Storing Numbers; Recalling Numbers - HP -10C Owner's Handbook Manual

Section 2: Memory Stack, LAST X, and Data Storage 29

Storing Numbers

O (store). When followed by a storage register
address (0 through 9), this key copies a number from
the display (X-register) into the data storage register
specified by the address number.
If ...
and you press O0, then ...
A copy of the stored number remains in the storage register until a new number
is stored there or until the storage registers are cleared or Continuous Memory is
reset.

Recalling Numbers

l (recall). When followed by a storage register address (0 through 9), this
key places a copy of the number in the specified data storage register into the
display (X-register). If the stack is not disabled, executing a l operation
causes the stack to lift.