Storage Registers - HP -25 Owner's Handbook Manual

Storage Registers
In addition to automatic storage of intermediate results thatis
provided by the four-register automatic memory stack, the
HP-25 also has eight addressable storage registers that are un-
affected by operations within the stack. These storage registers
allow you to set aside numbers as constants or for use in later
calculations, and they can be used either manually or as part
of a program.
Automatic Memory Storage Registers
Stack R,
T R,
z
Y [ IR
X
Display
[ R
[LASTX|
The addresses of the storage registers are indicated by number
keys[o]through[7], as shown above.
Storing and Recalling Data
To store a value appearing in the display, press B8 (store)
followed by a number key ([0] through([7]) specifying the regis-
ter address where the value is to be stored. For example, to
store Avogadro's number (approximately 6.02 x 10?%) in
register R,:
Press Display
6.02E223 [6.02 23
2 6.0200000 23 The number is now stored in
register R,.
Wh.en a number is stored, it is merely copied into the storage
register, s0 6.02 x 102? also remains in the displayed X-register.
To copy a number from one of the storage registers into the
display, press the [{&8 (recall) key followed by the number key
of the register address.