User`s manual
2.3.1 Unibus Cable Interconnections
The
DV II
is
shipped with
one
M920
Unibus
Con-
nector (placed in slot 9 as shown in the module utili-
zation program, Figure 2-2), which provides for
electrically connecting
the
unit
to
the
PDP-II
Unibus.
For
processor box installation where
the
unit
is
to
be electrically placed in mid-bus (i.e., somewhere
between
the
first
and
last devices
on
the
PDP-II
Unibus), the M920 from
the
next higher device
(closer to the processor)
on
the
bus is plugged
into
slot I
of
the
DVII,
and
the M920 in slot 9
of
the
DVII
is
plugged into slot I
of
the
next lower device
on
the
bus.
For
an end-of-bus installation
of
the
DVII,
proceed
as follows:
I. Remove the
M930
Unibus
Terminator
from the last slot
of
the
current
end-of-bus
device.
2.
Remove the M920 from slot 9
of
the
DVII
and place in slot I
of
the
DVII.
3.
Install
the
M930 (removed in step I) in
slot 9
of
the
DVll.
Unibus interconnections are
made
via
BCII-A
cables
where the DV
II
is
installed in
expander
box
or
is
physically the first
or
last unit in any box.
Cable
requirements in these cases
are
as described in Figure
2-2.
2.4
MODULE
INSTALLATION
AND
CUSTOMIZING
Figure 2-2
is
the
module utilization diagram. Set
the
address assignment
and
parameter
selection switches
as described in
Paragraphs
2.4.1
and
2.4.2 before
installing modules.
2.4.1
Unibus
and
Interrupt
Vector
Address
Assignments
The
Unibus
and
interrupt
vector addresses
for
the
DV
II
must be set manually before operating
the
2-5
DVII.
Two
Unibus addresses (also called device
addresses)
and
two
interrupt
vector addresses
are
provided on
the
D V
II
as follows:
1.
DVII
Data
Handling
Section address,
2.
DVII
~fCU
address,
3.
DV i i
Data
Handiing Section
interrupt
vector address,
4.
DVII
MCU
interrupt
vector address.
Because
the
DV
II
has ten registers directly address-
able by the
PDP-II
program, it must be assigned a
Unibus address
that
is
a mUltiple
of
32
(octal 40). All
DV
II
s in a
system
should
have
consecutive
addresses.
The
Unibus
addresses for
the
DVII
Data
Section
are
controlled by a rocker
DIP
switch package, located
on
module M7836,
and
by
jumper
straps
on
module
M7807 for the
DVII
MCU.
(Locations
of
all address
selection switches
and
jumpers
are shown in Figures
2-3
through
2-5.)
The
position
of
these switches deter-
mines bits 03-12
of
the
Unibus
address.
If
a
rocker
switch
is
set
to
ON
or
a
jumper
on
the M7807
board
is
in, an
address
bit
of
zero in the corresponding
bit
position serves
to
address
the
DVII
Data
Handling
Section.
DEC
standard
software requires
that
the
DVII
address
be
set as specified in
Paragraph
2.1.4.
Switch settings for device address selection
are
shown
in Table 2-2.
The
interrupt
vector address for
the
Data
Handling
Section
is
controlled by a
DIP
switch package
on
the
M7837 module, which selects vector address bits
08-03.
The
switches
should
be set
to
select
vector
addresses between 300
and
776. Switch settings
for
interrupt
vector address selection for
the
Data
Han-
dling Section
are
shown
in
Table
2-3. Vector address
selection for
the
Modem
Control
Unit
is
done
by
jumpers
on
the
M7807
module
(Table 2-4).