Swapping Registers on HP calculators

[n1msr]

Werner,

Your code is short, and uses the '1' on the stack to save keystrokes so thank you.
I don't think you can do x <> A though, unfortunately :-) I realise you didn't have your 15c with you when you replied.

STO 0
RCL+ 3
STO 1
RCL A
1
RCL+ 4
STO 1
X<>Y
X<> A <-- I don't think this is possible. Would that it were :-)
1
R^
STO g A