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Fu~c~o~
Keys
55
Storage Registers
In
addition
to
automatic storage of inte rmediate
results that is
provided by the four-register
automatic
memory
stack
,
the
HP-25
a lso
has
eight
addressable
storage registers
that
are
un-
affected by operations within
the
stack. These storage
registers
a llow you
to
set aside
numbers
as constants or fo
r
use in
later
calculations
,
a nd
they
can be
used
e ither
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,
T he addresses of
the
storage
registers
are ind icated
by number
keys@]through[IJ,
as shown above.
Storing and Recalling Data
To
store a value appeari ng
in
the
display
,
press
m
(store)
followed by
a
number key
(@]
through[IJ)
specifying the
regis-
ter
address w here
the value is to be
stored. For example
,
to
store Avogadro
'
s
number
(approx imately 6.02
X
10
2 :
3
)
in
register R
2 :
Press
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
copied
into the storage
register
,
so 6.02
x 1023
also remains
in the
disp layed X-register.
To copy
a
number
from one of the storage
registers into
the
display
,
press the
liD
(reca ll)
key
fo llowed
by the number
key
of
the register
address.
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