How to handle "On" key - & - Safe file storage

[Joe Horn]

(10-25-2017 06:50 PM)Tim Wessman Wrote:  Its been a while since I've done any programming on userRPL stuff for the 50g, but I'm pretty sure the ON key works the same way there as on Prime and always will interrupt. Is this not the case?

It always generates a system interrupt, but will not interrupt a running program if an IFERR is active. Inside an IFERR, pressing ON generates an error (ERRN = #0) and branches to the THEN clause. This lets the programmer control what happens when ON is pressed.