WP 34S Owner‘s Manual
Edition 2.2
Page 20 of 103
STACK MECHANICS
The following assumes you are familiar with RPN
– else please turn to the
HP-
42S Owner’s Manual
first.
The fate of particular stack register contents depends on the operation executed, its domain (real or complex) and the stack size cho-
sen. Real functions in a 4-level stack work as known for decades. In a larger stack, everything works alike on your WP 34S
– just with
more levels for intermediate results. Please note only the contents of
X
are displayed in any case. See below for details of the stack
mechanics:
Lev
el
Assumed
stack contents
at the begin-
ning:
Stack contents after
executing …
… real functions of
… the real stack register operations
… one
number
like
x
2
… two
numbers
like /
ENTER
FILL
DROP
x
y
R
R
LASTx
With
4
stack
levels
T
t
z
x
t
t
x
z
z
t
t
Z
z
y
x
t
z
t
y
y
z
t
Y
y
x
x
z
x
z
x
x
y
z
X
x
x
x
y
y
y
t
last x
x
2
y / x
With
8
stack
levels
D
d
c
x
d
d
x
c
c
d
d
C
c
b
x
d
c
d
b
b
c
d
B
b
a
x
c
b
c
a
a
b
c
A
a
t
x
b
a
b
t
t
a
b
T
t
z
x
a
t
a
z
z
t
a
Z
z
y
x
t
z
t
y
y
z
t
Y
y
x
x
z
x
z
x
x
y
z
X
x
x
x
y
y
y
d
last x
x
2
y / x
Calculating formulas from inside out stays a wise strategy in either stack. With more levels, however, stack overflow will hardly ever
happen, even with the most advanced formulas you compute in your life as a scientist or engineer.
