HP 15C User Manual download pdf (Page 215)

Appendix C: Memory Allocation 215

Memory Status (W)

To view the current memory configuration of the calculator, press |

W (memory), holding W to retain the display.

The display will be

four numbers,

dd uu pp-b

where:

dd = the number of the highest-numbered register in the data storage

pool (making the total number of data registers dd + 2 because of R

and R

);

uu = the number of uncommitted registers in the common pool;

pp = the number of registers containing program instructions; and

b = the number of bytes left before uu is decremented (to supply seven

more bytes of program memory) and pp is incremented.

The initial status of the HP-15C at power-up is:

19 46 0-0

The movable boundary between the data storage and common pools is

always between R

and R

dd + 1

Memory Reallocation

There are 67 registers in memory, worth seven bytes each. Sixty-four of

these registers (R

to R

) are interconvertible between the data storage and

common pools.

The m % Function

If you should require more common space (as for programming) or more

data storage space (but not both simultaneously!), you can make the

necessary register reallocation using m %.

†

The procedure is:

MEM is nonprogrammable.



m (dimension) is so called because it is also used (with A through E or V) to dimension

matrices. Above, however, it is used (with %

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HP 15C User Manual Page 215