CASSETTE TAPE CONTROLS
The cassette tape control keys are located at the forefront of the cassette
drive.
Record (REel. The
RECORD
key lets vou
write
onto the magnetic tape
cassette from
PET
memory. To record, vou
must
execute a SAVE command
(which
is
described
in
Chapter
41.
then hold
down
the
REC
key
while
depressing
the PLAY
key.
Rewind (REW). The REWIND key rewinds the magnetic tape at high speed,
to its beginning. To rewind the tape. depress the REWIND
key.
If the tape does not
start moving, press the tape
STOP
key,
and then press REWIND.
Vou
will
use REWIND often to rewind tape cassettes back to their beginning
point
before removing them from the tape drive. Vou
will
also use REWIND any
time vou need the
PET
to start searching for information beginning at
an
earlier
point
on the magnetic tape.
Fast Forward (FFWO). FAST FORWARD
winds
the magnetic tape forward
at high speed. Vou
will
not normally use FAST FORWARD.
The
PET
writes
onto magnetic tape. reads fram the tape. and searches for in-
formation on the tape ail at PLAY speed,
which
is
slow.
Vou may devise your
own
scheme using Fast Forward to locate information.
rather than have the
PET
search at its Play speed. One method
is
just
to
guess.
Fast Forward
to
a
point
that
Vou
think
is
close to the beginning of the information
vou
want
to load and then try to load. Note
that
vou can
be
anywhere on the tape
when
vou give the
PET
a LOAD request; vou do
not
have
to
be
at the beginning of
a program or at the beginning of the tape. A more scientific method
is
to
use the
measuring scale on the tape cassette: the one below goes from 0
to
100 in units
of 10.
with
the beginning of the tape at 30:
• •
/
~
SOME
COMMON
BASIC
PROGRAMS
,.-~
~"')'I~
OSBORNElMcGRAW-HILL
630
BANCROFT
WAY.
BERKELEY,
CA
94710
l.
•
•
1
..,
As the tape moves forward, the tape radius. measured on the scale. goes
fram 30 up to 100. 100
is
the end of the tape. Sy keeping a record of information
stored on a tape. using the radius numbers. vou can Fast Forward
to
a
point
just
before the desired location.
36
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