Swapping Registers on HP calculators

[chromos]

(03-27-2024 12:50 PM)n1msr Wrote:  PS is it possible to turn on/off USER mode on the 15c programmatically? - I haven't found a way.

I've only had the "true RPN" calculator for a while, so it's possible that you're asking about something else. But if I understand your question correctly, look in the thread https://www.hpmuseum.org/forum/thread-21466.html where it is mentioned (and yes, it is possible).