angle mode with arrows];
- [RS][ANGLE] (labelled on keyboard) vs. [ALPHA][RS][6] (no angle label). Fortunately, this went back in the HP-Prime.

But these are minor issues when comparing screens, speed (for practical purposes) and the symbolic engine in the HP50g, consistent with the RPL/RPN implementation. I also added some software from http://www.software49g.gmxhome.de/ that is still maintained with updates and it is a nice and useful machine for me as I started in the RPL/RPN world. It uses standard AAA batteries and can be powered with the USB cable. It has a huge background in terms of firmware, software and usability from years of development. And the HP48GX and mainly the HP49 series manuals are a great resource to review matter.