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EK-BA11N-UG-001

January 1978

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Document:	BA11-N Mounting Box User's Guide
Order Number:	EK-BA11N-UG
Revision:	001
Pages:	49
Original Filename:	http://bitsavers.org/pdf/dec/qbus/EK-BA11N-UG-001_BA11-N_Mounting_Box_Users_Guide_Jan78.pdf

OCR Text

BA 11-N mounting box
user's guide

mamaDmo PDP 11J03-l

BA 11-N mounting box
user's guide

EK-BA 11 N-UG-001

digital equipment corporation. maynard, massachusetts

Ist Edition, January 1978

The material in this manual is for informational
purposes and is subject to change without notice.
Digital Equipment Corporation assumes no responsibility for any errors which may appear in this
manual.
Printed in U.s.A.

This document was set on DIGITAL's DECset-8000
computerized typesetting system.

The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:
DEC
DECCOMM
DECsystem-lO
DECSYSTEM-20

DECtape
DECUS
DIGITAL
MASSBUS

PDP
RSTS
TYPESET-B
TYPESET-1t
UNIBUS

CONTENTS
Page
CHAPTER 1

INTRODUCTION

1.1
1.2
1.3
1.4
1.5
1.6

GENERAL .......................................................................................................... 1-1
BAII-N APPLICATIONS ................................................................................... 1-4
LSI-II BACKPLANES ....................................................................................... 1-5
MODULE LOADING OF THE LSI-II BUS ...................................................... 1-8
SPECIFICATIONS ........................................................................................... 1-10
RELATED DOCUMENTS ............................................................................... 1-14

CHAPTER 2

UNPACKING, INSTALLATION, AND OPERATION

2.1
2.2
2.2.1
2.2.1.1
2.2.1.2
2.2.1.3
2.2.1.4
2.2.1.5
2.2.1.6
2.2.2
2.2.3
2.2.4
2.2.5
2.3

UNPACKING .................................................................................................... 2-1
INSTALLATION ................................................................................................ 2-1
Preliminary Checks ....................................................................................... 2-1
AC Voltage Selection ............................................................................ 2-1
Backplane Jumper Positions ................................................................. 2-1
Bezel Assembly Jumper Positions ......................................................... 2-4
Power Controller Cable Installation ..................................................... 2-4
Module Insertion and Removal ............................................................ 2-6
Module Installation .............................................................................. 2-6
Mounting the Logic Box Cover in an Equipment Rack ................................. 2-8
Installing the Logic Box Base in the Cover .................................................. 2-12
Power Connections ..................................................................................... 2-14
Installation Verification .............................................................................. 2-14
OPERATION .................................................................................................... 2-14

APPENDIX A

BACKPLANE AND MODULE CONFIGURATION

FIGURES
Figure No.
1-1
1-2
1-3
1-4
1-5
1-6

Title

Page

BA 11-N with Front Bezel ..................................................................................... 1~l
BA 11-N with Blank Front Panel ........................................................................... 1-2
BAII-N, Logic Box Cover Removed .................................................................... 1-3
BAII-N, Rear View ............................................................................................. 1-3
BAII-N System Applications ..................................................... ;........................... 1-4
H9270 Backplane Connectors ............................................................................... 1-5

iii

FIGURES (CONT)
Figure No.
1-7
1-8
1-9
1-10

1-11
1-12
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
A-I
A-2
A-3
A-4
A-5
A-6
A-7
A-8

Title

Page

Module Installation in the H9270 Backplane ......................................................... 1-6
H9273 Backplane Connectors ............................................................................... 1-7
Module Installation in the H9273 Backplane ....................................................... .1-8
AC Loading Violation .......................................................................................... 1-9
Power Up/Power Down Timing ......................................................................... 1-12
H786 Power Supply Minimum Ride-Through After Power Interruption ............. 1-13
BA11-N Voltage Select Switch .............................................................................. 2-2
Backplane Jumpers ............... : .............................................................................. 2-3
Bezel Printed Circuit Board .................................................................................. 2-5
Insertion and Removal of Modules Having Extractor-Type Handles .................... 2-7
BAII-N Cover Mounting Dimensions .................................................................. 2-8
BA 11-N Unit Assembly Drawing ......................................................................... 2-9
Power Connections, PDP-II /03L Systems .......................................................... 2-15
Power Connections with BA 11-M Expander Boxes ............................................. 2-16
Front Panel Switches and Indicators ................................................................... 2-16
Backplane Selector Chart, PDP-11/03 Expansion ................................................ A-3
Backplane Selector Chart, PDP-11/03L Expansion ............................................. A-3
Configuration Chart, PDP-II /03L (H9273) ........................................................ A-4
Configuration Chart, PDP-l1/03L (H9273) and BA11-N (H9273) ....................... A-5
Configuration Chart, PDP-11/03L (H9273) and (2) BA11-N (H9273) .................. A-7
Configuration Chart, PDP-ll/03 (H9270) ........................................................... A-9
Configuration Chart, PDP-11/03 (H9270) and BA11-N (H9273) ....................... A-1O
Configuration Chart, PDP-11/03 (H9270) and (2) BAII-N (H9273) .................. A-11

TABLES
Table No.
1-1
1-2
2-1
2-2
2-3
2-4
2-5
A-I

Title

Page

BAI1-N Specifications ....................................................................................... 1-10
BAI1-N Power Supply Specification ................................................................... 1-1 1
Backplane Jumpers .............................................................................................. 2-4
Bezel Assembly Jumpers ....................................................................................... 2-5
Parts List ............................................................................................................ 2-11
LSI-II Bus Expansion Cable Assemblies ............................................................ 2-13
BA 11-N Front Panel Switches and Indicators ..................................................... 2-17
Option Summary Chart ..................................................................................... A-13

CHAPTER 1
INTRODUCTION

The
11-N Mo unting Box can be installed in a standard 48.3 em (19 in) equipment rack. The boX is
1.1 BA
GENERAL
48.3 em (\9 in) wide, approximately 13.2 em (5 3/16 in) high, and 57.8 em (22 3/4 in) deep. It contains
cooling fans, ac input unit, power supply, and a 9-s10t backplane that accepts LSI-ll double-height
and quad-height modules. The BA ll- N can have a blank front panel or a bezel that is equipped with
operating switches and statuS indicators. Figures I-I and 1-2 show the BAII-N with a bezel and a
blank panel, respective\y.

Figure 1-1

BA11-N with Front Beze\

1-1

MA-0767

Figure 1.2

BAll·N with Blank Front Panel

The mounting box is available for both 115 V and 230 V systems. Because a choice of front panels is
also provided, the user can select any of the following BA 11·N models.

Model

Primary power /Front Panel

115 V /bezel panel
BAl1·NC
230 V /beze1 panel
BAl1·ND
115 V /blank panel
BAll·NE
230 V /blankpanel
BAll·NF
Figure 1-3 shows the BA 11_N with the logic box coverrem oved . The ac input box, powersuppIy, and
H9273 logic assembly (which includes the fans and the backplane) are attached to the logic box base;
the bezel is attached to the power supply. The power supply assembly is hinged to the base and can be
swung open to expose the internal components; with little effort, the entire assembly can be removed
from the base and replaced. LSI-II modules are inserted in the backplane from the rear of the box
through an access door that is equipped with strain reliefs for LSI bus cables and communications
cables (Figures 1·4).
When the unit is to be mounted in an equipment rack, the logic box cover is attached to the rack with
n
mounting hardware. The logic box base slides into the mounted cover and a spring"butto assembly
engages to prevent the base from being pulled out of the cover in error.

1·2

H9273 LOGIC ASSEMBLY
(INCLUDES CARD FRAME BACKPLANE. AND FANS)

AC INPUT BOX

MA-0777

Figure 1-3

BAll-N, Logic Box Cover Removed

a C\
o 6 ~BmBDmD
70BA

115V AC

~BmBDmD

~ NEPATYPEII

115VOLTS
50-60 HERTZ 1 PH

12AMPS
3 WIRES

MODEL
BA11-NC
SN:

MAX. A. C. OUT
6A@115V
3A@230V

[~]~~:~~ L..-..-I---II I
0

II
MA-0745

Figure 1-4 BA 11-N, Rear View

1-3

1.2 BAll-N APPLICATIONS
The BAll-N can be used in several ways: as the mounting box for a PDP-ll/03L system, which
consists of a KDll-R microcomputer, a BDVll-A (terminator, boot, and diagnostic module), and
other LSI-ll modules that the user might select; as an expander box for an existing PDP-ll/03L
system; and as an expander box for a PDP-l 1/03 system (refer to the 1977-1978 Microcomputer Handbook for a description of this system). Figure 1-5 illustrates these possibilities and includes inter- i
connecting cable designations. Notice that an LSI-II system can include as many as three backplanes, ;
i.e., one in the main box, which contains the central processor unit (CPU), and one in each expander
box. Each expander of a PDP-ll/03L system is physically indentical to the main box, with the possible
exception of the front panel (usually, only one bezel per system is desired); however, the BAtl-N
differs in height from the PDP-Il/03 and the BAIl-M expander box.

LSI-11
PDP11/03
(BA11-M)

LSI-11
PDP11/03 L
(BA11-N)

I
I
I
BCV1B
CABLE

BCV1B
CABLE

I
I

1
BA11-M
EXPANDER BOX

r-- -1_ - - ,
I

BA11-N
EXPANDER BOX

I
I

BA11-N
EXPANDER BOX

I
I
I

L __ -,- __ ..J
f

I
I

BCV1A
CABLE

r--J- --,
I

r--...l---,

BCV1A
CABLE

BA11-N
EXPANDER "BOX

BA11-N
EXPANDER BOX

L _ _ _ _ _ .J

BA11-N
EXPANDER BOX

L _____ J

I
I

NOTE:
DOTTED LINES REPRESENT
OPTIONAL EXPANSION
MA-0739

Figure 1-5

BAll-N System Applications

1-4

1.3 LSI-ll BACKPLANES
The BA 11-M mounting box uses the H9270 backplane. The connectors that comprise this backplane
are arranged on an etched circuit board in four rows, each row containing two 72-pin connectors
(Figure 1-6). A connector has two slots, each of which contains 36 pins, 18 on either side of the slot.
Most of the pins of slot A, row 1, are etch-connected to corresponding pins not only in slot C, row 1,
but also in slots A and C of rows 2, 3, and 4. For example, pin D, slot A, row 1 is common with pin D,
slot C, row I, as well as with pin D in slots A and C of rows 2, 3, and 4. Most of the pins of slots Band
o are interconnected (bused) in the same way. (Refer to Chapter 3 of the 1977-1978 Microcomputer
Handbook for instructions on identifying individual slot and module pins.)

CONNECTOR 1

r
ROW 1

ROW2

ROW3

ROW 4

CONNECTOR 2

.........
SLOTA

SLOT B

\ r

II
I,
II
I,

SLOTC

SLOT 0

II
I,

III
,I,

,I,

VIEW IS FROM MODULE SIDE OF CONNECTORS
MA-0734

Figure 1-6

H9270 Backplane Connectors

LSI-II modules are mounted in the backplane by inserting the module finger connectors into the
backplane slots. If the module is double height, module connector A (the right-most connector when
viewing the component side of the module with the module fingers pointing down) is inserted in slot A
or C of the backplane, and module connector B is inserted in slot B or D. A quad-height module has its
A through 0 connectors inserted in slots A through D, respectively. The LSI-II bus signals are present
on the pins of slots A and B; the same set of bus signals is present on the pins of slots C and D.
However, priority considerations and the fact that some connector pins are not bused result in certain
restrictions on module placement (refer to the 1977-1978 Microcomputer Handbook for details). In
general, modules should be installed in the backplane as illustrated in Figure 1-7. That is, the CPU
module must be placed in the top row and the options must be placed to reflect their assigned priorities
(option I has the highest priority). There must be no empty option locations between the CPU and
options that use either the interrupt acknowledge signals or the direct memory access (DMA) grant
signals of the LSI-II bus.

1-5

SLOTA

--'.

ROW 1

SLOTB

--'-

CPU

SLOTC

SLOT 0

MODULE

ROW2

OPTION 2

OPTION 1

ROW3

OPTION 3

OPTION 4

ROW4

OPTION 6

OPTION 5

VIEW IS FROM MODULE SIDE OF CONNECTORS
MA-0735

Figure 1-7

Module Installation in the H9270 Backplane

It is apparent that at times the utility of the H9270 backplane decreases when quad modules are

inserted; i.e., a quad module uses four backplane slots even though it can take all the bus signals it
needs from just two of these slots. Furthermore, the individual modules of multiple-module options
must be connected with over-the-top connectors, which consume board space that could otherwise be
occupied by circuit components. The new H9273 backplane has a unique design that overcomes these
deficiencies.
The H9273 backplane is used in the BAII-N mounting box. The connectors that comprise this backplane are arranged in nine rows, each row containing two 72-pin connectors (Figure 1-8). As in the
H9270 backplane, a connector has two slots, each of which contains 36 pins, 18 on either side of the
slot.
LSI-II modules are inserted (physically) in the H9273 backplane in the same way as they are in the
H9270 backplane. However, the H9273 is wired differently and provides unique advantages; this
uniqueness also results in more restrictions on module placement.
The connectors designated "Connector 1" in Figure 1-8 are wired (etch connections) in parallel. When
a CPU is inserted in slots A, B, C, and D of row 1, slots A and B carry the LSI-II bus signals
(alternatively, the bus signals can be continued from an earlier backplane by an interconnecting double
module inserted in slots A and B); thus, slots A and B are termed the LSI-II bus slots. The connectors
designated "Connector 2" are not wired in parallel, except for +5 V and ground, and (other than +5 V
and ground) have no connections to the LSI-ll bus. Rather, C- and D-slot pins in each row are
connected to C- and D-slot pins in adjacent rows. For example, pins in row 4 are connected to pins in
row 3 and row 5. If one puts a module in the C and D slots in rows 3, 4, and 5, and ifthe fingers on the
module connectors are jumpered properly, a J-row bus is formed. Buses of varying lengths can be
formed by correctly wiring the modules that make up a module set; hence, slots C and D are termed
the CD bus slots.

1-6

CONNECTOR 2

CONNECTOR 1

r~------------~~----------~, r~----------~~~------------,
SLOTA

SLOTB

SLOTC

SLOT D

ROW 1

ROW2

ROW3

ROW4

ROW5

ROW6

ROW7

ROWS

ROW9

VIEW IS FROM MODULE SIDE OF CONNECTORS.
MA·0740

Figure 1-8

H9273 Backplane Connectors

Figure 1-9 illustrates a possible configuration of modules in an H9273 backplane. LSI-ll doubleheight modules are inserted in LSI bus slots A and B (if one or more of the LSI modules happened to
be quad modules, one or more of the CD bus option modules would have to be removed). Two CD bus
options are depicted. The option designated option 1 consists of two double modules and one quad.
module that interfaces the CD bus to the LSI-ll bus; while that designated option 2 consists of three
double modules and one quad module that interfaces with the LSI bus. The BAll-N Mounting Box
Technical Manual describes the H9273 backplane in detail and provides more information concerning
CD bus module design.
CAUTION
Quad modules that use LSI-ll bus signals must take
these bus signals only from slots A and B of the backplane. The single DIGITAL option that does not satisfy this requirement is the MMVll which,
consequently, cannot be used in the H9273 backplane.

1-7

I
I

SLOTA

SLOTB

I
I

I I
I

SLOTC

SLOTO

ROW1

CENTRAL PROCESSOR UNIT

ROW2

LSI-11 OPTION 1

CD BUS OPTION 1

ROW3

LSI-11 OPTION 2

CD BUS OPTION 1
CD BUS OPTION 1

ROW4
ROW5

LSI-11 OPTION 3

CD BUS OPTION 2
CD BUS OPTION 2

ROW6
ROW7

LSI-11 OPTION 4

CD BUS OPTION 2

ROWS

LSI-11 OPTION 5

CD BUS OPTION 2

ROW9

BDV11-A

(BUS TERMINATOR) MODULE.

VIEW IS FROM MODULE SIDE OF CONNECTORS
MA-0746

Figure 1-9

Module Installation in the H9273 Backplane

1.4 MODULE LOADING OF THE LSI-ll BUS
When organizing a system, one must give particular attention to three characteristics of each module,
namely, bus ac loading, bus dc loading, and power consumption. Bus ac loading refers to the dynamic
impedance that an element presents to an LSI-II bus signal line. This impedance, which is due to etch
runs, receiver input loading, and driver output loading, causes a reflection to occur when a step is
placed on the signal line. This reflection manifests itself as a spike that occurs just after an asserting or
negating edge. If too many elements are placed on the bus, the total impedance presented to a particular signal line can produce a reflection of unacceptable magnitude; thus, a false logic signal that might
cause a failure is created. Such a false logic signal is illustrated in Figure 1- 10, which shows the threshold level of an 8640 bus receiver being crossed twice because of the lumped-load reflection.

Bus ac loading is described in terms of ac loads, an ac load being defined as 9.35 pF (nominal) of
capacitance. The ac load rating of a bus element is based on the largest of the capacitances that the
element presents to the BDOUT, BDIN, BRPLY, BSYNC, BREF, and BSACK signal lines. For
example, if the element presents two ac loads (approximately 18.7 pF) to the BDIN line and four ac
loads (approximately 37.4 pF) to the BSYNC line, the element is rated at four ac loads.
In a single-backplane system, the bus can support 20 ac loads with the termination that is available on
the processor module. If the other end of the bus is terminated with 120 n, the number of ac loads can
be increased to 35. Keep in mind that this applies only to the system with one backplane; if the bus is
extended off this backplane in any way, a multiple-backplane system results and the rules change.
Incidentally, the backplane, itself, loads down the bus; consequently, the ac loads attributable to the
backplane must be added when determining the total ac load. AC loads for LSI-II modules are listed
in the Option Summary Chart, Table A-I, along with backplane configuration charts that also appear
in Appendix A.

1-8

--I

DRIVER WAVEFORM

+
REFLECTION FROM
LUMPED LOAD

8840 RECEIVER
THRESHOLD

NET WAVEFORM
AT RECEIVER
MA·0741

Figure 1-10 AC Loading Violation

Bus dc loading refers to the dc leakage current that an element presents to an LSI-II bus signal line
when that line is high (undriven). If too many elements are placed on the bus, the quiescent (undriven)
voltage may be lowered to such a level that bus receivers become susceptible to reflections from lumped loads; furthermore, the overall noise margin on the high end (bus undriven) may become too
small.
Bus dc loading is described in terms of dc loads, a dc load being defined as 105 fJ.A (nominal) of leakage
current (105 fJ.A is the total of 80 fJ.A of receiver leakage current and 25 fJ.A of driver leakage current).
The dc load rating of a bus element is not based strictly on the signal line that has the greatest leakage
(e.g., dc leakage is less important on BDAL lines than on the BSYNC line); hence, the dc load for an
element should always be obtained from the specification for that element.
In both single- and multiple-backplane systems, the maximum number of dc loads allowed is 20 (backplanes have zero dc loads). DC loads for LSI-ll modules are listed in the Option Summary Chart,
Table A-I. Loading for customer-designed modules will have to be determined by calculation of receiver and driver leakage currents.
Power consum ption refers to the amount of current that must be provided by the power supply associated with each backplane. The total current to be drawn from the +5 V source must be determined
separately from that to be drawn from the +12 V source. Naturally, each total must be less than the
maximum rated output current for that source.
The amount of current required by each LSI-II module is listed in the Option Summary Chart, Table
A-I. The current loads are given in values that are typical; thus, the total current needed by the system
modules is typical rather than maximum. To allow for atypical amounts of current that might be
drawn by individual modules, observe this rule of thumb: keep the amount of current to be drawn
from a power supply to 70 percent, or less, of the supply's maximum rated current.
It is evident that the effects of bus loading and power consumption must be considered when a system
configuration is devised. Appendix A contains not only an Option Summary Chart, Table A-I, and
backplane configuration diagrams, but also a number of rules and guidelines concerning the configuration of LSI-ll modules. Refer to this appendix when planning and/or installing a system.

1-9

1.5 SPECIFICATIONS
Tables I-I and 1-2 list significant BAII-N mounting box specifications.

Table 1-1

BAll-N Specifications

Item

Specification

Dimensions (including bezel)
Width
Height
Depth (without mounting brackets)
Depth (with mounting brackets)

48.3 cm (19 in)
13.2 cm (5.19 in)
57.8 cm (22.75 in)
67.96 cm (26.75 in)

Weight (without modules)

20 kg (44 lb)

Operating Temperature*

5° C-50° C (41 ° F-122° F)

Operating Humidity

10%-95%, with a maximum wet bulb temperature
of 32° C (90° F) and a minimum dew point of 2° C
(36° F)

Input Voltage

115 Vac (BAII-NCjNE), 230 Vac (BAIINDjNF)

Input Current**

12 A, Max (BA I1-NCjNE), 6 A, Max (BA 11NDjNF)

Circuit Breaker Rating

15 A @ 115 Vac or @ 230 Vac

*The maximum allowable operating temperature is based on operation at sea level, i.e., at 760 mm Hg (29.92 in
Hg); maximum allowable operating temperature will be reduced by a factor of 1.8° C/1000 m (1.0° F /1000 ft)
for operation at higher altitude sites.
When the equipment is being operated at the maximum allowable temperature, air flow must maintain the inletto-outlet air temperature rise to a maximum of 7° C (12.5° F).
**1 nput current consists of that used by the BA II-N, itself, plus whatever current is supplied via the convenience
ac outlet (13) to an expander box; the total current must be less than the maximum specified.

1-10

Table 1-2 BAll-N Power Supply Specification
Item

Specification

Current Rating

5.5 A @ 115 Vrms
2.7A @ 230 Vrms

Inrush Current

100 A, peak, for 1/2 cycle at 128 Vrms or 256 Vrms

Apparent Power

630 VA

Power Factor

The ratio of input power to apparent power shall
be greater than 0.6 at full load and low. input voltage .

Output Power

. +5 Vdc, ±250 mY, @22 A (A minimum of 2 A of
+5 Vdc power must be drawn to ensure that the
+ 12 Vdc supply regulates properly; however, the
+ 12 Vdc output will not go above 12.6 Vdc no matter what +5 Vdc current is drawn).
+J2 Vdc, ±600 mY, @ 11 A

Power Up/Power Down
Characteristics
Static Performance
Power Up
Power Down
Dynamic Performance (Figure 1-11)
Power Up

Power Down·

BDCOK H goes high: @ 75 Vac
BPOK H goes high: @ 90 Vac
BPOK H goes low: @ 80 Vac
BDCOK H goes low: @ 75 Vac
3 ms (min) from dc power within specification to
BDCOK H asserted.
70 ms (min) from BDCOK H asserted to BPOK H
asserted.
4 ms (min) from ac power off to BPOK H negated.
4 ms (min) from BPOK H negated to BDCOK H
negated.
5 IJ.S (min) from BDCOK H negated to dc power
out of specification.

*Figure 1-12 shows power interruption ride-through characteristics for the H786 power supply used in the PDP-

1l/03L.

~
4 MS (MIN) ~

L - - - 70 MS ----.I
r
(MIN)
"1

3 MS (MIN)

AC INPUT

-I I+-

..j I- 5 pS (MIN)

~I-I----------~S~S--------~I

\'--_ _ _
1 _I_ _

DCOU,,",

BOCOK H

4MS(MIN)

SS~------------~~

~------------~~rf--------------~~

r----"""'s t-$- - - - - - - - . . . ,

BPOKH

I-

POWER-UP
SEQUENCE

--I

POWER-OOWN-\
SEQUENCE
MA-0764

Figure 1-11

Power Up jPower Down Timing

1-12

130

120

~
...

0
~
w
c:J
c(

...0
~

110

::I
~

!
~

TO OBTAIN TIME FOR PARTIAL
LOADING MULTIPL Y BY THE RATIO
OF FULL OUTPUT POWER TO
PARTIAL OUTPUT POWER, E.G.,
t 11/2 LOAD) = t (FULL LOAD X 100%150%

100

40
4.8 ms

9.8 ms

30.4 ms

100

120

TIME(MILLISECONDS)
MA-0761

Figure 1-12 H786 Power Supply Minimum Ride-Through
After Power Interruption

1-13

1.6 RELATED DOCUMENTS
The following DIGITAL publications contain information for the BAll-N user.
Publication

Document Number

Remarks

BA 11-N Mounting Box
Technical Manual

EK-BA 11N-TM-001

In microfiche library;· Available in
hard copy"

BDVI1-AA Technical Manual

EK-BDVII-TM-001

In microfiche library; Available in
hard copy··

BDV11-AA User's Guide

EK-BDVII-UG-OOI

Not in microfiche library; hard copy
ships with device: available in hard
copy··

1977-1978 Microcomputer Handbook
(2nd Edition)
EB-07948-53/77

Available in hard copy··

PDP-II Software Handbook

Available in hard copy"

General information concerning educational and maintenance services provided by DIGITAL, as well
as equipment warranty statements, can be found in the 1977-1978 Microcomputer HandbQok.

*For information concerning microfiche libraries, contact:
Digital Equipment Corporation
132 Parker St.
Maynard, MA 01754
ATTN:

MicropUblishing Group
PK3-2/Tl2

**These documents can be ordered from:
Digital Equipment Corporation
444 Whitney St.
Northboro, MA 01532
ATTN:

Communications Services (NR2/M 15)
Customer Services Section

1-14

CHAPTER 2
UNPACKING, INSTALLATION, AND OPERATION

2.1 UNPACKING
,
The BAII-N is shipped in a protective box. Remove the BAII-N from the box and visually inspect for
damage. Save the shipping cartons and packaging materials in case it is necessary to return the unit for
service.
2.2 INSTALLATION
Physical installation of the system can begin when the shipment has been unpacked and checked for
completeness. This paragraph gives instructions for setting up the system. The user might consider, at
some time, to either add to an existing system or create a new system. If so, check the appendix, which
contains important information concerning backplane and module configuration.
2.2.1 Preliminary Checks
Before installing the logic box base, check the features described here.
2.2.1.1 AC Voltage Selection - The BAll-N can be used with line voltage of either 115 Vac or 230
Vac. Only the ac line cord is different for the two voltages. However, a voltage selecting switch must be
set to a position that corresponds to the line voltage being used. This switch is located on the rear of
the ac input box, above the circuit breaker (Figure 2-1). The switch lever protrudes through a plate that
is attached to the box. If the line voltage being used is 115 Vac, the designation "115 Vac" should be
printed on the plate above the switch lever. If the printing on the plate is 230 Vac, remove the plate.
Flip the plate over and notice that 115 Vac is printed on the opposite side; also, notice that the switch
lever itself is imprinted with 230 Vac. Move the switch lever down; 115 Vac should appear on the top of
the lever. Replace the plate over the switch lever so that the printing on the outside of the plate says 115
Vac (when the plate is on, the printing on the switch lever cannot be seen). The plate is fabricated so
that the screw holes in the plate and the input box line up only when the switch position corresponds to
the printing on the outside of the plate.
2.2.1.2 Backplane Jumper Positions - There are three jumper positions, WI, W2, and W3, on the
H9273 backplane (Figure 2-2). Jumpers are installed in all three positions when the backplane is
manufactured. Table 2-1 summarizes the conditions under which jumpers should be inserted or removed.
The jumper in position WI is involved with CPU event interrupts. These interrupts can be initiated in
two ways. First, an external (to the BAII-N) signal source can be used to pull the LSI-II bus BEVNT
L line low; in this case, the jumper in WI of each H9273 backplane in the system would have to be
removed. Second, the LTC signal generated in the H786 power supply can be used to pull the BEVNT
L line low, thereby initiating vectored interrupts at a rate that depends on the BAII-N line frequency.
WI connects the LTC signal to the BEVNT L line; hence, in this case, the jumper would be left in
position WI of the H9273 backplane. In a multiple-box system, the box containing the M8012 module
(i.e., the last box in the system) must be the source of the LTC signal; thus, the WI jumper must be
inserted in the backplane of this box and must be removed from the backplane of the other box(es).

2-1

VOLTAGE
SELECT
SWITCH

Co:\ 708A
~

NEPATYPEII

115V AC

MA-0743

Figure 2-1

BAII-N Voltage Select Switch

2-2

MA-0747

Figure 2-2

Backplane jumpers

2-3

Table 2-1

Backplane Jumpers

Jumper Position

Jumper(s) In

J ulilper( s) Out

When the H786 power supplygenera ted LTC signal is used to assert
the LSI-II bus BEVNT L signal.

When it is not desired to have line
time clock (LTC) sourcing BEVNT L,
such as when an external source is
used instead.

W2, W3

When a quad KD 11 CPU is inserted in row 1 of the backplane.

When any other module is installed in
row 1, i.e., when the backplane is part
of an expander box.

The jumper in W2 connects CKI to CLl in row 1, while the jumper in W3 connects DKI to DLl, also
in row 1. These jumpers must be inserted whenever a quad KDII CPU resides in row 1 of the first box.
All three of these jumpers can be inserted and removed without any need for disassembly, other than
removing the logic box base from the cover.
2.2.1.3 Bezel Assembly Jumper Positions - There are four jumper positions, WI, W2, W3, and W4, on
the printed circuit board of the bezel assembly (Figure 2-3). When the board is manufactured, jumpers
are inserted in positions WI, W2, and W4; position W3 is left blank. Table 2-2 describes the conditions
under which jumpers are inserted or removed.
·2.2.1.4 Power Controller Cable Installation - In an extensive system, it is convenient to be able to turn
on the power to each unit from a central point, rather than turning on each unit individually. This can
be done by incorporating a power controller (such as the DIGITAL 86I-C model) into the system. The
power conroller is plugged into the ac main and each unit is plugged into the "switched" outlets on the
controller. If each unit's ON/OFF switch is kept in the ON position, the ON/OFF switch on the
power controller can be used to apply and remove power for all system units simultaneously.
Furthermore, the power controller ON/OFF switch can be configured so that power control can be
effected from some other location, e.g., from the AUX ON/OFF switch of the BAll-N bezel. (Paragraph 2.2.4 shows possible power connection schemes for the PDP-I 1/03 and PDP-II/03I1systems.)
If the user intends to incorporate a power controller into the system and wishes to use the bezel AUX
switch to turn system power on and off, a twisted-pair cable is available. The Mate-N-Lok TM connector on this cable is plugged into J2 of the bezel assembly printed circuit board (Figure 2-3). The
open end of the cable can then be connected to the power controller ON/OFF switch so that the two
switches are in parallel. If the controller switch is kept open, the A UX switch can control system power
application.

If the cable is not already installed in the bezel assembly, plug the connector into J2 of the assembly
printed circuit board. Route the cable down the left side of the unit and out the rear under the nearer
cable strain relief.

TMMate-N-Lok is a trademark of AMP, Inc.
2-4

SIDE2

0
0----0 0
0
0
0w2'0 0
0----0----0

-~"

IT}

SWITCH CONTACTS
(53.52.51)

LED CONTACTS
(RUN. PWR OK)

NOTES:
1. VIEW IS FROM THE REAR OF THE BEZEL
WHEN THE BOARD IS MOUNTED ON
THE BEZEL.
2. JUMPERS ARE MOUNTED ON SIDE 1.
MA-0737

Figure 2-3

Table 2-2
Jumper Position

Bezel Printed Circuit Board

Bezel Assembly Jumpers

Jumper In

Jumper Out

WI, W2

When the bezel AUX ON/OFF
switch is used to control the power
supply generated LTC signal (when
the switch is in the AUX ON position, LTC-initiated interrupts are
possible).

When the bezel A UX ON/OFF
switch is used to turn the system
power controller on and off (Paragraph 2.2.1.4).

When the bezel is to be mounted on
an expander box (W3 permits the
HALT switch to light the RUN indicator).

When the bezel is part of the main
box, i.e., the CPU is mounted in this
. bezel's backplane.

When the bezel is part of the main
box (W 4 enables the S RUN L signal to light the RUN indicator).

When the bezel is mounted on an expander box.

2-5

2.2.1.5 Module Insertion and Removal - Modules must be inserted and removed only when the power
is turned off. Use the front panel AUX ON/OFF switch or the ON/OFF switch on the rear of the ac
input box to turn off the power (refer to Paragraph 2.3 for a description of each of these switches).
Some quad modules are equipped with metal extractor-type handles that facilitate module insertion
and removal. When inserting such a module into the backplane, begin by sliding the module, component side up, into the card guides. Slide the module all the way in and just start the module connector fingers into the backplane connectors. Fit the prongs of the handles into the holes in the card
frame, as shown in Figure 2-4. Press in on both handles simultaneously to fully insert the fingers in the
backplane connector.
To remove a module, pull both handles out simultaneously until the prongs of the handle are clear of
the holes in the card frame. The module fingers will now be nearly free of the backplane connector and
the module can be removed easily.
CAUTION
Modules and/or the backplane assembly might be
damaged if modules are inserted and removed with
the power on, or if the modules are inserted upside
down.
2.2.1.6 Module Installation - The equipment is shipped from the factory with the modules installed.
Bus cables and communication cables must be connected to the modules, if not already in place. When
removing modules to connect cables, or when installing new modules in an existing installation, follow
these guidelines:
1.

Ensure that double-size modules are inserted correctly in the backplane; i.e., LSI-ll bus
modules plug into slots A and B (the two left-most slots), CD bus modules plug into slots C
and D, and both types must be inserted right-side up.

The CPU can be inserted only in bus position 1 of the H9273 backplane (,'bus positions" are
defined in the backplane selector charts, Figures A-I and A-2).

An M8012 module (BVDI1-A) must be inserted only in the last bus portion of the last box
(if the module is not in the last bus position, the diagnostic light display cannot be seen).
Ensure that jumper WI is in place in the backplane of the last box; other backplanes must
have the jumper removed (Paragraph 2.2.1.2).

If a module uses the LSI-II bus grant and interrupt signals (BDMGI L/BDMGO Land
BIAKI L/BIAKO L, respectively), there.must be no empty LSI-II bus positions between
the module and the CPU, although empty CD bus positions .are permitted.

Always ensure that modules are seated firmly and securely in the backplane.

The +5 Vdc regulated voltage is rated at 22 A, full load, while the +12 Vdc regulated
voltage is rated at 11 A, full load. When installing new modules in a system backplane, take
care not to exceed the full-load limits. Table A-llists LSI-II modules, their power requirements, and their sizes.

2-6

TO REMOVE MODULE

EXTRACTOR-TYPE HANDLE

BACKPLANE CONNECTOR
MA-0755

Figure 2-4

Insertion and Removal of Modules Having Extractor-Type Handles

2-7

2.2.2 Mounting the Logic Box Cover in an Equipment Rack
Use the following procedure to mount the logic box cover in an equipment rack. Figure 2-5 shows the
mounting dimensions and illustrates the cover mounted to the four cabinet uprights. The item callouts
in Figure 2-5 and in the following mounting procedure are identified in the unit assembly drawing,
Figure 2-6, and its associated parts list, Table 2-3.

CAB. UPRIGHTS

REF

63.5CM
(25.00 IN.) REF

29 (OTY 8) REF

12 (OTY2)

46.5CM
(18.311N.) REF

r - - - - - 3.73 CM
(1.47 IN)

13.18 CM
(5.19IN)
30) (OTY 8) REF
31
5.71 CM
(2.25 IN.)
MA·0776

Figure 2-5

BAll-N Cover Mounting Dimensions

2-8

LEGEND
NUMBER
BA11-NC
BA11-ND
BA11-NE
BA11-NF

AMPS

PHASE/WIRE

12A
6A
12A
6A

SINGLE/3
SINGLE/3
SINGLE/3
SINGLE/3

VARIATION
VOLTS
HZ

115 V
230 V

SO/50 HZ
SO/50 HZ
50/60 HZ
SO/50 HZ

BEZEL ASSY/SWITCHES
BEZEL ASSY/SWITCHES
BEZEL BLANK
BEZEL BLANK

P3 TO

f-v~*----;-- FAN #2

TO (J8) OF H9273
17 LOGIC ASSY
10

6 REF

28
DETAIL "A"
FOR VARIATION
-NC & -NO ONL Y

28
DETAIL "B"

MA-0774

Figure 2-6 BAII-N Unit
Assembly Drawing

2-9

Table 2-3 Parts List
U

<
=:l

-(
=:l

<
=:l

-(
=:l

2
I

2
1

- -- - ~

Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

Part No.

17-00083-02
17-00090-00

90-06035-01
90-06634-00

90-08196-00
90-06563-00
90-08404-02
90-07082-00
90-06037-01
90-06632-00
90-08032-01
36-12450-00
90-07880-00
90-07786-00
90-07651-00
90-06073-03

Description
Brkt Bezel Mtg
Bezel Assy with Switches
Bezel Blank
Line Cord (115 V), USA
Line Cord (250 V), USA
Base, Logic Box
Door Assy
Logic Assy (H9273)
AC Input Box (H403-A)
Pwr Supply Assy (H786)
Clamp, Hinge
Brkt Support
Scr PHL Hd Pan No. 8-32X.25
Washer, Lock No.8
Harness ac Power
Harness dc
Cable Backplane
Cover, Logic Box
Receptacle, 1/2 Turn
Nut, Keps No. 8-32
Scr PHL Hd Flat No. 6-32X.31
Cable Clamp 0.31 dia.
Scr PHL Hd Pan No. 8-32X.38
Spring, Button Assy
Washer, Lock Int Tooth No.4
Screw PHL Hd Pan No. 4-40X.19
Label Serial
Tie, Cable SST 1.5 m
Nut, Tinnerman No. 10-32
Washer, Lock Ext. Tooth No. 10
Scr, PHL Truss Hd No. 10-32 X 50
Logo, PDP-II /03-L
Cable Console

2-11

- - 1
1
- 1
- 1 1
I
I
1
1
2
2
12
21
1
1
1
1
2
2
2
1
9
1
2
2
1
3
8
8
8
1
1

1
I
1
1
1
2
2
12
21
1
1
1
1
2
2
2
1
9
1
2
2
1
3
8
8
8
1
1

1
I
1
1
1
2
2
12
21
1
1
1
1
2
2
2
1
9
1
2
2
1
2
8
8
8

1
1
1
1
1
1
2
2
12
21
1
1
1
1
2
2
2
1
9
1
2
2
1
2
8
8
8

When the unit is shipped, the logic box cover is held to the base by four screws (these are
used only innonrack·mounted applications) and a single shipping screw, which, for safety,
must be in place whenever the unit is moved or shipped. First, remove the four screws (Item
13) thaUattach the cover to the base; then, open the rear door (Item 7) and remove the
shipping screw (Item 23).

A safety locking device is found on the right side of the unit (when looking at the front). This
device, a spring·button assembly (Item 24), is attached to the side of the ac input box. When
the unit is closed, the button on this assembly fits into the rear hole of two holes in the right
side of the cover. This mechanical interlock can be overridden by pushing the button in from
the outside of the cover while, at the same time, pulling out the logic box base to get the
button past the hole. The base can then be pulled out of the cover to its extended position; at
this position, the button pops into the front of the two holes, preventing the base from being
inadvertently pulled entirely out of the cover. Open the base to the extended position and
then release the button from the front hole. Slowly pull the base entirely out of the cover and
set the base out of the way.

Attach the Tinnerman nuts to the cabinet uprights in eight places as indicated above.

Mount the cover (Item 18) to the front cabinet uprights using four pan head screws No. 1032 X 0.62 LG (Item 31), and four No. 10 flat washers (Item 30).

Attach the two support brackets (Item 12) to the cover using four Phillips pan head screws
No. 8-32 X 0.38 LG (Item 23), and four No.8 lock washers (Item 14).

Attach the support brackets (Item 12) to the rear cabinet uprights using four Phillips pan
head screws, No. 10-32 X 0.62 LG (Item 31), and four No. 10 flat washers (Item 30).

Slide the unit into the cover. It will be held in place by the spring button (Item 24). To slide
the unit forward again it will be necessary to release this spring button.

If the system is to be moved or shipped, the shipping screw (Item 23) must be replaced.

2.2.3 .Installing the Logic Box Base in the Cover
Set the rear of the logic box base on the support flanges of the cover and slide the base in until the
spring-button assembly engages in the extended position. Take care not to pinch the cables while
sliding the base in. Release the spring button anQ push the base all the way in until it engages in the
closed position. Take the following steps to complete the installation.
Note
The base being installed is either the main base, i.e.,
the one containing the CPU, or an expander base
(two expander boxes can be added). Modify the following instructions to suit the kind of base you are
installing; e.g., if there is a blank front panel, skip
the first half of Step 1.
1.

Put the AUX switch on the front panel in the OFF position; put the ON/OFF switch on the
ac input box in the OFF position.

2·12

When the A UX switch on the front panel is in the ON position, the two wires of the power
controller cable are common (Paragraph 2.2.1.4). Connect the free end of the cable to the
input circuit of the power controller so that the AUX switch controls the application of
primary power to the controller. Keep the AUX switch in the OFF position.

Loosen the cable strain reliefs and open the rear door of the box to install the LSI-II bus
expansion cable assemblies. Two cable assemblies are used. Table 2-4 describes the assemblies and tells where to insert the assembly modules (Figures A-4 through A-8 illustrate
module placement). When inserting the modules, make sure the connectors are on top.

Close the rear door; bring the bus cables out under the left strain relief and the communication cables out under the right strain relief. Adjust the strain reliefs so that the cables are
held firmly but are not pinched or crushed. Secure the strain reliefs and the rear door. Make
sure the cables will not bind when the base is pulled out to the extended position.

Table 2-4

LSI-ll Bus Expansion Cable Assemblies

Assembly

Assembly Composition

BCVIB-XX

Two BCOSL-XX cables
One M9400-YE module

One M940I module
BCVIA-XX

Two BCOSL-XX cables
One M9400-YD module

One M940I module

Insert Modules In
Slots A and B of the first open row after all other
LSI-II bus options have been installed in the main
box.
Slots A and B of row 1 of expander box 1.
Slots A and B of the first open row after all other
LSI-II bus options have been installed in expander
box 1.
Slots A and B of row 1 of expander box 2.

NOTE
"-XX" in the cable assembly number denotes length,
which can be 2,4,6, or 10 ft (each cable of an assembly is the same length.) When both assemblies are
used in a system (three boxes), the lengths must
differ by 122 cm (4 ft). To facilitate servicing, the
BCVIB cables should be 183 cm (6 ft) long, while the
BCVIA cables should be 305 cm (10 ft) long.

2-13

2.2.4 Power Connections
The individual mounting boxes of a multiple-box system can be connected to a power source in different ways. Figure 2-7 shows how one might connect the boxes in typical PDP-II /03L systems involving
only BAII-N mounting boxes. In Figure 2-7a the first expander box gets primary power from the ac
outlet (13) on the main box, which can be connected to a switched or unswitched source. If the source
is switched, the ON/OFF switch on each ac input box is left in the ON position and power is controlled by the source ON/OFF switch; if the source is unswitched (an ac wall outlet, for example), the
ON/OFF switch on the ac input box of the PDP-II/03L controls power to the first two units (the
ON/OFF switch of the first expander is left in the ON position). Because of power limitations, the
second expander box cannot receive power from the ac outlet on expander box 1; instead, J2 of expander box 2 must connect to the external power source.
In Figures 2-7b and 2-7c, each BA 11-N is connected to a power controller; however, the controller is
turned on and off from different locations. That is, in Figure 2-7b the switch that turns power on and
off is located on the power controller oris at some place external to the controller. In Figure 2-7c, the
switch that turns power on and off is the AUX ON/OFF switch on the PDP-II/03L front panel.
Figure 2-8 illustrates how to connect typical systems that use both BAII-M and BAll-N mounting
boxes. In Figure 2-8a, a BAll-N is shown as an expander to an existing PDP-I 1/03 system that
consists of two BAII-M mounting boxes (refer to the 1977-1978 Microcomputer Handbook for information concerning power installation of BAll-M expander boxes). As in Figure 2-7b, ac power is
controlled from the power controller or from an external source.
The system depicted in Figure 2-8b, shows a PDP-Il/03 system being expanded by two BAIl-M
expander boxes. Such a system can arise when a user with an existing PDP-I 1/03 (BAII-M box)
system wishes to expand with the larger capacity BAII-N mounting boxes. By purchasing the BAII-N
with a front panel, the user can convert the PDP-II /03 to a PDP-II /03L, controlling the entire system
power as described for Figure 2-7c.
2.2.5 Installation Verification
When the installation is completed, check the operating condition of the equipment. This is a relatively
easy task if the system is a PDP-ll/03L. This system includes a BDVII-A terminator, boot, and
diagnostic option. When the PDP-II/03L system power is turned on, or when the system is restarted,
diagnostic programs implemented by the BDVII-A are automatically started and carried out. These
diagnostics verify the operation of a number of options that the user might have in his system. The
diagnostic package is contained in the PDP-II/03L print set, MOO486. Refer to the BDV11-A User's
Guide for operating instructions.
Options that are not checked by the BDVIl-A option have a separate diagnostic program available.
Refer to Section 4 of the 1977-1978 Microcomputer Handbook for a description of LSI-II system
software and for instructions concerning diagnostic programs.
When problems are encountered with system options, refer to the appropriate option technical manual
for instructions. For those problems that are isolated to the BA 11-N, itself, refer to Chapter 4 of the
BAII-N Technical Manual, which contains some troubleshooting hints and procedures.
2.3 OPERATION
The BAII-N can have a blank front panel or one equipped with three switches and three indicators
(the control equipped front panel is illustrated in Figure 2-9 - one indicator is not used). Table 2-5 lists
the switches and indicators and describes the function of each.

2-14

PDP11/03L
(BA11-Nt

BA11-N
EXPANDER
BOX

POWER IS CONTROLLED BY
THE AC INPUT BOX ON/OFF
SWITCH OR BY THE ON/OFF
SWITCH OF A REMOTE
SWITCHED SOURCE_

FROM
AUX ON/OFF SWITCH

PDP11/03L
(BA11-N)

J3
POWER
CONTROLLER

BA11-N
EXPANDER
BOX

POWER
CONTROLLER

PDP11/03L
(BA11-Nt

BA11-N
EXPANDER
BOX

POWER IS CONTROLLED BY
THE AUX ON/OFF SWITCH ON
THE PDP11/03L FRONT PANEL

POWER IS CONTROLLED BY
THE POWER CONTROLLER
ON/OFF SWITCH (OR BY AN
ON/OFF SWITCH AT SOME
EXTERNAL SOURCE)_

MA-0759

Figure 2-7

Power Connections, PDP-II j03L Systems

2-15

FROM
AUX ON/OFF SWITCH

PDP11/03
(BA11-Ml

POWER
CONTROLLER

BAll-M
EXPANDER BOX

POWER
CONTROLLER

BAll-M
EXPANDER BOX

PDPll/03L
(BA11-Nl

BA11-M
EXPANDER BOX

BA11-N
EXPANDER BOX

POWER IS CONTROLLED BY
THE AUX ON/OFF SWITCH ON
THE PDP11/03L FRONT PANEL_

POWER IS CONTROLLED BY
THE POWER CONTROLLER
ON/OFF SWITCH (OR BY AN
ON/OFF SWITCH AT SOME
EXTERNAL SOURCEl_

MA-0758

Figure 2-8

Power Connections with BAll-MExpander Boxes

(c__o_O_O__) magma fJ fJQ)
PWR OK RUN

RESTART

HALT

ON
AUX OFF

MA-0751

Figure 2-9 Front Panel Switches and Indicators

2.. 16

Table 2-5
Switch

BAU-N Front Panel Switches and Indicators

Indicator

Function
Can be used for any desired function (switch is
rated at 48 V, 1 A de). Two specific functions are:

AUXON/OFF

If the BAII-N is wired to control system power,
the A UX switch turns the power on and off; if the
BA 11-N is not wired to control system power, the
switch can control the LTC signal, disabling the
signal when the switch is in the OFF position.
In the down position, the HALT switch forces the
CPU to suspend normal program execution, enables console ODT microcode operation, and permits single-instruction execution. To resume
program execution, return the HALT switch to the
up position and enter a P command from the console terminal (providing the contents of register R 7·
were not changed; refer to Chapter 2 of the
1977-1978 Microcomputer Handbook for a description of console ODT command usage).

HALT

In an expander box, the HALT switch can be used
to light the RUN indicator.
When the momentary REST AR T switch is activated, the CPU automatically carries out a powerup sequence; thus, the CPU can be rebooted at any
time from the front panel.

RESTART

PWROK

The PWR OK indicator lights when the power supply dc voltages are present.

RUN

The RUN indicator lights when the CPU is executing programs.

In addition to the front panel switches and indicators, there is an ON/OFF switch and a primary
voltage selection switch, both on the ac input box. The ON/OFF switch remains in the ON position
when a power controller is used to apply primary power to the BAII-N; if a power controller is not
used, the switch can be used to turn power on and off. Refer to Paragraph 2.2.1.1 for information
about the primary voltage selection switch.

2-17

APPENDIX A
BACKPLANE AND MODULE CONFIGURATION

LSI-II systems can be classified as either single-backplane or multiple-backplane systems. The electrical characteristics of each system are quite different; hence, two sets of rules have been devised and
must be observed. These rules, which have their basis in bus loading and power consumption, are listed
here and are summarized in the backplane configuration charts that appear later in this appendix.

SINGLE-BACKPLANE CONFIGURATION RULES
1.

The LSI-II bus can support up to 20 ac loads, i.e., the processor has on-board termination
for one end of the bus; after 20 ac loads, the other end of the bus must be terminated with
120 Q.

The terminated bus can support up to 35 ac loads.

The bus can support up to 20 dc loads.

The amount of current drawn from each power supply should be 70 percent, or less, of the
maximum rated output of the supply (Paragraph 1.4).

MULTIPLE-BACKPLANE CONFIGURATION RULES
,

No more than three backplanes can be connected together.

Each backplane can have no more than 20 ac loads.

The total number of dc loads cannot be more than 20.

Both ends of the termination line must be terminated with 120 Q; i.e., the first backplane
must have an impedance of 120 Q, and the last backplane must have a termination of 120 Q.

The cable connecting the first two backplanes (i.e., the main box and expander box 1) must
be at least 61 cm (2 ft) long; a 183 cm (6 ft) length of cable is recommended for ease of
installation.

The cable connecting the backplane of expander box 1 to the backplane of expander box 2
must be at least 122 cm (4 ft) longer or shorter than the cable connecting the main box and
expander box 1; a 305 cm (10 ft) length of cable is recommended for ease of installation.

The combined length of both cables in a three-backplane system cannot exceed 488 cm (16
ft).

If the cables are customer-supplied, they must have a characteristic impedance of 120 Q.

The amount of current drawn from each power supply should be 70 percent, or less, of the
maximum rated output of the supply (Paragraph 1.4)

A-I

Backplane configuration charts are provided here to help the user observe these configuration rules.
First, one must determine which backplane configuration is best suited for a specific application. Use
the backplane selector charts, Figures A-I and A-2, to determine this configuration.
The selector charts show configurations that one might want to achieve when beginning with either a
PDP-I Ij03 or a PDP-I Ij03L. The backplanes are shown as vertical columns of quad-size module
positions; if the dashed lines are completed, double-size module positions are created. For example, if
you wish to insert a quad module in module positions 3 and·4 of the PDP-I Ij03 single backplane,
write in the option type without completing the dashed line. However, if you want to insert a double
module in position 3, complete the dashed line between positions 3 and 4 and write in the option type
in the space allotted to position 3.
The column layout of the backplanes makes it easy to establish interrupt and DMA priorities of the
modules; i.e., the closer to the top of a column a module is placed, the higher is the priority of the
module. Furthermore, the column layout easily depicts the correct placement of cable and termination
modules.
To configure an LSI-II system, take the following steps.
I.

Choose the type of memory (MOS, PROM, or combination) required for the specific application.

Select the CPU and memory combination most suited for the application (the PDP-Ilj03L
uses a KDll-R).

Select additional memory, interface, and peripheral options required.

Count the total number of module positions.

Count the total number of bus positions.

Choose a backplane configuration that satisfies the module position requirement, the bus
position requirement, and also provides sufficient expansion space.

Enter the option names in the backplane positions of the selected configuration.

Review the initial backplane configuration to determine if changes must be made.

Ifno changes are necessary, move to the appropriate backplane configuration chart (Figures
A-3 through A-8). Enter the option names and numbers, the ac and dc loads, the power
consumption, and the cable numbers (the Option Summary Chart, Table A-I, lists power
requirements and bus loads for the LSI-II modules). Total the power consumption and the
ac and dc loads. If any of these exceed the limits specified, the module configuration will
have to be altered or a new backplane configuration will have to be selected.

A-2

PDP11/03 (H92701
MODULE
POSITION
1
2
3
4

BUS
POSITION
1
2
3
4

6
7
8
9, 10
11,12
13,14
15, 16
17,18
19,20
21,22
23,24
25,26
27,28
29,30
31,32
33,34
35,36
37,3B
39,40
41,42
43,44

6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

SLOT
1AB
1CD
2CD
2AB
3AB
3CD
4CD
4AB
1ABCD
2ABCD
3ABCD
4ABCD
5ABCD
6ABCD
7ABCD
8ABCD
9ABCD
1ABCD
2ABCD
3ABCD
4ABCD
5ABCD
6ABCD
7ABCD
8ABCD
9ABCD

PDP11103
(H92701

BA11-N (H92731

(21 BA11-N (H92731

KD11CPU

1<011CPU

I-M9400_VE
M9401

M9400-YE M9401

KD11CPU

BDV11-A
TERMINATOR

PDP11/03 (H92701

L
I
BDV11-A

TERMINATOR

M9400-YD ~
M9401

BDV11-A

TERMINATOR

MA-0757

Figure A-I

MODULE
POSITION
1,2
3,4
5,6
7,8
9,10
11, 12
13,14
15,16
17,18
19,20
21,22
23,24
25,26
27,28
29,30
31,32
33,34
35,36
37,38
39,40
41,42
43,44
45,46
47,48
49,50
51,52
53,54

BUS
POSITION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

SLOT
1ABCD
2ABCD
3ABCD
4ABCD
5ABCD
6ABCD
7ABCD
8ABCD
9ABCD
1ABCD
2ABCD
3ABCD
4ABCD
5ABCD
6ABCD
7ABCD
8ABCD
9ABCD
1ABCD
2ABCD
3ABCD
4ABCD
5ABCD
6ABCD
7ABCD
8ABCD
9ABCD

Backplane Selector Chart, PDP-I 1/03 Expansion

PDP11/03L (H92731

PDP11/03L
(H92731
KD11-H CPU
MSV11-CD MEMORY
I
I

PDP11/03L (H92731
+
BA11-N (H92731
KD11-H CPU
MSV11-CD MEMORY

KD11-H CPU
MSV11-CD MEMORY

I
I

+
(21 BA11-N (H92731

BDV11-A

TERMINATOR

M9400-YE .1
M9401

M9400-YE
M9401

I
I

I
BDV11-A

TERMINATOR

M9400-YD
M9401

I
I

I
I
I

r
BDV11-A

TERMINATOR

MA-0732

Figure A-2

Backplane Selector Chart, PDP-II/03L Expansion
A-3

H9273
1
3
5
7
9
11
13
15
17

MODULE
POSITION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

KD11-H
MSV11-CD

2
4
6
8
10
12
14
16
18

BDV11-A

OPTION
NUMBER
M7264-YA

TYPE
KD11-H

•
•

PDP11/03L BOX

CURRENT(AMPS) BUS LOADS
+5V
+12V
DC
AC
1.6
0.25
3.3
1.0

MSV11-CD

M7955-YD

1.1

0.54

2.4

1.0

BOV11-A

M8012

1.25

0.05

1.6

1.0

2.6

15.5

8.0

35-

•

MODULE TOTALS
H9273
TOTAL
MAXIMUM AVAILABLE

CABLES

-IF THE BDV11-A (OR ANOTHER 120-0HM TERMINATOR) IS NOT IN THE
BACKPLANE, THE SYSTEM CAN SUPPORT ONL Y 20 AC LOADS.
MA-0760

Figure A-3

Configuration Chart, PDP-llj03L (H9273)

A-4

H9273
1
3
5
7
9
11
13
15

KD11-H
MSV11-CD

M9400-YE

(2) BC05L CA BLES

MODULE
POSITION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

s.-1

19
21
23
25
27
29
31
33

M9401

BDV11-A

H9273
20
22
24
26

t
M7955-YD

M9400·YE

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

36
CURRENT(AMPS)
+5V
+12V
1_6
0.25

BUS LOADS
AC
DC
3.3
1.0

0.54

2.4

1.0

0.29

(2) BC05L (NOTE 2)

2.6

PDP11/03L MAIN BOX

15.5

8.0

NOTE 1

BCV1B

M9401

BDV11-A

M8012

1.25

0.05

1.6

1.0

2.6

15.5

8.0

NOTE 1

•

MODULE TOTAL
·M9273
TOTAL
MAXIMUM AVAILABLE

CABLES

1.1

19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
36

BA11-N EXPANDER BOX

32
34

MSV11-CD

BCV1B

PDP11 103L MAIN BOX

28
30

OPTION
NUMBER
M7264-YA

TYPE
KD11-H

2
4
6
8
10
12
14
16
18

BA11·N EXPANDER BOX

NOTES:
1. THE TOTAL DC LOADS OF BOTH BOXES CANNOT EXCEED 20.
2. EACH BC05L CABLE MUST BE AT LEAST 61cm (2 FT.) LONG, BUT A 183cm (6 FT.) LENGTH IS RECOMMENDED.
MA-0730

Figure A-4

Configuration Chart. PDP-ll/03L (H9273) and BAII-N (H9273)

A-5

H9273
l-KDlI·H
3-MSYlI-CD
5
7
9
11
13
15
17 M9400·YE

2
4
6
8
10
12
14
18
18

PDP11/03L MAIN BOX

121 BC06L CABLES

H9273
19 M9401
21
23
25
27
29
31
33
35 M94OO·YD

20
22
24

MODULE
POSITION
1

.TYPE
KDll·H

,•

2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

1.1

0.54

2.4

1.0

acV1B

M9400·YE

029

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

BAl1·N EXPANDER BOX 1

19
20
21
22
23
24

BUS LOADS
AC
DC
1.0
3.3

M7955·YD

•,

CURRENT IAMPSI
+5V
+12V
1.6
0.25

MSVl1-CD

26
30

OPTION
NUMBER
M7284·YA

2.6

15.5

8.0

CABLES

.(2) ac06L (NOTE 2)

0
PDPlI/03L MAIN BO X
NOTE 1

acV1B

M9401

BCV1A

M9400-YD

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

2.6

15.5

8.0

NOTE 1

26
26
27
28
29

121 BC05L CABLES

H9273

37 M9401

39
41

43
45
47

49
51
53-BDVl1-A

38
40
42
44
46
48
50
52
54

31
32
33

34
35
36

121 BC05L INOTE 31

0
BAl1-N EXPANDER BOX 1

BAll·N EXPANDER BOX 2

37
38
39
40

acV1A

M9401

MB012

125

0.05

1.6

1.0

2.6

15.5

8.0

NOTE 1

41
NOTES:
1. THE TOTAL DC LOADS OF ALL BOXES CANNOT EXCEED 20.
2. THIS BC06L MUST BE AT LEAST 61cm 12 FT J LONG,
BUT A LENGTH OF 183cm 16 FT.) IS RECOMMENDED.
3. THIS CABLE MUST BE AT LEAST 122cm 14 FT.I LONGER
OR SHORTER THAN THE CABLE IN NOTE 2: A 3.05m
110 FT.I LENGTH IS RECOMMENDED.
4. THE COMBINED LENGTH OF BOTH BC05L CABLES
CANNOT EXCEED 48Bcm 116 FT.I.

42
43
44
45
46
47
48

49
50
51
52
53
54

BDVl1·A

•

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

BAll·N EXPANDER BOX2

MA-0770

Figure A-5 Configuration Chart,
PDP-II/03L (H9273)
and (2) BAII-N (H9273)

A-7

H9270

KD11·

BDV11·A

PDP11'03 BOX

MODULE
POSITION
1
2
3

TYPE
KD11

OPTION
NUMBER
M7264

CURRENT (AMPSI
+5V
+12V

•

BUS LOADS
AC
DC
1.0
3.3

CABLES

4
5
6
7

BDV11·A

MS012

•

MODULE TOTAL
H9270
TOTAL
MAXIMUM AVAILABLE

1.25

0.05

1.6

1.0

5.1

13.0

2.5

35*

PDP 11 '03 BOX

*IF THE BDV11·A (OR ANOTHER 120-OHM TERMINATORIIS NOT IN THE BACKPLANE,
THE SYSTEM CAN SUPPORT ONLY 20 AC LOADS.

MA·0733

Figure A-6 Configuration Chart, PDP-I 1/03 (H9270)

A-9

H9270
1
4
5
8

KD11·

2
3
6
7

M9400·YE

PDP11/03 MAIN BOX

(21 BC05L CAB L E S H9273
9
11
13
15
17
19
21
23
25
MODULE
POSITION
1
2
3
4
5
6
7
8

TYPE
KD"·

BDV11·A

(NOTE 11

OPTION
NUMBER
M7264

•
BCV1B

BA"·N EXPANDER BOX

CURRENT (AMPSI
+5V
+12V

BUS LOADS
AC
DC
1.0
3.3

CABLES

0.29

(2) BC05L (NOTE 31

5.1

PDP11/03 MAIN BOX

13.0

2.5

M9400·YE

MODULE TOTAL
H9270
TOTAL
MAXIMUM AVAILABLE
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

10
12
14
16
18
20
22
24
26

NOTE 2

BCV1B

M9401

BDV11·A

M8012

1.25

0.05

1.6

1.0

t
0

2.6

15.5

8.0

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

BA"·N EXPANDER BOX
NOTE 2

NOTES:
1. A TEV11 OR A REV1'·A DOUBLE MODULE IN POSITION 25 WILL ALSO TERMINATE THE LSI·11 BUS.
2. THE TOTAL DC LOADS OF BOTH BOXES CANNOT EXCEED 20.
3. THE BC05L CABLE MUST BE AT LEAST 61em (2 FT.I LONG, BUT A 183em (6 FT.I LENGTH IS RECOMMENDED.
MA-0728

Figure A-7

Configuration Chart, PDP-I 1/03 (H9270) and BAII-N (H9273)

A-tO

H9270
1
4
5
8

KD11-

2
3
6
7

M9400-YE

PDP11/03 MAIN BOX

r--- (2) BC05L CABLES

MODULE
POSITION
1
2
3
4
5
6
7
8

TYPE
KD11-

OPTION
NUMBER
M7264

BCV1B

M94Q.O-YE

MODULE TOTAL
H9270
TOTAL
MAXIMUM AVAILABLE

CURRENT(AMPS) . BUS LOADS
+5V
+12V
AC
DC
3_3
1.0

0.29

5.1

13.0

2.5

CABLES

(2) BC05L (NOTE 3)

PDP11/03 MAIN BOX
NOTE 2

H9273
9
11
13
15
17
19
21
23
25

M9401

10
12
14
16
18
20
22
24
26

M9400-YD

BA11-N EXPANDER BOX 1

~ (2) BC05L CABLES

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

BCV1B

M9401

BCV1A

M9400-YD

(2) BC05L (NOTE 4)

2.6

BA11·N EXPANDER BO X 1

15.5

8.0

. NOTE 2

MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE
H9273
27
29
31
33
35
37

M9401

28
32

27
28
29

31
32
33
34
35
36
37

39
41
43-BDV11-A

40
42
{NOTE 1)- - 4 4

BA11-N EXPANOER BOX 2

BCV1A

M9401

BDV11-A

M8012

1.25

0.05

1.6

1.0

2.6

15.5

8.0

38
39
40
41
42

43
44

t
+
MODULE TOTAL
H9273
TOTAL
MAXIMUM AVAILABLE

BA11·N EXPANDER BOX 2

NOTE 2

NOTES:
1. A TEV11 OR A REV11·A DOUBLE MODULE IN POSITION 43WILL ALSO TERMINATE THE LSI·11 BUS.
2. THE TOTAL DC LOADS OF ALL BOXES CANNOT EXCEED 20.
3. THIS CABLE MUST BE AT LEAST 61cm (2 FT.) LONG, BUT A LENGTH OF 183cm (6 FT.) IS RECOMMENDED.
4. THIS CABLE MUST BE AT LEAST 122cm (4 FT.) LONGER OR SHORTER THAN THE CABLE IN NOTE 3;
A 31cm (10 FT.) LENGTH IS RECOMMENDED.
5. THE COMBINED LENGTH OF BOTH BC05L CABLES CANNOT EXCEED 488cm (16 FT.).

MA-0729

Figure A-8 Configuration Chart,
PDP-l 1/03 (H9270)
and (2) BA ll-N (H9273)

A-ll

Table A-I
Option

Option Summary Chart
Amps (Typ)
+5V +12 V

Bus Loads
ac
dc

Size

Cables

2.0

Quad

BC04Z
BC04R
BCOSR Used
w/H322

0.45

3.3

Quad

BC04Z
BCOSR Used
w/H322

2 modules, 2 Cables
Used to Interconnect
4 X 4 Backplane, No
Terminators

0
0

Double
Double

(2) BC05L-XX
Included

M9400-YE
M9401

2 Modules, 2 Cables
Used to Interconnect
4 X ~4 Backplane, 250n
Terminators

0.29A 0
0
0

0
0

Double
Double

(2) BC05L-XX
Included

MSOl2

Terminator, Boot, and
DIagnostic

1.25

0.05*

1.6

Quad

...... -

9 X 6 Backplane

6.4

...... -

Type

Number

Description

AAVII-A

A6001

12 bit, 4-Channel D/A
Converter

1.5

ADVII-A

AOl2

I 2 bit, 16-Channel A/D
Converter

BCVIA-XX

M9400-YD
M9401

BCVIB-XX

BDVII-A

DDVII-B
DLVII

M7940

Serial Line Interface

1.0

0.18

2.6

Double

BC05M-X for
20 MA Loop
BC05C-X for
EIA

KWVII-A

M7952

Programmable
Real-Time Clock

1.75

0.01

3.5

Quad

BC04Z
BCOSR

LAVII

M7949

LA ISO Line Printer
Interface

0.50

1.9

Double

BCIIS-XX

LA ISO Line Printer
Interface

Double

...... -

4KX 16

2.S
0
Fully
Loaded

3.3

Double

........

LPVII

MRVII-A

M7942

PROM

*Increases if customer ROMs are installed.

A-13

Table A-I

Option Summary Chart (Cont)

Option
Type

Number

MRVII-B

M8021

Description
4K X 16
U/V PROM,
256 X 16 RAM

Amps (Typ)
+5 V +12 V

Bus Loads
ae
de

Size

Cables

0.62 0.5
Fully
Loaded --

2.8

Double

----

- - --

MSVII-B

M7944

4K X 16 MaS RAM

0.6

0.3

3.3

Double

- -- -

MSVII-CD

M7955-YD

16K X 16 MaS RAM

1.1

0.54

2.4

Quad

----

REVII-A

M9400-YA

Floppy Disk Boot,
DMA RAM Refresh,
120 n Terminator

1.6

2.2

Double

- - --

REVII-C

M9400-YC

Same as REVII-A
w/o Terminator

1.0

2.2

Double

-- - -

RXVII-B

M7946

Floppy Disk Interface

1.5
Max

1.8

Double

BC05L-X

TEVII

M9400-YB

120 n Bus Terminator

0.5

Double

-- - -

DRVII

M7941

Parallel Line Interface

0.9

2.8

Double

(2) BC07D-X
BCIIK-25

DRVII-B

M7950

DMA Interface

1.9

Quad

(2) BC04Z-X

DRVII-P

M7948

Bus Foundation Module

-1.0
Plus User Logic

Quad

__ ,. -

DUVII-DA

M7951

Synchronous Serial
Line Interface

0.86

0.32

1.3

Quad

BC05C-25

DZVII-A

M7957

Quad Asynchronous
Serial Line Interface

1.15

0.39

Quad

BCIIU-25

H9270

4 X 4 Backplane

5.1

----

H9273

9 X 4 Backplane

2.6

- - --

IEEE Instrument Bus
Interface

0.8

1.6

Double

BNIIA
Included

MSVII-D

IBVII-A

M7954

A-IS

Table A-I
Option

Amps (Typ)
+5 V +12 V

Bus Loads
ac
dc

Size

Cables

LSJ-I I CPU with
4K X 16 MOS RAM

1.8

0.8

3.3

Quad

----

LSI-II CPU w/o RAM

1.6

0.25

3.3

--- -

LSI-II CPU w/o RAM

Double

- ---

M7264-YA
M7955-YD

LSI-II CPU with
16K X 16 MOS RAM

1.6
1.1

0.25
0.54

3.3
2.4

I
I

Quad
Quad

-- --

M8016

Power Fail/Restore
Signal Sequencer,
Line Time Clock and
120 n Terminator

0.011

0.082

3.3

Double

----

Type

Number

Description

KDII-F

M7264

KDII-H

M7264-YA

KDII-HA
KDII-R

KPVII-8

Option Summary Chart (Cont)

A-17

----

Reader's Comments

BAll-N MOUNTING BOX
USER'S GUIDE
EK-BAIIN-UG-OOI

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