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Document:	H720 Power Supply and Mounting Box User's Manual
Order Number:	EK-H720-OP
Revision:	001
Pages:	38
Original Filename:

OCR Text

H720

power supply and
mounting box
user's manual

dlifgliltiall

EK-H720-OP-001

H720

power supply and
mounting box
user's manual

digital equipment corporation « maynard, massachusetts

1st Edition, September 1976

Copyright © 1976 by Digital Equipment Corporation
The material in this manual is for informational
purposes and is subject to change without notice.

Digital Equipment Corpdration assumes no respon-

sibility for any errors which may appear in this
manual.
Printed in U.S.A.

- The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:

DEC
DECCOMM
DECsystem-10
DECSYSTEM-20

DECtape

PDP

DECUS

RSTS

DIGITAL
MASSBUS

TYPESET-8
TYPESET-11
UNIBUS

CONTENTS
Page

CHAPTER 1

INTRODUCTION

CHAPTER 2

POWER SUPPLY

2.1

INTRODUCTION

2.2

GENERAL DESCRIPTION

. . . .

2.2.1

AC Power Distribution

2.2.2

Unregulated DCSupply

CHAPTER 3

e e e e e e

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2-1

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. . . ... ... o

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2-2

MOUNTING BOX

3.1

SCOPE . . o o o e e e e e

3.2

DESCRIPTION

3.3

MODELS

CHAPTER 4

INSTALLATION

3-1

e e, .

3-1

e e,

3-1

. .« . o oo v e e

. .« o o o

4.1

INTRODUCTION

4.2

SYSTEM CONFIGURATIONS

4.3

INSTALLATIONPLANNING

4.3.1

Space Requirements

. . . . .

et e e e s

e e e

. . ... .. ...

. ... ...

. .. ...

.. ...

. . . . . . ... ... ... .. .. .

4.3.2

Environmental Requirements

4.3.3

Power Requirements

. . . . . ... .. .. e

e e e e

Cable Requirements

. . . . .. ... ... e

e e e e e e e

434

241

e e e e e e e e e

4.4

INSTALLATION

4.5

DATA SHEETS

. . . ... ...
.e e

. . ... .. e

e e e e e e

. . . . . .

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e e
e

e e e

e e e
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...........

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4-1

4-1
4.3
4.3
4-3

44
44

4.5

ILLUSTRATIONS
Title

Figure No.
3.1

Basic Mounting Box

4-1

PDP-11 Position Assignments

. . . . .. e

e e e e e e e

. . .. . .. ...
.. e

TABLES

- Title

Table No.
2-1

H720 Power Supply Models

3.1

Mounting Box Models

4-1

PDP-11 System Configurations

- Page

. . . ... ... ... ...... L

. . . . . .. . ... .. o000
. . . . . ... ... ... ... . ...

iii

.43

CHAPTER
1

This manual provides the user with information on the PDP-11 Power Supply and Mounting Box; their system
configurations and installation procedures.

The H720 Power Supply is described briefly in Chapter 2.

NOTE
|
Sections of this manual refer to specific engineering drawings
which are contained in the second volume entitled /720 Power
Supply and Mounting Box, Engineering Drawings. The drawings in the above manual reflect the latest print revisions.

Chapter 3 comprises descriptions of the modular concept of the PDP-11 System and the four available mounting
box models.

Installation procedures are covered in Chapter 4, which describes all applicable PDP-11 System configurations
and planning requirements. The remainder of the chapter contains a series of data sheets on the six basic system

configurations and the major hardware components, including a brief description of the item, specifications, and

installation drawings.

1-1

CHAPTER 2
POWER SUPPLY

2.1 INTRODUCTION

The H720 Power Supply provides both regulated and unregulated ac and dc power for the PDP-11 System. This
supply furnishes all power required by components mounted in either a basic or extension mounting box.
The physical dimensions and electrical specifications of the H720 Power Supply are given in the appropriate data

sheet in Chapter 4 of this manual.

2.2 GENERAL DESCRIPTION
The H720 Power Supply provides both regulated and unregulated ac and dc power for the PDP-11 System. There
are two basic versions of the power supply and two models of each version, as shown in Table 2-1.

Table 2-1
H720 Power Supply Models

Version |

A&B
C&D

Model No.

Remarks

H720-A

Models A and B are identical except for input voltage

H720-B

requirements.

H720-C

Models C and D are door-mounted versions of models

H720-D

A, B, E, or F. A metal frame accepts the entire power

supply for use with some peripheral controllers.

E&F
-

H720-E

Models E and F are identical except for input voltage

H720-F

requirements. Ac control and increased +5V current

capabilities distinguish these models from the A and

B models.

The H720 Power Supply, designed to mount in the BA11 Mounting Box, furnishes all power required by com-

ponents in either a basic or extension mounting box. The input voltage may be either 120V or 240V at 50/60 Hz.
Regulated outputs of +5V at 16 amps (A and B version), or at 22 amps (E and F version), and -15V at 10 amps
(both versions) are available.

2-1

Unregulated outputs of +8V at 1.5 amps and -25V at 1.5 amps are also available. In addition, a sine wave clipped
both at ground and +5V (nominal) is provided for the line clock, and a pair of logic levels (AC LO and DC LO)
are provided to warn the processor of imminent power failure.

Switching mode regulation, employed in the +5V and -15V supplies, offers the advantages of compactness and
high efficiency over an analog-type regulator at the expense of a slightly greater circuit complexity. Dynamic
over- and under-voltage protection and current-limiting are implemented on the two regulated voltages.

2.2.1 AC Power Distribution

Incoming ac power is applied through fuse F1 of the H720 Power Supply, and then routed above the fans to the
OFF/POWER/PANEL LOCK switch on the front panel. (Both ac lines connect to this switch.) Power is then

routed to the back of the supply where two accessory outlets are provided, and is then applied through fuse F2

to the primary winding of the power transformer. A split primary with jumpflers'is used to allow operation at
either 120V or 240 Vac. One‘pair of fans is connected across each primary winding to ensure that the fans always
receive 120 Vac.

Models E and F of the H720 have four features in the ac control section that distinguish them from the A and B
models. These features are:

The incoming ac line uses a circuit breaker rather than a fuse.

The control portion permits switchable remote and local control to provide the capability of

The POWER switch on the front panel of the computer switches only a single ground control
line to activate the ac input, rather than switching both sides of the ac line as in the A and B

one unit controlling several others (see the schematic of the control portion).

version.

A thermal detector is used to turn off the supply in the event of excessive temperature.

The remainder of the ac portion of the E and F versions is essentially the same.as that of the A and B versions.

2.2.2 Unregulated DC Supply

The basic £25 Vdc are developed from a pair of full-wave bridge rectifier circuits connected to the center-tap of

the secondary winding of the power transformer. A 22,000 uF capacitor on each dc voltage leg provides filtering.
In addition, there is a pair of taps (approximately 8V rms) on either side of the center tap. This voltage is full-

wave rectified but unfiltered, and provides power for the console indicator lamps.

2-2

CHAPTER 3
MOUNTING BOX

3.1

SCOPE

The PDP-11 System is modular in concept and consists of a number of basic building blocks, known as system
\\.‘——V'/

units, that are housed in a mounting box. This section discusses only the basic PDP-11 Mounting Box. A

description of system units and cables is included in the maintenance manuals and handbooks for the specific
PDP-11 system involved. Various methods of installing mounting boxes and descriptions of various system con-

figurations are presented in Chapter 4 of this manual.

3.2 DESCRIPTION
The basic mounting box (see Figure 3-1) is designed to house the system units that make up a PDP-11 System.

The box also includes a space for mounting the H720 System Power Supply. The mounting box contains four
fans for forced air cooling, an insulated top cover to prevent debris from falling into the wire-wrap pins (necessary
because the system units are mounted with the pins up and the modules down), and a foam-lined bottom cover

which is both a module retainer and minimizes module vibration. The bottom cover also serves as part of the air
plenum to ensure adequate cooling. The mounting box is fabricated from zinc-plated steel to resist corrosion; its

dimensions are given in drawing D-UA-11/20-0-0.
3.3 MODELS
There are four models of mounting boxes, each a variation of the box described above. The prime differences
among the four models are the type of front panel used and the mounting hardware.

The basic box is used to house the PDP-11 basic system and includes either a programfner’s console or controller
console as the front panel. The basic box may be supplied with either slides for rack-mounting or a table-top
decorative cabinet.

The extension box is used to house additional system components (expanded memory, interface modules, etc.)
and includes a blank front panel rather than a console. It also may be supplied with either tilt-slides or a table-top
COVCr.

The four mounting box models are listed in Table 3-1.

3-1

Figure 3-1

Basic Mounting Box

Table 3-1

Mounting Box Models

Model No.

Type of Box

Front Panel

Mounting Hardware |

BA11-CS

Basic

Console

Tilt-slides for rack mounting

BA11-CC

Basic

Console

Table-top decorative cabinet

BA11-ES
BA11-EC

Extension
Extension

Blank
Blank

Tilt-slides for rack mounting
Table-top decorative cabinet

NOTE: Model number code indicates:

-CS

Type

-~ \Type of

of Box

Mounting

CHAPTER 4

INSTALLATION

4.1 INTRODUCTION

This chapter provides installation information and physical specifications for PDP-11 Systems. Because of the
number of possible system configurations, a brief description of all PDP-11 Models is included. Subsequent

paragraphs discuss requirements that must be considered for installation planning and the appropriate installation
and
- procedures. The final portion of this chapter includes a series of data sheets that eontain specifications
drawings on major hardware components.

4.2 SYSTEM CONFIGURATIONS

Basic PDP-11 Systems are available in 18 different configurations. Configurations differ in mounting methods,
input power requirements, inclusion of a Teletype®, and support functions supplied. Six of these configurations

represent standard systems, the remaining twelve represent systems designed for use by OEM’s. All 18 configurations are briefly mentioned in Table 4-1; however, only the six standard configurations are described in detail in
Paragraph 4.5. The OEM configurations are physically identical to the standard, with the following exceptions:
a.

The Teletype and front panel logo are optional.

Support functions (i.e., one set of documentation per system, training courses, maintenance)
-

are not included.

In addition to the basic system, customers can order DEC eptions and peripherals. Figure 4-1 shows a_standard. :
DEC cabinet and indicates preferred position assignments. These assignments have been chosen considering ease "

of control and cable lengths. Any PDP-11 equipment not shown on the drawmg may be mounted as desnedin

the remainder of the cabinet or in other cabinets. Note that the top and bottom cabinet spaces are not used the
top space is too high for easy access, and the bottom space does not allow the drawer to be tilted
4.3 INSTALLATION PLANNING

This section provides electrical, physical, and environmental requirements that must be considered pl'lOI‘ to
installationin order to ensure an efficient PDP-11 Computer installation.

®Teletype is the registered trademark of Teletype Corporation
4-1

Table 4-1
PDP-11 System Configurations
Configuration Codes

Basic

System

With

OEM

System

Teletype

With

Without

Teletype

" H

Mounting Method

Rack-mountable, with tilt-slides
|

Table-top model with cover
Rack-mounted in cabinet

Power Codes

Designation

- (Power Supply Type)

Input Power Requirements

115V, 50/60 Hz

B
NOTES:

230V, 50/60 Hz

1. Model codes are used as follows:
Configuration
|

Code

Computer
Model

__
2. Examples are:

/Power Supply Code

PDP-11/20-BA*"
PDP-11/20-BA is basic system with Teletype, table-top model, 115V version
- PDP-11/20-HB

OEM

230V version

4-2

System,

without

Teletype,

rack-mountable,

/’
““

4.3.1 Space Requirements

Access space must be provided at the installation site to accommodate the PDP-11 System and related peripherals.
Space must be adequate to allow access to all doors and panels for maintenance.
The PDP-11 System is available in rack-mountable, table-top, or
cabinet-mounted configurations. Dimensions for each configuration, including drawings, are given in the data sheets in Paragraph
4.5. If customer-supplied cabinets are to be used, the customer

should consult the supplier’s documents to ensure that sufficient
space is allowed for the cabinets.

The minimum service clearance on all standard DEC computef
cabinets is 8-3/4 in. at the front and 14-7/8 in. at the back.
The Teletype dimensions and service area requirements are

PC 11

also given in the appropriate data sheets in Paragraph 4.5 Because

READER/PUNCH

of the Teletype signal cable, the Teletype must be located within
eight ft of the computer.

PDP—11
BASIC MOUNTING BOX
(INCLUDING CONTROL CONSOLE)

4.3.2 Environmental Requirements
TABLE (OPTIONAL)

Ambient temperature at the installation site can vary between

50° F and 122° F (10° C and 50° oC).
To extend the life ex, .

AR
POP 11

pectancy of the system, however, it is recommended that the

EXTENSION MOUNTING BOX

temperature at the installation site be maintained between 70° F
and 85°F (20° C and 30° C).
All exposed surfaces of DEC cabinets and hardware have been
treated to prevent corrosion, but exposure of systems to ex-

treme humidity for long periods of time should be avoided.

H-0n3

The system operating environment should be within the

relative humidity range of 20% to 95% (non-condensing).

Figure 4-1
PDP-11 Position Assignments

4.3.3 Power Requirements

Systems with an A power code in the model designation (indicating an H720-A Power Supply) require a source of
115V (+10%), 50/60 Hz (47 to 63 Hz), single-phase power capable of supplying at least 8A (6A for the computer,
2A for the Teletype). Power dissipation is 400W for the computer and 150W for the Teletype. If additional
mounting boxes and power supplies are added to the basic system, additional power receptacles at the site are
required.

A standard 15-ft, 3-prong, U-ground, 15-A power cord is provided on the rear of the PDP-11 System for connection to the power source. The Teletype unit plugs into the rear of the PDP-11 Mounting Box and does not require
a separate receptacle.

All free-standing cabinets require an independent 115V receptacle to provide power for the cabinet fans.

Systems with a B power code in the model designation (indicating an H720-B Power Supply) require a source of
230V (x10%), 50/60 Hz (47 to 63 Hz), single-phase power capable of supplying at least SA (3A for the computer,
2A for the Teletype). If additional mounting boxes and power supplies are added to the basic system, additional
power receptacles at the site are required.

4-3

A standard 15-ft, 3-conductor power cable with pigtails is provided on the rear of the PDP-11 System for connection to the power source. The Teletype unit plugs into the rear of the mounting box.

All free-standing cabinets require an independent 230V receptacle to provide power for the cabinet fans.

4.3.4 Cable Requirements

Whenever an extension mounting box is used, an external Unibus Cable (BC11) is the only signal connection required between mounting boxes. This external Unibus cable may also be used to connect other peripherals to

the PDP-11 System. The BC11 Cable Assembly may be purchased in various lengths but the maximum combined
(internal and external) Unibus cable length is limited to 50 ft.

The length of the Teletype signal cable is such that it restricts the location of the Teletype to within eight ft of
the computer.

4.4 INSTALLATION
This paragraph covers installation of only the basic PDP-11 System. A section on installation of peripherals and
options is not required, because of the modulax and Unibus concepts of the system. To install a peripheral, for
example, it is necessary only to insert the system unit in the mounting box and connect a Unibus cable between
the mounting box and peripheral. Details of interface hardware are included in the Unibus Interface Manual.

Installation of a PDP-11 System requires no special tools or equipment. A fork-lift truck (or other pallet-handling
equipment) and normal hand tools should be available for receiving and installing the equipment.

The installation procedure is as follows:
Step

- Procedure

Remove the shipping straps with shears, remove the packing material, and remove
the cardboard crate to disassemble the wooden corner supports.

Carefully place the PDP-11 Mounting Box (or cabinet, depending on type of
system) in the desired location.

Open the Teletype carton and remove the packing material. Remove the back
cover from the stand. Remove and unwrap the copyholder, chad box, and
power pack. Remove the stand from the shipping carton. Remove the Teletype
console from the carton, holding it by means of the wooden pallet attached to

the bottom. Snap the power pack in place at the top of the rear side of the
Teletype stand.

Remove the Teletype console from the pallet and mount it on the stand.
Connect the Teletype console to the power pack.

(A 6-lead cable attached at

the console is connected to the power pack by means of a white plastic Molex

1375 female connector which mates with a male output plug on the power pack.)
Pass the 3-wire power cable and the 7-conductor signal cable (which is terminated
in a type W0O76 cable connector module) through the opening at the lower lefthand corner of the Teletype stand, then replace the back cover of the stand by
means of the two mounting screws.

Dress the Teletype cable under the PDP-11 Cabinet and through the large opening
at the right rear of the mounting box (the Unibus also passes through this opening).

Connect the cable to the 8-pin connector on the KL
1 1-A Teletype Control module.

(continued on next page)

4-4

Procedure

Step

Connect the 3-prong male connector of the Teletype power cable to either one of
the two 120V outlets at the rear of the mounting box.

Set the OFF/POWER/PANEL LOCK switch on the programmer’s console to the
POWER position.

Install a roll of printed paper into the Teletype Keyboard/Pnnter and mstall a

tape in the punch as describedin the PDP-11/20 System Manual.

-Set the Teletype LINE/OFF/LOCAL switch to LINE. Press the punch ON

pushbutton. Strike several keys and note whether or not the printer and punch
operate. Check operation of the printer with the LINE/OFF/LOCAL switch set
to LOCAL. After completion of these checks, set the switch to OFF.
10

Set the OFF/POWER/PANEL LOCK switch on the programmer’s console to

OFF. This completes the installation of a standard PDP-11 System. Before using
the system, verify system operating capability by performmg power supply checks
and running the complete set of diagnostic programs.

4.5 DATA SHEETS

The following data sheets contain information on the six basic PDP-11 System configurations,
as well as major
hardware components such as mounting boxes, Teletypes, power supplies, etc.

Each data sheetis devoted to a single item and includes a brief description, list of components, spemficatlons (dimensions and power), and installation drawings.

Data sheets are provided for the following:
a.

Models AA & AB Rack-Mountable Systems

Models BA & BB Table-Top Systems

Models CA & CB Rack-Mounted (cabinet) Systems

LT33 Teletype

LT35 Teletype

H720 Power Supply

BA11-EC Extension Mounting Box (Table-Top Model)

BA11-ES Extension Mounting Box (Rack-Mountable Model)

H952-HA Freestanding Programmer’s Table

H960-CA Freestanding Base Cabinet

NOTE

The BA11-CS and BA11-CC basic mounting boxes are included in items a. and b. above, respectively.

4-5

DESCRIPTION

Systems deéignated as either Model AA or AB are mounted in a basic mounting box which includes tilt-and-lock
chassis slides for cabinet installation. The mounting box is designed to fit either DEC cabinets or customer-

supplied standard 19-inch RETMA cabinets. The only difference between the two models is the input power
requirements.

COMPONENTS

Both models consists of a basic BA11-CS Mounting Box and either an H720-A (115V) or H720-B (230V) Power
Supply. The mounting box is supplied with the appropriate power supply already installed.
BA11-CS Mounting Box
Tilt-and-lock chassis slides
- Cooling fans (four)
Filter

11/20 Programmer’s Console or 11/10 Controller Console
H720 Power Supply

Power Supply (refer to power supply sheet for description of both A and B models)
15 ft of appropriate power cord with ground wire
SPECIFICATIONS

Size:

10-1/2 in. high, 19 in. wide, 23 in. deep

Weight:

90 Ibs. (approximate — includes processor, console, and 4K of memory)

Power:

H720-A — 120V * 10%, 47-63 Hz, 6A, single-phase

H720-B — 230V + 10%, 47-63 Hz, 3A, single-phase

4-6

MODELS AA and AB
)

|
\
RACK

.MOU

NTAB

SYSTE

10-1/72"

8—3/4"

\—\/4‘

Overall Dimensions

Y FRONT PANEL

Y CHASSIS

<
-3/4

E TQ OF SLIDE

‘

174"X 716"
SLOT TYP

19“

Rear View of Mounting Hardware
e

21.63 CHASSIS

l:————— 10.50 P.P
|

<188 —>
—r

—

- "’"44

\.25x1.00 SLOT

2400

}______________j _________________ [~
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63l © #- ?{___fi@

»l

:
S—

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s

o LY|

L-

“O CIQr
©
“L_,I?‘
24.88 EXTENSION

Side View of Mounting Hardware
4.7

:
l
o

|
|
|
: :
=,'Lv ’

DESCRIPTION

Systems designated as either Model BA or BB are mounted in a table-top mounting box which includes a
decorative, protective cover. The only difference between the two models is the input power requirements.
COMPONENTS

Both models consist of a BA11-CC Mounting Box and either an H720-A (115V) or H720-B (230V) Power Supply.
The appropriate power supply is furnished already installed in the mounting box.
BA11-CC Mounting Box
Protective cover

Cooling fans (four)
Filter

11/20 Programmer’s Console or 11/10 Controller Console
H720 Power Supply (See power supply sheet for description of both A and B models.)
15 ft of power cord with ground wire

SPECIFICATIONS

Size:

11 in. high, 20 in. wide, 23-5/8 in. deep

Weight:

100 lbs. (approximate — includes processor, console, and 4K of mefnory)

Power:

H720-A — 120V * 10%, 47-63 Hz, 6A, single-phase

H720-B — 230V + 10%, 47-63 Hz, 3A, single-phase

4-8

MODELS BA and
BB
TABLE-TOP SYSTEMS

DESCRIPTION

Systems desrgnated as either Model CA or CB are delivered to the customer already mountedin a DEC freestanding cabinet. In addition to the space occupied by the basic mounting box, the cabinet contains two addition-

al spaces for holding extension mounting boxes, basic mounting boxes, or other PDP-11 equipment. The only
difference between the two models is the input power requirements.

COMPONENTS
Both models consist of a BA11-CS Basic Mounting Box, an H960-CA Cabinet, and either an H720-A (115V) or
H720-B (230V) Power Supply. An optional freestanding programmer’s table may also be included.
BA11-CS Mounting Box

Tilt-and-lock chassis slides

Cooling fans (four)
:

Filter

11/20 Programmer s Console or 1 1/ 10 Controller Console

H720 Power Supply

Power Supply (refer to power supply sheet for description of both A and B models)
15 ft of appropriate power cord wrt_h ground wires

H960-CA Freestanding Base Cabinet

Fan assembly (in top of cabinet)
Power distribution panel
Extension feet
Front panel bezels (5 maximum)

H952-HA Freestanding Programmer’s Table (optional)
SPECIFICATIONS

Cabinet — 71-1/2 in. high, 22 in. wide, 39 in. deep
Table — 27 in. high, 19 in. wide, 20 in. extension from cabinet

Weight:

150 lbs (approximate — cabinet only — does not include mounting box or optional table)

Power:

Either 115V, 60 Hz or 230V, 50 Hz power required for fan assembly

PNV

Size:

4-10

MODELS CA and CB

RACK-MOUNTED (CABINET) SYSTEMS

20"

103

EXTENSION BOX

RESERVED FOR
PC—11
1

(HIGH-SPEED READER)

)

71-2-

CONSOLE

AND

BASIC MOUNTING BOX

(INCLUDES CP, MEMORY,ETC) |~

)
TABLE (OPTIONAL

RESERVED
FOR
EXTENSION

MOUNTING BOX

26.75"

;
»

—Y FLOORLINE

RACK MOUNTED SYSTEM
1I1-0096

4-11

DESCRIPTION

The LT33 Teletype Unit is one of the Téletypes that may be used with the PDP-11 System. This Teletype
functions as an input/output device for communication with the system. The Teletype unit plugs into the rear of
the PDP-11 System Mounting Box and therefore does not require a separate power receptacle.

MODEL TYPES

The LT33 Teletype is available in four models. The first letter of the model number indicates whether or not it
has a paper tape capability. The second letter of the model number indicates the required input voltage.

Model

Type

Power

LT33-DC

33 ASR

115V, 60 Hz

Description

Automatic send/receive unit. Includes keyboard and a

- reader/punch for paper tapes.
LT33-DD

33 ASR

230V, 50 Hz

Same as above.

LT33-CC

33 KSR

115V, 60 Hz

Keyboard only. Does not include paper tape capability.

LT33-CD

33 KSR

230V, 5S0Hz

Same as above.

SPECIFICATIONS

Size:

34 in. high, 22 in. wide, 19 in. deep

Weight:

56 1bs

Power:

C Models — 115V £ 10%, 60 Hz + 0.45 Hz

D Models — 230V %= 10%, S0 Hz £ 0.75 Hz
Both Models — Line current-drain of 2A power dissipation of 150W

4-12

LT33 TELETYPE

|
—

TELETYPE

UNIT

(MODEL C OR D)

NOTE:
MUST BE WITHIN

8 ft. OF PDP-11

SYSTEM DUE TO CABLE
RESTRICTION.
SERVICE
AREA

)

—r——————————

22"

TOP VIEW
11-0095

DESCRIPTION
The LT35 Teletype Unit is one of the Teletypes that may be used with the PDP-11 System. This Teletype
functions as an input/output device for communication with the system and is basically a heavy-duty version of
the LT33 Teletype. The unit plugs into the rear of the PDP-11 System Mounting Box and therefore does not
require a separate power receptacle.

MODEL TYPES

The LT35 Teletype is available in four models. The first letter of the model number indicates whether or not it

has a paper tape capability. The second letter of the model number indicates the required input voltage.

Model |

Type

Power

Description

1.T35-DC

35 ASR

115V, 60 Hz

Automatic send/receive unit. Includes keyboard and a
reader/punch for paper tapes.

LT35-DD

35 ASR

230V, 50 Hz

Same as above.

LT35-CC

35 KSR

115V, 60 Hz

Keyboard only. Does not include paper tape capability.

LT35CD

35KSR

230V, S0 Hz

Same as above.

SPECIFICATIONS
Size:

40 in. high, 20 in. wide, 28 in. deep

Weighi:

150 1bs-

Power:

C Models — 115V + 10%, 60 Hz + 0.45 Hz

D Models — 230V = 10%, 50 Hz £ 0.75 Hz
Both Models — Line current drain of 2A power dissipation of 150W

4-14

—

_.lrn_ mA z mSWT FP_W,Ao _
LT35 TELETYPE

11-0094

4-15

H720 POWER SUPPLY

(A and B Version)

DESCRIPTION
The H720 Power Supply provides both regulated and unregulated ac and dc power for the PDP-11 System. This
supply furnishes all power required by components in either a basic or extension mounting box. The power
supply is furnished as part of the basic mounting box, but must be ordered as an additional item when using
either the BA11-ES or BA11-EC Extension Mounting Box.

INPUT VOLTAGE

Model A:

120 Vac, £ 10%; 47-63 Hz; 6A

Model B:

One of the following:

218 Vac, £ 10%; 47-63 Hz; 3A
225 Vac, £ 10%; 47-63 Hz; 3A

233 Vac, + 10%;47-63 Hz; 3A
240 Vac, £ 10%; 47-63 Hz; 3A

OUTPUT VOLTAGES (both models)
Regulated:

+5 Vdc, = 5%; 16A

-15 Vdc, £ 3%; 10A
Unregulated:

222 Vde, £ 20%: 1A
+8V, full-wave rectified, unfiltered; 1.5A

PROTECTION CIRCUITS
Over-current:

+5V @ 18-22A; short-circuit current 30A at OV

-15V @ 12-16A; short-circuit current 25A at OV
Over-Voltage:

+5 Vdc limited to 6.3 Vdc

-15 Vdc limited to unregulated -22 Vdc
LOGIC SIGNALS
LTC:

Line frequency signal, sine wave clipped at +5V and ground

DC LO:

Low dc voltage signal, goes high before AC LO on power up;
remains high 7 ms after AC LO drops during power down

AC LO:

Low ac voltage signal

AVAILABLE POWER

The basic PDP-11/20, consisting of the KA11, KY11-A, MM11-E, and KL11, allows the following power for
expansion:
+5 Vdc, + 5%:;

3.4A

-15 Vdc, * 3%;

1.7A

-22 Vdc, = 20%, unregulated;

0.8A

DIMENSIONS

Size:

8 in. high, 16-1/2 in. wide, 6 in. deep

Weight:

25 Ibs

416

H720 POWER SUPPLY
(E and F Version)

INPUT VOLTAGE

"Model E:

120 Vac, * 10%; 47-63 Hz; 6A

Model F:

One of the following:

210 Vac, = 10%; 47-63 Hz; 3A
225 Vac, £ 10%; 47-63 Hz; 3A
240 Vac, £ 10%; 47-63 Hz; 3A
OUTPUT VOLTAGES (both models)

Regulated:

+5 Vdc, * 5%; 22A

-15 Vdc, = 3%; 10A
Unregulated:

22 Vdc, £ 20%; 1A
+8YV, full-wave rectified, unfiltered; 1.5A

PROTECTION CIRCUITS
Over-current:

Over-Voltage:

-15V @ 12-16A; short-circuit current 25A at OV

" +5 Vdc limited to 6.3 Vdc
-15 Vdc limited to unregulated -22 Vdc

LOGIC SIGNALS

LTC:

DC LO:

Line frequency signal, sine wave clipped at +5V and ground

Low dc voltage signal, goes high before AC LO on power up;
remains high 7 ms.after AC LO drops during power down

AC LO:

Low ac voltage signal

AVAILABLE POWER

The basic PDP-11/20, consisting of the KA11, KY11-A, MMI11-E, and KL11, allows the following power for*‘l- s
expansion:
+5 Vdc, * 5%;

9.4A

-15 Vdc, * 3%;

1.7A

-22 Vdc, * 20%, unregulated;

0.8A

DIMENSIONS

Size:

8 in. high, 16-1/2 in. wide, 6 in. deep

Weight:

30 Ibs

4-17

H960-CA

FREESTANDING BASE CABINET

DESCRIPTION

This optional cabinet can be used to mount the BA11-CS Basic Mounting Box and a BA11-ES Extension Mount~ ing Box, in addition to other PDP-11 equipment. If desired, the cabinet can be used to house only additional

PDP-11 equipment. The cabinet contains six 10-1/2 in. high mounting spaces. If equipment is not mounted,
each space can be covered by a black plastic panel. Five of these panels are supplied with the cabinet.
A photograph and installation drawing of this cabinet is contained in the Model CA and CB Rack-Mounted
-

System data sheet.
COMPONENTS
H950-A Frame

H952-E Coasters

H952-F Levelers

H952-C Fan Assembly (located in top of cabinet)
H950-S Filter

H950-B Rear Door

H952-A End Panel (2)

H950-D Mounting Panel Doors
H952-B Stabilizer Feet

PDP-11 Logo

Blank Plastic Bezels (10-1/2 in., maximum of 5 supplied)

Kick Plate

#7406782

Power Distribution Panel (ac and dc; mounted on upper left side of cabinet)

#7005909

SPECIFICATIONS

Size:

71-1/2 in. high, 22 in. wide, 39 in. deep (including stabilizer feet)

Weight:

150 1bs. (without any equipment mounted inside)

Power:

Either 115V, 60 Hz or 230V, 50 Hz power is required for the fan assembly

4-18

H952-HA

FREESTANDING PROGRAMMER'’S TABLE

DESCRIPTION

The H952-HA Freestanding Programmer’s Table is an option that can be ordered for use with the H960-CA Base
Cabinet. The table extends into the cabinet approximately one in. The surface plate is supported by its own

adjustable-height legs. It should be noted that the table cannot be used by itself; it must be used with the base
cabinet. During installation planning, it is necessary to note that the table extends 20 in. from the front of the
cabinet, making the space needed for the cabinet 59 in. deep.
SPECIFICATIONS

Size:

27 in. high (above floor)

19 in. wide

21 in. deep (extends 20 in. from cabinet, 1 in. into cabinet)

4-19

BA11-EC

EXTENSION MOUNTING BOX
(TABLE-TOP MODEL)

DESCRIPTION

The Table-Top Extension Box provides mounting space for up to six additional system units which cannot be
contained in the basic mounting box.

COMPONENTS

Each BA11-EC Extension Mounting Box is supplied with the following:
Blank front panel
Protective cover

Cooling fans (4)
Filter

Unibus cable from basic mounting box (8 ft 6 in. long)

15 ft of power cord with ground wire (type of cord determined by type of H720 Power Supply selected)
SPECIFICATIONS

Size:

11 in. high, 20 in. wide, 24 in. deep

Power:

Input power requirements are dependent on the type of H720 Power Supply ordered for
the box.

4-20

BA11-ES

EXTENSION MOUNTING BOX

(RACK-MOUNTABLE MODEL)

DESCRIPTION

The Rack-Mountable Extension Box provides mounting space for up to six additional system units which cannot
be contained in the basic mounting box.
COMPONENTS

|
|

| Each BA11-ES Extension Mounting Box is supplied with the following:
Blank front panel

Tilt-and-lock chassis slides
Cooling fans (4)
Filter

Unibus cable from basic mounting box (8 ft 6 in. long)

15 ft of power cord with ground wire (type of cord determined by type of H720 Power Supply selected)
SPECIFICATIONS

Size:

10-1/2 in. high, 19 in. wide, 23 in. deep

Power:

Input power requlrements are dependent on the type of H720 Power Supply ordered
for the box.

4-21

PDP-11 H720 POWER SUPPLY AND

MOUNTING BOX USER’S MANUAL

) EK-H720-OP-001

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