LAST on HP20S

[jbhp55]

There was a post #11 which I cannot find anymore, was it retracted?
The point it made was that LAST recalls the content of the LAST register. The question would be: what is stored in it, and when?

I think we can conclude that the use of LAST on the HP20S is subject to an unnecessarily complex set of rules. Unless used in exactly the intended way, the result may be surprising.
I think it would be much easier to understand if it would just retain the last value displayed as a result. I had a Casio which had an 'ANS' key which worked like that.

But ultimately, I agree that RPN (or RPL) gives much better functionality in this respect. (including the LAST x command).

Thanks for all the reactions!