To use RPN:
■
To enter RPN mode, choose View > RPN Mode.
The stack is shown in Calculator’s display, the equal (=) button becomes the Enter button, and four buttons appear that let you manipulate numbers on the stack.
■
To swap the bottom two numbers on the stack, click Exchange Registers. (It’s labeled “x <-> y.”)
■
To move the most recently entered number up and down the stack, click Roll Up and Roll Down. (They’re labeled R-Up Arrow and R-Down Arrow.)
■
To remove the bottom number from the stack, click Drop.