Storage Register Operations
When numbers are stored or recalled, they are copied between the display
(X---on or
Continuous Memory reset) the HP-15C has 21 directly accessible storage
registers: R
0
through R
9
, R
.0
through R
.9
, and the Index register (R
I
) (see the
diagram of the registers on the inside back cover). Six registers, R
2
to R
7
,
are also used for statistics calculations.
The number of available data storage registers can be increased or
decreased. The m function, which is used to reallocate registers in
calculator memory, is discussed in appendix C, Memory Allocation. The
lowest-numbered registers are the last to be deallocated from data storage,
therefore it is wisest to store data in the lowest-numbered registers
available.
Storing and Recalling Numbers
O (store). When followed by a storage register address (0 through 9 or
.0 through .9*), this function copies a number from the display (X-register)
into the specified data storage register. It will replace any existing contents
of that register.
l (recall). Similarly, you can recall data from a particular register into
the display by pressing l followed by the register address. This brings
a copy of the desired data into the display; the contents of the storage
register remain unaltered.
X (X exchange). Followed by 0 through .9,
*
this function exchanges the
contents of the X-register and the addressed data storage register. This is
useful to view storage registers without disturbing the stack.
*
All storage register operations can also be performed with the Index register (using V or %), which is
covered in section 10, and with matrices, section 12.
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