Commodore PET User Manual page 258

- - - Print N on screen
- - - Print N on data file #1 (NUMBERS)
This OPEN command opens 10gÎcai file #i, physical devÎce #1 (the cassette tape
unit). secondary address 2 (OPEN for write and EOT mark at close of file). assign-
ing the new data file the name NUMBERS.
10
Next. we set up a FOR ... NEXT loop ta print the numbers 1 through
~O
on
the screen and on the data tape:
50
FOR N=l TO
10
·60 PRINT N
70
PRIHT#l,N
80
NEXT N
Printing to the sereen and to the tape require separate eommands.
PRINT#1 ,N will print only ta the tape. Remember that PRINT# cannat be typed in
as
?
#. PRINT must be spelled out completely, with the number sign, file number,
comma, and variable following respectively.
Incorrect
?#l,N
PRINT N
PRINT #l,N
PRINT#lN
PRINTl, N
Correct
PRINT#l,N
Any of the above incorrect methods will result in a syntax error, except
PRINT N, which will print ta the screen but not ta the tape.
If everything works correctly, lines
50
through
80
write ta the tape and
screen:
PET screen
1
2
.-,
,;:0
4
5
6
7
8
9
10
<CR
>=
carriage return
Representation of Data Tape
Because data cannat be written on separate "vertical lines" on a tape, car-
riage returns are automatically inserted on the tape in relation ta the carriage
returns on the screen.
After ail data is written ta the tape, the file is closed. Ta ensure that ail the
data is written ta the tape vou must CLOSE the file.
90
PRINT" •• CLOSINO DATA FILE ••":CLOSEl
100
END
245