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42
Section 3: The Memory Stack, LAST X, and Data Storage
Keystrokes
*
*
*
*
Storage Register Operations
When numbers are stored or recalled, they are copied between the display
(X-register) and the data storage registers. At ―power-up‖ (initial turn-on or
Continuous Memory reset) the HP-15C has 21 directly accessible storage
registers: R
through R
0
diagram of the registers on the inside back cover). Six registers, R
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,
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.
Display
1,150.0000
1,322.5000
1,520.8750
1,749.0063
, R
through R
9
.0
Population at the end of day 1.
Day 2.
Day 3.
Day 4.
, and the Index register (R
.9
*
this function exchanges the
) (see the
I
to R
,
2
7
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