HP 12C ATSAM4L version: ON-f-ENTER

[rprosperi]

This was found and reported by (of course) Joe Horn last year. Note that it also disables the auto-power-off feature after some number of minutes. To re-enable the ON key, press and hold f+ENTER then press ON.

There's no info if this was done on purpose (e.g. for diags or battery life testing, etc.) or if it was a simple bug. The fact that the mode can be both enabled and disabled suggests it was there for some purpose, but there were other deleterious side-effects noted (some functions performed more slowly) so probably best to NOT use this "feature".