HP HP-25 - Page 98

If you key in data after the program has stopped running,
remember that resuming program execution does not terminate
digit entry. Thus, the calculator will assume that the digits in
the program are part of the number you have just keyed in un-
less you press after you key in the data and before you
resume running the program, or there is an in the
program immediately after the [r/s]instruction.
Changing One Instruction
Changing or correcting one step of your program is easy with
your HP-25 calculator because of the features built into it. Once
the error has been found, use [ or (5@ in PRGM mode or
in RUN mode to display the step preceding the step to be
changed. For example, to change the instruction in step 06, you
need to display step 05. If you wish to change the step, simply
press the correct key or keys for step 06. They will write over
and replace the incorrect information already stored in that step.
If step 06 is an extra step in your program, press ] [NOP] (no
operation). This instruction tells the calculator not to perform
any operation here.
Example Program. The program represented below is de-
signed to take the cube root of a number.
Press Display
a
o
Suppose that upon reviewing the program with the @ key,
however, you discover you have keyed in the following mis-
take-ridden program :
Press Display
01 31
02 03
Bl [~ 03 15 21 Oops! You pressed the wrong
key.
04 21 And you pressed it again by
mistake.
H
=
05 -
N
o W