Steren CAL-150 Instructivo De Uso página 223

Observe the following charts. If the letter P is followed by a
digit (0-9), this indicates that there are no programs stored
in memory slots P0 to P9. The blinking 0 indicates that the
current memory is P0.
Blank spaces indicate that these memory slots are being
used.
This is the procedure for storing the previous program in
memory slot P0.
After these operations have been completed, the program
will be stored in the memory.