Sequential prophet 5 - Section 4 Cassette Interface; Introduction; Function

SECTION 4
CASSETTE
INTERFACE
4-0 INTRODUCTION
The
Prophet-5
cassette
interface
enables the permanent
storage
of
any
'fO-program
file,
or
any
eight-program
bank, on common audio tape. This
allows
you
to
retain
an
unlimited
number of
Prophet
programs,
and provides program
protection
(backup)
from
component
failure
or damage.
Also, you
can immediately personalize
another
Prophet
for your
own use,
since
reprogramming
takes less than
a
minute.
The
three
'fO-program
files
which constitute
the factory programs
are included on
cassette
with
each
Prophet-5.
Naturally, the
Program File which
is
saved
to or loaded from
tape will be
the
current
Program
File
as
indicated
by
the
decimals in the numeric
display. That
is,
if you
are
in
Program File
2
when doing
the
SAVE,
file 2 will be saved.
By the
same token,
loaded
programs will occupy the
Program
File
selected as the LOAD
is executed.
Since individual banks can be
saved and loaded into
any bank
location, it
is simple,
for
example, to create a new 'tO-program
file from as many
as five
separate bank
files.
This would
be
done by first loading
each complete file
into
the
Prophet
and
separately
saving the
desired
banks. Then
the five individual
bank
files would
be
loaded
into
the
Prophet. Finally,
this group would be
stored as
a complete
*0-program
file.
4-1
FUNCTION
The
general function of the
interface is
as follows. First,
the
Prophet's
back
panel
RECORD
switch is set to DISABLE,
to protect
the program
memory
contents.
After
a
few switch operations
(actual
operation
instructions
are
below)
a series
of
"sync"
pulses appears
at the
CASSETTE
OUT jack on
the Prophet
back
panel.
The
recorder
is
placed
in record mode. After 20
seconds—allowing
the
tape leader
time
to pass
and the
tape
speed
to stabilize—programs
are sent (written)
to
the recorder.
This
takes
about
30
seconds. When
done, an LED indicator
blinks.
To
insure
that
the data has been correctly
recorded,
the procedure
includes
a
verification
test.
The recording is played
back
into the
Prophet,
where
the
computer
checks
for
a byte-by-byte
match with the
contents of
the program
memory.
To
reprogram
the Prophet
by loading
a
file
or bank
from
tape, first
the back
panel
record
switch
is
set to ENABLE.
The recorder
plays
back the
data,
which replaces
the
existing
contents
of the program
memory.
(If you
were to
monitor this tape,
you would
first
hear
a
steady
tone, which are
the
sync pulses,
followed
by erratic "bleeps"—the
data
itself).
Loading
concludes
with
a comparison
of
the new contents of
the
program
memory
with the
recorded
data.
CMIOOOD
2/82
/f-1