DMAF2
Floppy
Disk
Unit
Introduction
___,
The
Southwest
Technical
Products
Corporation
DMAF2 is
a
dual
drive,
Single
and
double
density,
double
sided
eight-inch
disk
unit.
The
DMAF2
is
designed
to
operate
with
the
SWTPC
SS-50
bus
computer
systems.
Although
the
DMAF2
jis
designed
to
operate
with
two
drives,
up
to
four
drives
may
be
used
with
a
special
daisy
chained
interconnection
cable.
Although
the
DMAF2 Disk
Unit
was
completely
assembled
and
tested
at
the
factory,
slight
reprogramming
of
the
circuit
board
may
be
necessary
to
operate
with
your
particular
computer
system.
Also,
the
disk
drives
may
need
to
be
installed
in
the
chassis.
It
is
suggested
that
this
instruction
manual
be
read
completely
before
attempting
to
use
the
system.
Step-by-step
instructions
are
given
for
configuring
the
unit
for
your
particular
system
to
minimize
the
possiblity
of
errors.
Disk
Drive
Installation
The
two
disk
drives
for
the
DMAF2
were
probably
shipped
in
their
original
containers
rather
than
being
attached
to
the
chassis.
Carefully
remove
each
drive
from
its
shipping
container.
One
drive
should
be
clearly
marked
with
a
0
and
the
other
with
a
1.
The
drive
marked
0
should
be
installed
in
the
chassis
so
that
it
is
the
left
drive
(as
viewed
from
the
front).
Before
attaching
drive
0
to
the
chassis,
install
the
50-pin
ribbon
cable
connector
to
its
mate
on
the
drive
as
shown
in
the
DMAF2
wiring
pictorial.
Be
sure
the
connector
is
installed
so
that
the
side
of
the
cable
with
the
colored
band
is
facing
toward
the
drive
motor
as
shown
in
the
pictorial.
The
drive
marked
1
should
have
an
extra
wire
with
a
connector
on
the
end
attached
to
the
bottom
circuit
board
of
the
drive.
When
installing
this
drive
be
sure
the
wire
and
connector
extends
out
from
the
back
of
the
drive
so
that
it
may
be
connected
to
its
proper
mate
on
the
motor
control
board.
Both
drives
should
be
securely
fastened
to
the
chassis
using
the
#8
-
32
screws
supplied.
Once
the
drives
have
been
fastened
to
the
chassis
the
power
and
control
cables
should
be
installed.
Although
all
connectors
are
indexed
and
can
only
be
installed
one
way,
the
step-by-step
procedure
should
be
followed
to
avoid
any
errors.
The
wiring
pictorial
should
be
used
to
aid
in
connecting
the
cables.
(
)
Be
sure
that
the
DMAF2 is
not
connected
to
the
power
line.
(
)
Connect
the
longer
of
the
two
AC
cables
from
the
motor
control
board
to
its
respective
socket
on
drive
0.
Be
sure
the
connector
seats
firmly
in
the
socket.
(
)
Connect
the
other
AC
cable
to
its
socket
on
drive
1.
(
)
Connect
the
longer
DC
cable
to
its
respective
socket
on
drive
1.
-1-