Commodore CBM - List

Format:
CONT
A break
is an interruption in program execution that returns control to PET
BASIC before the program has executed ta completion. A scheduled break is
caused by execution of a STOP statement. execution of an END statement that
has additional statements following it. or depressing the STOP key while the pro-
gram
is running.
During a program break vou can LIST. LOAD. SAVE.
VERIFY. and perform
any immediate mode operations using
PET BASIC statements - including
changing the values of program variables - and still continue program execution
by issuing a subsequent CONT command typed in
at the keyboard. This can be
very useful in debugging situations. On resumption of the program. execution
continues at the exact point where it left off. A break caused by pressing the
RETURN key in response ta an INPUT statement can be recovered by typing
CONT. In this case the same INPUT request is repeated.
Vou cannot resume pragram execution using
CO NT if during the program
break vou make any editing changes to the program or issue a
CLR or NEW. CONT
cannat continue program execution past
an error message.
Example:
CONT
LIST
The List Program commando LIST. displays one or more lines of a program.
Vou may edit program lines displayed by the LIST commando
Format:
!
(blank)
line
LIST
linel-line2
-line
line-
where:
List entire program.
List one line.
List from linel to line2'
List fram start to line.
List from line ta end.
line
is a line number. Linel is a lower number than
line2·
Ail line numbers are inclusive. The line
numbers do not need ta
be actual line numbers
in the program. In the case of listing one non-
existent line. a blank line
is printed.
LIST
is the most common command vou will give in PET BASIC. It lists pra-
gram lines
on the display screen for examination and possibly subsequent editing.
After a LIST commando vou can move the cursor up to any line in the pragram
shawn
on the screenand make editing changes.
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