Automatic Memory Allocation; Converting Storage Registers To Program Memory - HP -34C Owner's Handbook Manual

Simple Programming 55
If you try to execute a label ((LBL)) that is not contained as an instruction
in program memory, the HP-34C will display Error 4. For example, if
your calculator contains only the program for area ofa circle that you just
keyed in, you can cause an Error 4 condition by simply pressing a letter
key.
Keystrokes Display
Error 4
To clear the error message from the display, press (CLx]or any other key.
The calculator remains set at the current line of program memory.
Automatic Memory Allocation
Converting Storage Registers to Program Memory
The automatic memory allocation designed into your HP-34C gives you
increased versatility by converting storage registersto lines of program
memory only as needed. You begin programming with 70 lines of pro-
gram memory and 20 storage registers (plus the I-register, described in
section 7). With 0 to 70 instructions in program memory, the allocation
looks like this:
STORAGE REGISTERS PROGRAM MEMORY
Permanent Shared Shared Permanent
000-
001-
002-
7./
=
068-
069-
070-
Shared
-none-