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2. Press
I
PAUSE
I
(~
on an ITF keyboard). The printout of numbers stops, and
all the data on the CRT remains unchanged. The run light now indicates that the
program is paused and can be continued. The program line that appears at the
bottom of the CRT is the next line that will be executed when program execution
resumes.
User 1
Caps
Paused
I---"Program-Status" Indicator
---"Run Lighf
3. Press
I
STEP
I
([IT] on an ITF keyboard) a few times. The program is executed one
line at a time, as indicated by the lines changing at the bottom of the CRT. Notice
that the program is still paused and continuable after each press of the
I
STEP
I
key.
The
I
STEP
I
key can be a great help when you are trying to find certain kinds of
problems. The "Debugging Programs" chapter of BASIC Programming Techniques
gives the details of this and other debugging tools.
System
Caps
Paused
- - - "Program-Status" Indicator
~ ~;
_ _ _ uRun Light"
--------------
4. Press
I
CONTINUE
I
(@] on an ITF keyboard). The printout on the CRT resumes with
the next number in the sequence. The run light again indicates that a program is
running.
System
Caps
Running
1---
"Program-Status" Indicator
, - - - "Run Light"
4-10
Loading and Running Programs
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