HP 15c - Manual (Page 76)

76 Section 6: Programming Basics
Memory is reallocated by telling the calculator which data storage register
shall be the highest data register; all other registers are left for programming
and advanced functions.
Keystrokes Display
60
´ m % * 60.0000
R
60
and below allocated to data
storage; five (R
61
to R
65
) remain
for programming.
* The optional omission of the ´ keystroke after another prefix key is explained on page 78, Abbreviated
Key Sequences.
Initial Memory Configuration