HP 25 User Manual

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.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm