1
.2
Engineering Drawing References
Engineering drawings wi
II
be
referenced
using
an
abbreviated
code.
As
an
example,
drawing
D-BS-DM09-A-2,
DMA
Adapter
Multiplexer
Control,
sheet
1
of
2,
wi
II
be
referenced
as
[DM-2(2)] •
2.
SPECIFICATIONS
2.1
Environmental
The DM09A consists
entire
Iy
of
modu les
of
the
type used in
the
PDP-9
centra
I processor.
Therefore,
PDP-9 environmentaI specifications
apply
to
the
DM09A.
2.2
Power Requirements
The option obtains a
II
necessary
operating
power from
the
PDP-9 power supply system.
No
additional
power
supplies,
power control
or
fan assemblies
are
necessary.
2.3
PhysicaI
The DM09A consists
entirely
of
modules which
are
housed by two
DEC
standard 1943 mount-
ing
panels,
thus requiring
10-1/2
in.
of
mounting
space.
Placement of these panels
is
given
in
Sec-
tion
3,
INSTALLATION.
2.4
Controls
and
Indicators
No
controls
or
indicators
are
associated
with
the
DM09A. The option
is
entirely
under
the
control
of
the
PDP-9
and
the
I/O
devices.
2.5
PeITormance
The multiplexer
operates
at
two
speeds.
I/O
devices
with 10
mHz
logic may request
the
high
speed
and
thus
achieve
a 1 iJS/transfer
rate;
I/O
devices
with low speed logic should request
the
low speed of 3 iJS/transfer
to
permit
sufficient
data-line
settling
time.
It should
be
remembered
that
the
speed range
applies
only
to
the
DM09A. The PDP-9
DMA
channel
and
the
memory require
only
1 iJS/transfer.
2
