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HP 25 User Manual

HP 25
132 pages
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The Automatic Memory Stack 39
As
you
can
see,
the
number
in
the
displayed
X-register
is
copied
into
Y.
(The
numbers
in Y
and
Z
have
also
been
transferred
to
Z
and
T,
respectively
,
and
the
number
in
T
has
been
lost
off
the
top
of
the
stack.
But
this will
be
more
apparent
when
we
have
different
numbers
in all
four
registers.)
Immediately
after
pressing
mum
,
the
X-regis
ter
is
prepared
for
a
new
number
,
and
that
new
number
writes
over
the
number
in
X.
For
example
,
key
in
the
number
543.28
and
the
contents
of
the
stack
registers
change
...
·
..
from this
...
.
..
to this.
T
0.00
T
0.00
Z
0.00
Z
0.00
V
314.32
V
314.32
X
314
.
32
Display
X
543
.
28
Display
rD3
replaces
any
number
in
the
display
with
zero.
Any
new
number
then
writes
over
the
zero
in X.
For
example
, if
you
had
meant
to
key
in 689.4
instead
of543
.28,
you
would
pressrD3
now
to
change
the
stack
.
..
·
..
from this
...
.
..
to this.
T
0.00
T
0.00
Z
0.00
Z
0.00
V
314.32
V
314.32
X
543
.
28
Display
X
0.00
Display
and
then
key
in
689.4 to
change
the
stack
...
·
..
from this
...
.
..
to this.
T
0.00
T
0.00
Z
0.00
Z
0.00
V
314.32
V
314.32
X
0.00
Display
X
689.4
Display
Notice
that
numbers
in
the
stack
do
not
move
when
a
number
is
keyed
in
immediately
after
pressing
mum
or
rD3.
(How-
ever,
the
numbers
in
the
stack
do
lift
when
a
new
number
is
keyed
in
immediately
after
pressing
m .)

Table of Contents

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HP 25 Specifications

General IconGeneral
Power SourceRechargeable battery pack
Programming Steps49
Release Year1975
FunctionsTrigonometric, logarithmic, statistical
TypeScientific
Dimensions148 x 80 x 14 mm

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