Interrupting Program Execution - HP -25 Owner's Handbook Manual

Displaying a Particular Step
If you want to see one of the latersteps of your program, B3 is
not convenient. To display a particular step of program memory
use the key with the PRGM-RUN switch set to RUN
ercw [l ~ox . Simply press and then key in the desired two-
digit step number. Then set the PRGM-RUN switch to PRGM
ercv [[[H@~~ and the contents of the specified step will be
displayed.
For example, to see step 10 in the previous program, set the
PRGM-RUN switch to RUN esev Jll[TM »»~» and press (1][o].
Then switch back to PRGM mode rov [[[[HlMl~~. The display
will show:
10 06
When using the [ key in this way,always use two digits for
designating step numbers. For instance, to see step 6 you must
press [o][6]in RUN mode and thenswitch back to PRGM
mode.
If the first digit key following [ is greater than four, the [E8)
key is ignored and the number is keyed into the X-register.
Similarly,if one of the two keys following [ is not a digit key,
the @@ key is ignored and the operation associated with the
invalid key is performed.
Interrupting Program Execution
From time to time you will want a program to stop execution
by itself so that you can enter new data or view an intermediate
result. There are two operations on your HP-25 calculator that
will automatically interrupt program execution when they are
encountered as program instructions: [Ris]and {7 [Pause .