Clearing The Stack - HP -25 Owner's Handbook Manual

to review the contents of the stack at any time so that you can
always tell what is in the calculator. Always remember, though,
thatit takes four presses of the [ key to return the contents to
their original registers.
Exchanging Xand Y
The B (x exchange y) key exchanges the contents of the X-
and Y-registers without affecting the Z- and T-registers. If you
press with data intact from the previous example, the num-
bers in the X- and Y-registers will be changed . . .
fllo_"LtB_'S_ . . . to this.
T 400| T | 4.00
Z 300 Z 3.00
Y 200 Y 1.00
X 1.00 X 200
Similarly, pressing ¥ again will restore the numbers in the
X- z}r}d Y-registers to their original places. This key is used to
position numbers in the stack or simply to view the Y-register.
Clearing the Stack
To clear the displayed X-register only, press [EE§. To clear the
entire automatic memory stack, including the displayed X-
register, press{{i| [STc](clear stack). This replaces all numbers
in the stack with zeros. When you turn the calculator OFF, then
ON, it "*wakes up'' with all zeros in the stack registers.
Although it may be comforting, it is never necessary to clear the
stack or t/}e displayed X-register when starting a new calcu-
lation. This will become obvious when you see how old results
in the stack are automatically lifted by new entries.