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HP 25 User Manual

HP 25
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Fu~c~o~
Keys 55
Storage Registers
In
addition to
automatic
st
orage
of
interm
ediate
results
that
is
provided by
the
four-register
automa
tic
memory
stack
, the
HP-25 also has eig
ht
addressable
storage
registers
that
are un-
affected by
operations
within
the
stack.
These
storage
registers
a
ll
ow
you to
set
aside
numbers
as
constants
or
fo
r use
in
l
ater
ca
l
cu
l
ations
, and
they
can
be used ei
ther
manually
or
as part
ofa
program.
Automatic Memory
Stack
I
LAST
X II
~
I
D;,pi,y
Storage Registers
I I Ro
I I R,
I I R2
I I R,
I I R,
I I R,
I I R,
I I R,
The
addresses
of
the
storage registers
are
indi
cated
by
number
keys@]through[IJ,
as
shown
above.
Storing and Recalling Data
To
store
a va
lu
e
appeari
ng
in
the display, press m
(store)
followed by a
number
key
(@]
through[IJ)
specifying the regis-
ter
address
wh
ere
the value
is
to be
stored.
For
examp
le, to
store
Avogadro
's
number
(approx
i
mately
6.
02
X
10
2
:
3
)
in
register R
2
:
Pre
ss
6.02
m:1
23
Em] 2
Display
I 6.02 23 I
I 6.0200000 23 I
The
number
is
now
stored
in
register R
2
When
a
number
is
stored
,
it
is
merely
copi
ed into the storage
register, so 6.
02
x
10
23
also remains
in
the
displ
ayed
X-register.
To
copy
a
number
from
one
of
the
storage
registers into the
display,
press
the
liD
(reca
ll
) key
fo
ll
owed
by the
number
key
of
the register
address.

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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