Section
3
The Automatic Memory Stack
The Stack
Automatic storage
of
intermediate results
is
the reason
that
the
HP-25 slides so easily through the most complex equations.
And automatic storage
is
made possible by the Hewlett-Packard
automatic memory
stack
.
Initial Display
When you first switch the calculator
ON
, the display shows
1 0.
00
I.
This
represents the contents
of
the display,
or
X-
register.
Basically, numbers are stored and manipulated
in
the machine
"registers."
Each
number, no
matter
how few digits (e.g., 0,
1,
or
5)
or
how many (e.g., 3.141592654, -
23
.28362,
or
2.87148907
x
\0
27
),
occupies
one
entire register.
The
displayed X-register, which
is
the only visible register,
is
one
of
four registers inside the calculator that are positioned to
form the automatic memory
stack
. We label these registers X,
Y,
Z, and
T.
They
are"
stacked"
one
on top
of
the
other
with
the displayed X-register on the bottom. When the calculator
is
switched
ON,
these four registers are cleared to 0.00.
Name
Register
T
0.00
Z
0.00
Y
0.00
X
0.00
Always displayed.
Manipulating Stack Contents
The m (roll down) and
l!'D(x
exchange
y)
keys allow you to
review the
stack
contents
or
to shift
data
within the stack for
computation
at
any time.
35
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