Sequential prophet 5 - Introduction

SECTION
6
SYSTEM
INTERFACE
PROGRAMMING
6-0
INTRODUCTION
The
Prophet-5
system
interface
is
specifically
designed
for
the
Model
1005
Polyphonic
Sequencer,
Model
1001
Remote
Keyboard
and
other
forthcoming
accesories.
The
programming
specifications
below
will enable
experienced
technicians
and
program-
mers
to design
their
own
sequencers
and
accessories.
Many
of the
popular
microcom-
puters
can now
be
interfaced
to
the Prophet-5.
CAUTION:
Since
we have
no
idea
what
you will
be
connecting
to
the
DIGITAL
or
ANALOG
inputs,
we
cannot
guarantee
this
interface
will
work
with
any
custom
device.
You
are
completely
responsible
for any
damage
to
the
Prophet
which
may
result
from
use
with
non-SCI
products.
You
should
be most
concerned
with
hardware
connections.
Interface
hardware
and
signal
specifications
are
given
in
paragraphs
S-'f
and
3-5.
Actually,
you
can't
"hurt" the
Prophet
by
faulty
programming.
The
Prophet's
operating
system
is in ROM
and
remains
unaltered,
no
matter
what
codes are
sent
to
the
Prophet.
At
worst
you
will
jumble
or
erase
the Non
Volatile
(NV)
Program
RAM
area
which
stores
the
current
40-program
file. But
the
file is
easily
reloaded
through
the
cassette
interface.
All
the
information
required
to
program
the
interface
is below.
But
some
will
no
doubt
also
wish
to
purchase
the
Prophet-5
Technical
Manual
(TM1000D.3),
which
may
be
ordered
through
the
Customer
Service
Department.
This
is
a
high-speed
serial
interface.
The
Prophet
uses
a
SIGNETICS
2651
or 2661
Programmable
Communications
Interface,
which
is
essentially
a
microcomputer-
oriented
US
ART
(Universal
Synchronous/Asynchronous
Receiver-Transmitter).
It
can
be
clocked
to
1
MHz.
Not
all
USARTs
will
operate
at
the
speeds
required,
so
choose
carefully.
USARTs
are
probably
the
easiest to
use,
but
other
techniques
are
possible.
A
cleverly
-programmed
microprocessor
could drive
the
interface
directly,
as
could
discrete
logic.
CMIOOOD
2/82
6_1