Experiment
#3
Saving to a Cassette File
While
it
is quite convenient
to
save data
in
RAM, this can use up valuable memory
rather quickly. An alternative is to save
the
data file to cassette. Since the cassette
recorder uses removable cassette tapes, you have an essentially unlimited storage
capacity for your files. The disadvantage
of
using cassette data files is that you have
to be sure the recorder
is
properly attached and the tape
is
correctly positioned for
both writing and reading.
Attach your cassette recorder to the computer (consult the Owner's Manual if you
have any questions). Insert a blank tape in the recorder and rewind it. Advance the
tape past any leader using the fast forward key.
Load program EXPI using the command:
LOAD"EXP1"
(ENTER)
Change Line 110
to:
110
OPEN
"CAS:NAMES"
FOR
OUTPUT
AS
1
List the program to confirm that it
is:
100
CLS
110
OPEN
"CAS:NAMES"
FOR
OUTPUT
AS
1
120
INPUT
"NAME";
N$
130
IF
N$
=
""
GOTo
200
1£10
PRINT
#1
t
N$
150
N$
=
""
:
GO
TO
120
This is the same program used in Experiment 1 to write a RAM file, except that the
device in the OPEN statement in LINE 110 has been changed to
"CAS:".
Press the RECORD and PLAY keys on the cassette recorder together. Execute the
program and enter the following names when prompted
to
do so:
NAME?
Joan
Smith
NAME?
Patty
Wolf
NAME?
Allison
T.
Cornpone
NAME?
Jill
Shoe
NAME?
SallY
Ma~net
NAME?
Roxanne
o/ShacK
NAME?
Note that the cassette recorder will run for a
few
seconds and then stop before you are
able to enter any names. Press
(ENTER)
without entering any name
to
terminate
execution. After the last name is entered, the cassette recorder will run for a few
seconds and then stop.
At this point, the data file
"NAMES"
has been written on the cassette tape. To verify
this, you will have
to
proceed to the next experiment.
126
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