(12C) Does a STO pop the stack or not?

[Didier Lachieze]

As a side note, you don't need to use STO to store to the financial registers: 123 [FV] will store 123 in the FV register.

On the original 12C, pressing [FV] to store a number in the FV register doesn't enable stack lift, so when you follow by entering 0 it just replaces the value in the X register.

This is documented in a footnote in the Appendix A of the 12C manual:

Quote:* In addition, the stack does not lift when a number is entered if the last operation performed was storing a number into a financial register. For example, the stack will not lift when a number is entered following the sequence 100000 [PV], but will lift when a number is entered following the sequence 100000[PV][FV].

I don't know why it is different on the Platinum. Maybe because the firmware is different and this peculiar feature has not been reproduced.