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RAYTH 





M 



The Raytheon 520 System provides the most powerful and 
useful input/output capability available in machines of its 
class. Input, output, and computing can occur simultane¬ 
ously. Maximumj input-output character rate is four million 
characters per second; word rate is 1MC. 

The Raytheon 520 input/output system consists of the fol¬ 
lowing basic components: 

1. The peripheral device controller 

2. The peripheral device 

3. The bus system of communication 

4. The 520 input/output control section 

A peripheral device communicates with the 520 through a 
peripheral device controller. Each peripheral device has its 
own controller which is connected to the input/output sys¬ 
tem. This method lends itself to economy in that the user 
need only order what he must have for his particular 520 
system configuration. This also provides ease of system 
expansion and replacement when more advanced periph¬ 
erals are available. 

The peripheral device controller will respond to computer 
control commands, will accept and provide synchronizing 
signals required by the 520 System and the device, will pro¬ 
vide word or character buffering with error detection, and 
will provide any voltage level and impedance matching 
required. The peripheral device controller frees the com¬ 
puter from constantly checking an input/output operation 


and indicates to the 520 when any transfer of data should 
take place. 

The input/output bus system consists of three cables con¬ 
nected serially to every peripheral device controller in a 
520 System configuration. The input bus can transmit 25 
bits of data or status information to the 520 from any 
peripheral device controller. The output bus has 25 bits of 
data transmission capability and can transmit either data 
or peripheral device select information from the 520 to any 
peripheral device controller. The control bus will transmit 
the control signals generated in the communications 
between the 520 and any peripheral device controller. Com¬ 
munication over the bus system is accomplished with 
current mode signal transmission, providing greater noise 
rejection and faster signal switching. 

Ease of programming has been attained by the use of only 
two input or output commands and a four-state com¬ 
mutator. The two commands are SELECT and DATA 
TRANSFER. The SELECT command will put the desired 
peripheral device controller on-line with’the 520. A periph¬ 
eral device controller must be on-line before anything other 
than a status response can be accomplished. The DATA 
TRANSFER command will result in the transfer of data 
to or from the 520, will send a status response to the 520 
from the selected peripheral device controller, or will cause 
the selected peripheral device controller to go off-line. The 
commutator is a two-bit binary counter which steps at the 
clock rate or can be locked to a particular state. The com¬ 
mutator is used to synchronize the transmission of data 
over the input/output bus by many peripheral devices. 




























The Keyboard/Display Station is a valuable tool for on line 
program debugging. Programs are displayed on the Key¬ 
board/Display Station with mnemonic and location in a 
format identical to the programmer's coding sheet, a 
“page" of coding at a time. 

The editing features of the Keyboard/Display Station are 
used to make corrections to the program. The programmer 
may “thumb through the pages" of his program stored in 
memory just as he can thumb through his coding sheets. 

In a data acquisition system, the Keyboard/Display Station 
may also be used for “quick-look" display of test data or 
results, as the test progresses. The ability to address loca¬ 
tions on the Keyboard/Display Station screen by the com¬ 
puter permits the output of only the changing information 
by the computer at a 25 /“sec. per character rate rather than 
requiring a complete “page" of information for each change 
which would require 15 milliseconds. 

This light demand on computer time permits a continuous 
presentation of important test parameters as they change. 

SPECIFICATIONS: 

Standard Format:.13 lines, 40 characters/line 

Standard Programming 

Character Repertoire:.64 characters 

(Special Character Sets Available at Extra Cost) 
Typical Character Size:. . . 0.17 inches high and 0.14 inches 

wide (can be modified to 
meet customer requirements). 
Display Area on Cathode Ray Tube:. 6 V 2 " by 8 V 2 " 


KEYBOARD/DISPLAY 

STATION 

519766 


The Line Printer is an electro-mechanical device for print¬ 
ing data at a high rate of speed. This device is a solid state, 
self-contained unit which has a full line width buffer, power 
electronics, and control logic for on-line operation. Opera¬ 
tion is fully automatic during programmed printing; how¬ 
ever, operator controls are provided for adjusting and 
positioning paper tension and print. The line printer is 
designed for edge perforated fanfold paper in multiple car¬ 
bons or pressure paper. The controller for the line printer 
is part of the basic I/O chassis in the main frame of the 520. 


SPECIFICATIONS: 

Printing Speed.300, 600, or 1250 lines per minute 

Line Width.. .80, 120, 132, or 160 columns 

Characters per column.64 

Line Format 

Horizontal . ..10 columns per inch 

Vertical ....6 lines per inch 

Printer Size.56" long x 30%" wide x 57" high 

Power Requirements.115 VAC, 60 cycle, single phase 

or 208VAC, 60 cycle, 3 phase, 4 wire or 
230VAC, 60 cycle, single phase, 3 wire 































MAGNETIC 

TAPE 

CONTROLLER 

517615 


MASTER 

TAPE 

TRANSPORT 

516635 



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The Magnetic Tape Controller con¬ 
sists of a cabinet with the magnetic 
tape controller logic chassis, power 
supplies, and a power sequencer. The 
controller will respond to all com¬ 
mands from the 520 (SELECT, DATA 
TRANSFER, DISCONNECT, etc.) 
and can control up to four transports. 
The controller will generate and 
respond to control signals necessary to 
transport operation (motion control, 
load point, read clock, etc.). The word 
format (1, 2, 3, or 4 characters per 
word) is determined during the selec¬ 
tion of the controller. There are two 
24-bit registers in the controller. The 
24-bit input register can accept a word 
transfer from the 520 or can assemble 
a word during a tape read operation. 
The 24-bit output register can trans¬ 
mit a word to the 520 or can disassem¬ 
ble a word into 6-bit characters during 
a tape write operation. The controller 
will generate parity (odd-binary, 
even-alphanumeric) during a tape 
write operation and will check the 
parity during a tape read operation. 
The controller has control logic for 
connection of up to four tape trans¬ 
ports of the same type (45 ips or 75 
ips). 

SPECIFICATIONS: 

Cabinet size.75.5" high x 23" 

wide x 30" depth 

Weight .525 pounds 

Power Requirement . . . .208VAC, 60 
cycle, single phase, 4 wire 


SINGLE TAPE 
TRANSPORT/5175 67 

The single Tape Transport has all the 
design features of the Master Tape 
Transport except for the data elec¬ 
tronics switcher and the control and 
status line switcher. This unit cannot 
be used to control tape transports. 



The Master Tape Transport is a medi¬ 
um speed-75 ips-solid state digital tape 
unit. The Transport features electro¬ 
mechanical tape handling, magnetic 
head, operator control panel, load point 
and end of tape sensing and control, 
file protection, fast and slow rewind, 
write-read data electronics, data elec¬ 
tronics switcher, control and status 
switcher, and all necessary power 
supplies. The Master Unit has one set 
of write-read electronics which can be 
utilized by the master and up to three 
slave tape transports. The data elec¬ 
tronics switcher directs the data elec¬ 
tronics to the proper write-read head 
in response to a command from the 
Magnetic Tape Controller (517615). 
The various controls and status com¬ 
mands are directed to the proper unit 
by the control and status line switcher. 
This arrangement allows input/output 
access to four tape transports through 
a single input/output channel. The 
tape transport assembly design fea¬ 
tures vacuum column tape buffers, 
counter rotating capstans, solenoid 
type actuators, positive alignment 
pinch rollers, and rugged disk-type 
reel brakes. 

SLAVE TAPE 
TRANSPORT/516637 

The Slave Tape Transport has all the 
design features of the Master Tape 
Transport except for write-read elec¬ 
tronics, data electronics switcher, and 
the control and status line switcher. 

SPECIFICATIONS: 

Tape Speed.75 ips—forward 

and reverse 

Reels.1014" diameter, 

14" width, (IBM compatible) 

Start Time.5 ms, bi-directional 

Stop Time.1.5 ms, bi-directional 

Rewind.Less than 3 minutes 

Tape Density .200, 556, 800 bpi 

Transfer Rates . . . 15.0 KC at 200 bpi 
41.7 KC at 556 bpi 
60.0 KC at 800 bpi 
Transport size . . . 69" rack x 30" x 24" 

Weight.390 pounds (516635) 

340 pounds (516637) 
370 pounds (517567) 

Power Requirements .105 to 125 

VAC, 58-62 cycle, single phase 


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SINGLE TAPE 


TRANSPORT/517626 

The single Tape Transport has all the 
design features of the Master Tape 
Transport except for the data elec¬ 
tronics switcher and the control and 
status line switcher. This unit cannot 
be used to control slave tape trans¬ 
ports. 


MASTER 

TAPE DIRECT 

TRANSPORT MEMORY 


The Master Tape Transport is a solid 
state device with the following com¬ 
ponent assemblies: tape transport, 
write-read head assembly, photosense, 
file protect, operator control panel, 
write-read data electronics, data elec¬ 
tronics switcher control and status 
switcher and all necessary power sup¬ 
plies. The Master Unit has one set of 
write-read electronics which can be 
utilized by the master and up to three 
slave tape transports. The data elec¬ 
tronics switcher directs the data elec¬ 
tronics to the proper write-read head 
in response to a command from the 
Magnetic Tape Controller (517615). 
The various controls and status com¬ 
mands are directed to the proper unit 
by the control and status line switcher. 
This arrangement allows input/output 
access to four tape transports through 
a single input/output channel. The 
tape transport assembly design fea¬ 
tures vacuum column tape buffer stor¬ 
age, vacuum tape dust and oxide 
cleaners integral in the head assem¬ 
blies, short unsupported tape spans to 
minimize skew and speed variations, 
and synchronously driven counter ro¬ 
tating capstans with ample reserve 
power. 

SLAVE TAPE 
TRANSPORT/517630 

The Slave Tape Transport has all the 
design features of the Master Tape 
Transport except for write-read elec¬ 
tronics, data electronics switcher, and 
the control and status line switcher. 

SPECIFICATIONS: 

Tape Speed.45 ips—forward 

and reverse 

Reels . IOV 2 " diameter, V 2 " 

width (IBM compatible) 

Start Time.5 ms, bi-directional 

Stop Time.1.5 ms, bi-directional 

Rewind . . 3 to 4 minutes for 2400 feet 
Tape Density . . . 200, 556, and 800 bpi 
Transfer Rates ... .9.0 KC at 200 bpi 
25.0 KC at 556 bpi 
36.0 KC at 800 bpi 

Transport Size .75.5" high x 23" 

wide x 30" depth 

Weight .425 pounds (517628) 

355 pounds (517630) 
390 pounds (517626) 

Power Requirements.105 to 125 

VAC, 58-62 cycle, single phase 


EXTERNAL ACCESS TO 
MEMORY (EAM)/519731 

The External Access to Memory 
switches memory between the 520 and 
an external device so the two devices 
can access memory without interfer¬ 
ence on a time-shared basis. The 
external device has priority and can 
maintain control of memory. EAM 
interface is standard 520 current 
mode for both computer and external 
device. 

DIRECT MEMORY 
ACCESS I/O 
CONTROLLER/519730 

The DMA I/O Controller allows up to 
four peripheral devices access to 
memory through the EAM. The DMA 
I/O Controller is connected to the 
520 I/O bus and controls memory 
through the EAM by presenting the 
same interface as the computer; i.e., 
memory address, data out and data in 
busses, and read and write control sig¬ 
nals. It also controls the peripheral 
devices connected to it through their 
controllers by presenting the same 
interface as the 520; i.e.. I/O control, 
data out and data in busses. 

DMA I/O CONTROLLER 
HIGH SPEED 
OPTION/519729 

Where several devices must be oper¬ 
ated simultaneously and one unit 
must have access immediately, an 
optional register set eliminates the 
memory access for control purposes. 
Each set defines one block of memory 
with necessary control information. 

SPECIFICATIONS: 


Maximum Transfer Rate 

1 0 sec 

Connect Time per Channel 

2 /*sec 

Disconnect Time per 
Channel 

2 /*sec 

Servicing Alternate 
Channels 

200 KC 

Number of Channels per 
DMA I/O 
(same as 520 I/O) 

4 

Number of Memory Blocks 
per Channel 

2 

Block Lengths 

Variable 

Block Locations 

Variable 

Changing Assigned Blocks 
of a Channel 
(not computer time) 

4 /*sec 

Word Size 

24 bits 











































CARD READ-PUNCH 
503948 


The Card Read-Punch is a device which can read standard 
80-column cards at 800 cards per minute and punch cards 
at 250 per minute. Card reading and punching are by row 
with independent reading and punching achieved through 
the use of an opposing feed design. The Card Read-Punch 
unit has easy access to all operating mechanisms and the 

CARD PUNCH CONTROLLER/518686 

The Card Punch Controller consists of a cabinet with the 
card punch controller logic chassis, power supplies, and a 
power sequencer. The controller will respond to all com¬ 
mands from the 520 (SELECT, DATA TRANSFER, DIS¬ 
CONNECT, etc.) and can control one card punch unit. The 
controller will generate and respond to control signals 
necessary to card punch operation (card feed, reset punch 
buffer, etc.). The controller contains an 80-bit punch buffer 
for row mode operation with all data formatting controlled 
by the 520. 

SPECIFICATIONS: 


Cabinet Size .75.5" high x 23" width x 30" depth 

Weight .500 pounds 

Power Requirements . . 208 VAC, 60 cycle, 3 phase, 4 wire 


operator control panel. Ease of card handling in both hop¬ 
per and stacker, sensitive misfeed detection, and automatic 
shutdown for prescribed events (full stacker, transport 
jam, etc.) are incorporated in both read and punch feed 
mechanisms. 

SPECIFICATIONS: 

Read Speed .800 cards per minute 

Punch Speed.250 cards per minute 

Hopper Capacity Reader .3000 cards 

Punch .1200 cards 

Stacker Capacity Reader .1000 cards 

Punch .1000 cards 

Unit Size.62" high x 58" wide x 30" depth 

Power Requirements.... 208 VAC, 60 cycle, 3 phase, 4 wire 

CARD READ-PUNCH CONTROLLER 
517614 

The Card Read-Punch Controller consists of a cabinet with 
the card controller logic chassis, power supplies, a power 
sequencer, and a remote power supply for the Card Read- 
Punch unit. The controller synchronizes all data and control 
signals between the Raytheon 520 and the Card Read- 
Punch. The controller has an 80-bit buffer for the Card 
Punch and an 80-bit strobe circuit for the Card Reader. 
Simultaneous reading and punching, error condition check¬ 
ing, data analysis, format control, and Card Read-Punch 
operations are under the control of the 520 through the 
Card Read-Punch Controller. 

SPECIFICATIONS: 

Cabinet Size.75.5" high x 23" width x 30" depth 

Weight .*. . 500 pounds 

Power Requirements . . 208 VAC, 60 cycle, 3-phase, 4 wire 


CARD PUNCH/519467 

The Card Punch is a device which will punch standard 80- 
column cards at the rate of 100 cards per minute. The cards 
are punched by row under control of the Card Punch Con¬ 
troller. 

SPECIFICATIONS: 

Punch Speed .100 cards per minute 

Hopper Capacity .800 cards 

Stacker Capacity.1,000 cards 

Unit Size .50" high x 50" width x 25 W depth 

Power Requirements.115 VAC, 60 cycle, single phase 


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CARD 


CARD 


CARD 


READER READER READER 

517980 519468-001 519468-002 



The Card Reader is a device which will 
read standard 80-column punched 
cards by column at a rate of 100 cards 
per minute. Under program control a 
card can be read in the binary mode 
(12 bits) or can be read in the alpha¬ 
numeric mode (6 bits). The alphanu¬ 
meric mode has a Hollerith-to-520 
code conversion (12 bits to 6 bits). 
The card reader is a compact, light¬ 
weight unit with convenient access to 
all controls. Reliable starwheel oper¬ 
ated switches are used for data hole 
detection. The controller for the Card 
Reader is part of the basic I/O chassis 
in the main frame of the 520. 

SPECIFICATIONS: 

Read Speed .... 100 cards per minute 

Hopper Capacity . ..500 cards 

Reader Size .18" long x 10" wide 

x 9" high 

Reader Weight .25 pounds 

Power Requirements .115VAC, 

60 cycle, single phase 



The Card Reader is a device which will 
read standard 80-column punched 
cards by column at a rate of 400 cards 
per minute. Under program control a 
card can be read in the binary mode 
(12 bits) or alphanumeric mode (6 
bits). The alphanumeric mode has a 
Hollerith-to-520 code conversions (12 
bits to 6 bits). Both the card reading 
and the card timing are photoelectric. 
Simplicity of design results in ease of 
operation. Cards may be loaded and 
unloaded during card read operation 
and extensive error checking results 
in ease of maintenance. The controller 
for the Card Reader is part of the 
basis I/O chassis in the main frame of 
the 520. 

SPECIFICATIONS: 

Read Speed .... 400 cards per minute 

Hopper Capacity.1,400 cards 

Stacker Capacity.1,000 cards 

Reader Size.18" high x 22" 

wide x 80" depth 

Reader Weight .125 pounds 

Power Requirements .115VAC, 

60 cycle, single phase 



The Card Reader is a device which will 
read standard 80-column punched 
cards by column at a rate of 800 cards 
per minute. Under program control 
reading may be binary (12 bits) or 
alphanumeric (6 bits). The alphanu¬ 
meric mode has a Hollerith-to-520 code 
conversion (12 bits to 6 bits). Solid 
state electronics are used for photo¬ 
electric hole detection, card timing 
pulses, and error checking circuitry. 
Error checking includes throat jam 
check, transport check, output hopper 
jam check, photo diode check, and tim¬ 
ing photo diode check. All controls 
have easy access; card handling dur¬ 
ing operation is facilitated by simplic¬ 
ity of console design. The controller 
for the Card Reader is part of the 
basic I/O chassis in the main frame of 
the 520. 

SPECIFICATIONS: 

Read Speed.800 cards 

per minute 

Hopper Capacity.2,500 cards 

Stacker Capacity .2,000 cards 

Reader Size .40" high x 29" 

wide x 33" depth 

Reader Weight .325 pounds 

Power Requirements.115VAC, 

60 cycle, single phase 


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TYPEWRITER 


PREPARATION 



517856/517733 


UNIT 

516850 




The Tape Preparation Unit is an off-line preparation desk 
equipped with a typewriter, a paper-tape punch with supply 
and take-up reels, and a paper-tape reader with bi-direc¬ 
tional tape reading capability. 

Five operating modes are available on this unit: read-type- 
punch, read-punch, read-type, type-punch, and type. Other 
features: 7-bit (alphanumeric) 8-bit (binary) code select, 
single character read (forward or reverse), parity error 
and reader error indicators, and 8-bit stop code selection 
which provides for any 8-bit code to be punched or searched 
for on the reader. 

SPECIFICATIONS: 

Height.29 inches 

Width.30 inches 

Length.67 inches 

Weight (including electronics) .375 pounds 

Reader Speed .60 cps. 

Punch Speed .20 cps. 

Typewriter Speed .15.5 cps. 


SPECIFICATIONS: 


Printing Cycle .15.5 cps. 

Cycle Time .65.5 ms. 

Carrier Return and Tabulation.17" per second 

Shift Cam and Clutch .15.5 cps. 

Backspace .15.5 cps. 

Spacing.15.5 cps. 

Type Element .913 (programming) 

Writing Line Length.13" Rack Mounted (517856) 

13" For Console Mounting (517733) 


The Typewriter is a 64-character input/output device capa¬ 
ble of typing at rates up to 15 characters per second. 
Characters typed out by the typewriter are spaced 10 to an 
inch horizontally and 6 to an inch vertically. Unique design 
features include high print speed and a stationary carriage. 
The Typewriter accepts coded parallel bits (7 bits, including 
check) for alphanumeric printout. In addition, it gener¬ 
ates coded parallel bits from keyboard operation for input 
purposes. Remote shift, line feed, backspace, solenoid oper¬ 
ated keyboard lock, and end of line indication are provided 
as standard equipment. The controller for the Typewriter 
is part of the basic I/O chassis in the main frame of the 520. 






















































DISK PACK UNIT 



The Disk Pack Unit is a device which provides a fast, 
efficient means of information storage and retrieval. 
Information is stored on removable disk packs which can be 
interchanged between units without restriction. A disk 
pack can store 2 million alphanumeric characters when 
written in the sector mode or 2.98 million when written in 
the track-record mode. The access mechanism has ten read/ 
write heads which track horizontally across the disk pack 
surface during a seek operation. Direct seek is a standard 
feature which reduces access time when changing tracks. 
Each of the ten surfaces has 100 tracks which can be 
divided into sectors (20 per track) or records (1 per track). 
The cylinder concept is used in the addressing of the access 
mechanism for IBM compatibility. 

SPECIFICATIONS : 


Physical Size.40 3 /4" high x 36" long x 24" wide 

Weight .480 pounds 

Storage Capacity.sector mode: 2,000,000 characters 


track-record mode: 2,980,000 characters 


Tracks per Surface .100 

Read/Write Heads .10 

Maximum Access Time .145 ms. 

Maximum Latency Time . . .40 ms. (1500 rpm disk speed) 

Track to Track Access Time .30 ms. 

Character Definition .7-bit BCD 

Addressing.IBM Compatible 

Recording Method .. . . .NRZI 

Average Data Transfer Rate. sector mode: 50,000 char/sec. 

track record mode: 74,500 char/sec. 
Power Requirements .208 VAC, 60 cycle, three phase 

DISK PACK CONTROLLER 
517970 

The Disk Pack Controller consists of a cabinet with the disk 
pack controller logic chassis, power supplies, and a power 
sequencer. The controller will respond to all commands from 
the 520 (SELECT, DATA TRANSFER, DISCONNECT, 
etc.) and can control up to four disk pack units. The con¬ 
troller will generate and respond to control signals neces¬ 
sary to disk pack operations (read/write control, head 
select, track select, etc.). The addressing format follows 
the cylinder concept with either sector mode or track- 
record mode. A cylinder can be defined as a vertical plane 
which contains ten tracks. Since the disk pack unit has ten 
read/write heads located in the same relative position on 
each surface there is no movement of the access mechanism 
when operating within a cylinder. Sequential operation 
within a cylinder can access up to 200 sectors with one com¬ 
mand. Two 24-bit registers provide word buffering during 
read/write operations with automatic parity generation 
and checking. 

SPECIFICATIONS: 


Cabinet Size .75.5" high x 23" width x 30" depth 

Weight .600 pounds 

Power Requirements . . 208 VAC, 60 cycle, 3 phase, 4 wire 


DISK PACK/517972 

The Disk Pack is a precision device which has six disks 
mounted apart on a vertical shaft. Each disk is 14" in 
diameter and has two surfaces coated with magnetic iron 
oxide for recording information. Each surface has one hun¬ 
dred data tracks which are .020" apart. The inner track is 
9" in diameter and the outer track is 13" in diameter. The 
six disks provide ten surfaces for recording data as the 
upper surface of the top disk and the lower surface of the 
bottom disk are not available due to protective plates. Each 
disk pack is removable and interchangeable between units. 
Each disk pack can store 2 million alphanumeric characters 
when written in the sector mode or 2.98 million characters 
when written in the track-record mode. 


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i 





MULTIDEVICE CONTROLLER/517975 


To meet the need of the computer data systems market, 
Raytheon Computer has designed a simplified and gener¬ 
alized computer interface, the Multidevice Controller, 
which is intended to be equivalent to a “Real-Time Data 
and Control System Package/' The design philosophy 
employed recognizes the fact that customer capability has 
increased in recent years to the point where extensions of 
a basic logical design may be implemented with standard 
digital modules by virtually all laboratories making use of 
data systems equipment. 

The Multidevice Controller (MDC) utilizes standard Ray¬ 
theon Computer modules, power supplies, and mounting 
hardware. The MDC may be supplied in a low cost minimum 
configuration which may be expanded as required in the 
field by plugging in additional digital modules and/or by 
installing standard pre-wired sub-assemblies. It is practical 
to implement almost any imaginable system requirement 
in this manner. The standardized hardware and techniques 
result in lower cost, simpler and easier to maintain systems. 
In addition, modifications require far less time and effort. 

MDC OPTION—MULTIDEVICE 
CONTROLLER EXPANSION/517976 

This is an expansion of the device addressing capability of 
the MDC in increments of eight. The device addressing 
capability can be expanded in increments of eight to 512 
devices. 

MDC OPTION-REAL TIME 
CLOCK/517979 

The Real Time Clock is a 24-bit system with a one mega¬ 
cycle or external clock input. This system can be read out 
or set to a desired configuration by command of the 520. 
The system can be connected to the normal or priority in¬ 
terrupt system for overflow detection. 

MDC OPTION —FOUR-LEVEL 
PRIORITY INTERRUPT/517977 

One of the optional features available with the MDC is a 
priority interrupt system which begins with four levels of 
priority and is expandable in increments of four to 32 
levels. This permits a hardware priority level assignment 


which can be changed, at the requirement of the user, by 
changing the wiring to a patchboard. 

The system examines all levels for the presence of an inter¬ 
rupt. When at least one interrupt is present, the system 
determines which has priority. Unless an interrupt of 
higher priority is being processed, the system will send 
an interrupt to the 520 and will generate an address unique 
to the priority interrupt. The 520 will acknowledge the 
interrupt and transfer to the subroutine to process the pri¬ 
ority interrupt. The priority interrupt will be processed, 
unless interrupted by a higher priority, and will indicate 
completion to the priority interrupt system. 

MDC OPTION —PRIORITY INTERRUPT 
SYSTEM EXPANSION/517978 

This is an expansion of the Four-Level Priority Interrupt 
system by four levels. The four-level priority interrupt sys¬ 
tem can be expanded in increments of four to 32 levels. 

Another option permits expansion of the priority interrupt 
system to 1024 levels in increments of two. 

MDC OPTION—ASSEMBLY 
REGISTER/519469 

The 24-bit Assembly Register can assemble one 24-bit 
word, two 12-bit words, three 8-bit words, or four 6-bit 
words. The determination of word size to be assembled can 
be program controlled or fixed externally by pin assign¬ 
ment. When the register is fully loaded, an interrupt will 
be generated. 

POWER FAILURE PROTECTION 
SYSTEM/519470 

The Power Failure Protection System monitors the AC 
input line to the 520. In the event of power failure, normal 
program sequence is interrupted and program control is 
transferred to a register save program. The register save 
program executes from a diode matrix memory and stores 
all the addressable registers and toggles into core memory. 
The location in core memory for register and toggle storage 
can be specified by the user when the system is purchased. 
Computer operation is halted at the termination of the 
register save program. 


MAGNETIC DRUM CONTROLLER 
519809 

The Magnetic Drum Controller consists of a cabinet with 
the magnetic drum controller logic chassis, power supplies, 
power sequencing and the mounting for one magnetic drum 
unit. The controller will respond to all commands from the 
520 (select, data transfer, disconnect, etc.) and can control 
up to four magnetic drum units. The controller will gen¬ 
erate and respond to control signals necessary to magnetic 
drum operation (read/write control, ready line, etc.). The 
addressing format is word oriented and can be either ran¬ 
dom or sequential. Direct addressing to 1,048,576 words 
with automatic parity generation and checking is stand¬ 
ard. Two 25-bit registers provide word buffering during 


read and write operations. In a sequential mode of opera¬ 
tion track switching and disk switching is automatic with 
addressing required at the beginning of the operation only. 

SPECIFICATIONS : 

Cabinet Size 75.5" high x 23" width x 30" depth 

Weight 650 pounds 

Power Requirements 208 VAC, 60 cycle, 3 phase, 4 wire 


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PAPER-TAPE READER/517622 

The Paper-Tape reader is a photo-electric reader that will read up to eight-channel 
punched paper tape at a rate of 300 characters per second in either the forward 
or reverse direction. The paper tape may be read in either binary (8-bit) or alpha¬ 
numeric (7-bit plus parity bit) mode. The controller for the paper-tape reader is 
part of the basic I/O chassis in the main frame of the 520. 

SPECIFICATIONS: 


Speed .300 characters per second 

Direction .Bi-directional 

Tape.Tape Guide Adjustable for 11/16" or 1" Tape 

Start Time .8 ms. 

Stop Time .0.5 ms. 


PAPER-TAPE SPOOLER/530507 

The Paper-Tape Spooler is a bi-directional device which can automatically supply 
tape to and take up tape from the paper-tape reader at the proper speed and ten¬ 
sion. Rewind operations can be performed in either the forward or the reverse 
direction. 

SPECIFICATIONS: 

Tape Speed, Servo Mode .0-30 inches per second 

Tape Direction, Servo Mode .Bi-directional 

Rewind Speed .200 inches per second, bi-directional 

Tape Width .tape reel for 11/16" and 1" tape 


PAPER-TAPE PUNCH/517624 


The Paper-Tape Punch is a high speed electro-mechanical device which records 
information under program control on paper tape at speeds up to 110 characters 
per second. A high carbon steel punch pin assures positive tape perforation and 
long pin life. A self-adjusting brake mechanism provides positive control for 
rapid starting and stopping movements of the tape reel. An all steel cover and 
resilient rubber motor mounts reduce noise and absorb vibration. Information 
will be punched in either binary (8-bit) or alphanumeric (7-bit plus parity) mode. 
The controller for the paper-tape punch is part of the basic I/O chassis in the main 
frame of the 520. 

SPECIFICATIONS: 


Speed. 

Capacity. 

Characters per inch 
Tape Dimensions . 


.110 characters per second 

.1,000-foot roll of tape 

.10 characters 

.... 11/16" tape with 5 level code 
1" tape with a 6, 7, or 8 level code 


DRUM MEMORY 

For applications where fast access and transfer rate to 
bulk storage are needed, the 520 System utilizes a high¬ 
speed, random access Drum Memory system. Maximum 
access time to the Drum is 10 milliseconds and transfer 
rate to and from the Drum is 50,000 words (200,000 char¬ 
acters) per second. Maximum data storage on the Drum is 
262,144 words (1,050,624 characters). The Drum input/ 
output controller will accommodate up to four Drum 
Memory units. 

MAGNETIC DRUM MEMORY/519808 

The Magnetic Drum Memory is a device which offers large 
memory capacity with fast access time. The recording sur¬ 
face has 256 data tracks and each data track has 512 words. 
The Magnetic Drum has eight timing tracks which are used 


by the controller to synchronize data transmission. A sepa¬ 
rate read/write head is provided for each track which 
allows simplicity of design and eliminates time consuming 
search and positioning operations. The unit is compact and 
is shock-mounted on a standard 19-inch slide rack. 


SPECIFICATIONS : 
Speed 

Access Time 
Word Density 
Tracks 

Total Words per Unit 
Word Time 
Physical Size 
Weight 

Power Requirements 


6000 RPM 

5 milliseconds, average 
512 words per track 
256 

131,072 

19.5 microseconds 
19" diameter x 18" high 
100 pounds 

115/208 VAC, 400 cycle, 3 phase, 
4 wire 









































RAYTHEON COMPUTER 

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RAYTHEON COMPUTER 

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P. 0. Box 508 

Bedford, Mass. 01730 

Phone: (617) 274-7100, Ext. 643 and 644 

TWX 617 274-6487 

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204 East Main 
Arlington, Texas 
Phone (817) CR 5-5361 
TWX 817 274-3917 

Houston, Texas 
Phone (713) WA 3-1144 

Washington, D. C. 

Eastern Regional Office 

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4217 Wheeler Avenue 
Alexandria, Va. 22304 
Phone (703) 836-7616 
TWX 703 931-4247 




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2700 SOUTH FAIRVIEW ST., SANTA ANA, CALIFORNIA 92704 


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