HP-50g dangerous L-Shift STO shortcut

[Joe Horn]

(11-11-2020 01:03 AM)John Keith Wrote:  From an old post by Joe Horn:

If you accidentally overwrite a variable using [LS] [var] immediately execute LASTARG STO LASTARG.

The same is true if you use the STO key itself to accidentally overwrite a variable's former contents. Just do LASTARG STO LASTARG and the overwritten variable reverts to its former contents.

A similar recovery feature is built into the RPL models' PURGE key. If you PURGE a name, then realize you shouldn't have, just do LASTARG STO and the PURGE is undone.

This is all explained on page G-3 of the 50g AUR manual.