RCA 301 Manuel utilisateur

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RCA

ELECTRONIC

3

0

1

L.

Morr/s

CSCP

LLMorris

CSCW

DATA

PROCESSING

SYSTEM

PROGRAMMERS'

REFERENCE

MANUAL

RADIO

CORPORATION

OF

AMERICA

Electronic

Data

Processing,

RCA-Cherry

Hill

Camden

8,

N.

J.

93-16-000

November,

1966

The

information

contained

herein

is

subject

to

change

without

notice.

Revisions

ifiay

be

issued

to

advise

of

such

changes

and/or

additions.

Reissued:

June,

1964

This

manual

has

been

reprinted

to

include

all

revisions

through

November,

1966.

L.

Morris

CONTENTS

Page

I

—THE

RCA

301

SYSTEM

—

GENERAL

DESCRIPTION

Introduction

1-1

System

Elements

Description

1-1

The

RCA

301

Code

1-5

Organization

of

Data

1-7

II

—PERIPHERAL

EQUIPMENT

—

FUNCTIONAL

DESCRIPTION

Card

Equipment

II-1

Paper

Tape

Equipment

II-2

On-Line

Printer

II-3

Monitor

Printer

II-4

Interrogating

Typewriter

II-4

MICR

Sorter/Reader

II-5

Hi-Data

Tape

Group,

Model

381

II-5

Hi-Data

Tape

Group,

Model

382

II-6

33KC

Magnetic

Tape

Station

II-6

66KC

Magnetic

Tape

Station

II-6

Multiple

Tape

Lister

II-7

'Data

Exchange

Control

II-7

Random

Access

Computer

Equipment

II-7

Data

Record

File

H-7

Data

Disc

File

H-8

3488

Unit

jj.g

III

—

THE

COMPUTER

—

FUNCTIONAL

DESCRIPTION

High

Speed

Memory

III-l

The

Basic

Instruction

III-l

Program

Control

HI_3

The

Console

111-10

IV

—

THE

RCA

301

INSTRUCTIONS

—

GENERAL

DESCRIPTION

IV-1

V

—

DATA

HANDLING

INSTRUCTIONS

Translate

by

Table

(A)

y_3

/

Locate

Symbol

Left

(K)

V-5

Locate

Symbol

Right

(L)

y_7

^

Transfer

Data

Left

(M)

y_9

•

Transfer

Data

Right

(N)

V-10

v

Transfer

Data

by

Symbol

Left

(#)

V-ll

y

Transfer

Data

by

Symbol

Right

(P)

V-12

Transfer

Symbol

to

Fill

(J)

V-13

VI

—

ARITHMETIC

INSTRUCTIONS

Add

(

+

)

VI.3

Subtract

(

—)

Vl.g

Logical

"OR"

(Q)

yj.g

Logical

"AND"

(T)

VI-10

Exclusive

"OR"

(U)

VI-12

VII

—

DECISION

AND

CONTROL

INSTRUCTIONS

Store

Register

(V)

VII-3

•

Conditional

Transfer

of

Control

(W)

VII-5

•Compare

Left

(Y)

VII-7

iii

VII

—

DECISION

AND

CONTROL

INSTRUCTIONS

(Cont'd)

Page

Tally

(X)

VII-9

^

Halt

(.)

VII-10

•

Repeat

(R)

VII-11

VIII

—

INPUT/OUTPUT

INSTRUCTIONS

—

CARD

Card

Read

Normal

(0)

(Model

323

Card

Reader)

VIII-3

Card

Read

Normal

(0)

(Model

324,

329

Card

Reader)

VIII-5

w-

Card

Read

Normal

(0)

(Model

330

Card

Reader-Punch)

VIII-7

Card

Read

Simultaneous

(1)

(Model

323

Card

Reader)

VIII-9

Card

Read

Simultaneous

(1)

(Model

324,

329

Card

Reader)

VIII-11

Card

Read

Simultaneous

(1)

(Model

330

Card

Reader-Punch)

VIII-12

Card

Punch

Normal

(2)

(Model

334

Card

Punch)

VIII-14

Card

Punch

Normal

(2)

(Model

336

Card

Punch)

VIII-15

\SCard

Punch

Normal

(2)

(Model

330

Card

Reader-Punch)

VIII-16

Card

Punch

Simultaneous

(3)

(Model

334

Card

Punch)

VIII-17

Card

Punch

Simultaneous

(3)

(Model

336

Card

Punch)

VIII-18

Card

Punch

Simultaneous

(3)

(Model

330

Card

Reader-Punch)

VIII-19

^"Input/Output

Control

(;)

(Model

330

Card

Reader-Punch

and

Model

324,

329

Card

Reader)

. .

VIII-20

v"Input/Output

Sense

(S)

VIII-21

IX

—

INPUT/OUTPUT

INSTRUCTIONS

—

TAPE

/Tape

Read

Forward

Normal

(4)

IX-3

Tape

Read

Forward

Simultaneous

(5)

IX-6

vTape

Read

Reverse

Normal

(6)

IX-7

Tape

Read

Reverse

Simultaneous

(7)

IX-9

•/Tape

Write

Normal

(8)

IX-10

Tape

Write

Simultaneous

(9)

IX-12

v

R ewind

to

BTC

(;)

IX-13

/Input/Output

Sense

(S)

IX-14

/Automatic

Rollback

Control

(S)

IX-16

/Sense

Read

Error

(S)

IX-17

X

—

INPUT/OUTPUT

INSTRUCTIONS

—

PRINTER

"

Print

and

Paper

Advance

Normal

(B)

X-3

Print

and

Paper

Advance

Simultaneous

(C)

X-5

/Input/Output

Sense

(S)

X-7

XI

—

INPUT/OUTPUT

INSTRUCTIONS

—

DATA

RECORD

FILE

Band

Select

Normal

(D)

XI-3

Band

Select

Record

File

Mode

(E)

XI-5

Block

Read

Record

Normal

(F)

XI-7

Block

Read

Record

Simultaneous

(G)

XI-9

Block

Write

Record

Normal

(H)

XI-11

Block

Write

Record

Simultaneous

(I)

XI-13

Record

File

Mode

Read

(*)

XI-15

Record

File

Mode

Write

(%)

XI-17

Input/Output

Sense

(S)

XI-19

XII

—

INPUT/OUTPUT

INSTRUCTIONS

—

DATA

DISC

FILE

v/

Track

Select

(D)

v'Sector

Read

Disc

Normal

(F)

Sector

Read

Disc

Simultaneous

(G)

v

Sector

Write

Disc

Normal

(H)

XII-3

XII-4

XII-6

XII-8

iv

L

.i

Morris

XII

—

INPUT/OUTPUT

INSTRUCTIONS

—DATA

DISC

FILE

(Cont'd)

Page

Sector

Write

Disc

Simultaneous

(I)

xn

jq

-'Input/Output

Sense

(S)

XII-12

XIII

—

INPUT/OUTPUT

INSTRUCTIONS

—DATA

EXCHANGE

CONTROL

-

Tape

Read

Forward

Normal

(4)

XIII-3

•

Tape

Read

Forward

Simultaneous

(5)

XIII-4

^

Tape

Write

Normal

(8)

xm

^

Tape

Write

Simultaneous

(8)

XIII-6

•

Input/Output

Sense

(S)

xm

7

XIV

—INPUT/OUTPUT

INSTRUCTIONS

—

MULTIPLE

TAPE

LISTER

Print

Tape

Normal

(8)

xjy

^

Print

Tape

Simultaneous

(9)

xjy

4

Input/Output

Sense

(S)

XIV-5

XV

—

INPUT/OUTPUT

INSTRUCTIONS

—

RANDOM-ACCESS

COMPUTER

EQUIPMENT

SeIect

(°)

XV-3

Read

Normal

(4)

Xy

5

Read

Simultaneous

(5)

,

Write

Normal

(8)

Xy

^

Write

Simultaneous

(9)

xy

g

Input/Output

Sense

(S)

xv

APPENDICES

A

—

RCA

301

Codes

^

B —

List

of

Instructions

g

}

C —

Summary

of

Instructions

^

1

D

—

Instruction

Timing

E

Standard

High

Speed

Memory

Locations

£

^

F-I

—

Symbols

Used

for

N

Character

Counts

Except

in

Repeat

and

Paper

Advance

F-l

F-II

—

Symbols

Used

for

N

Character Counts

in

Repeat

and

Paper

Advance

Instructions

F-l

G

—

Device

Identification

for

Input/Output

and

IOS

Instructions

r

i

H

—

Print

Table

H-1

I

—

Control

Characters

and

Printable

Characters

for

the

Multiple

Tape

Lister

'

M

J

—

Glossary

of

Terms

ILLUSTRATIONS

Figure

1.

Recording

on

Data

Disc

File

j

g

2.

Recording

on

Magnetic

Record

j

g

3.

Recording

on

Hi-Data

Tape

j

4.

Recording

on

Paper

Tape

I

g

5.

Block

Diagram

of

Basic

RCA

301

Computer

m

4

6.

RCA

301

Console

Display

111-13

v

HRSfOTPflf

I

I

I

•

I

THE

RCA

301

S YSTEM

L.r

Morris

I

—

GENERAL

DESCRIPTION

INTRODUCTION

The

RCA

301

Electronic

Data

Processing

System

is

a

general

purpose,

stored

program,

digital

processor

employing

solid-state

electronic

circuitry.

Highly

flexible

RCA

301

Systems

are

integrated

from

a

diversified

array

of

input/

output

devices,

a

range

of

memory

sizes,

and

other

special

features.

Each

System

is

tailored

to

meet

the

data

processing

requirements

of

a

specific

organization.

While

each

RCA

301

System

is

complete

within

itself,

a

high

degree

of

compatibility

has

been

attained

with

the

medium-scale

RCA

501,

the

medium-scale

RCA

Realcom

3301,

and

the

large-scale

RCA

601.

System

efficiency

is

enhanced

by:

•

Rapid

memory

access

time

•

Character

addressability

providing

completely

variable

data

organization

•

Decimally

addressed memory

•

Built-in

and

programmed

accuracy

controls

•

Machine

code

covering

full

range

of

numerics,

alphabetics,

and

special

symbols

•

Automatic

and

programmed

storage

in

High-Speed

Memory

of

the

contents

of

various

Program

Control

Registers

•

Direct

and

Indirect

Addressing

•

A

powerful

programming

instruction

repertoire

including

the

following:

•

A

Translate

by

Table

instruction

permitting

efficient

internal

processing

of

various

code

structures

•

Locate

Symbol

instructions

permitting

an

internal

search

within

High-Speed

Memory

for

any

character

designated

•

Transfer

instructions

permitting

transfer

of

data

to

left

or

right

within

High-Speed

Memory

•

Arithmetic

instructions

permitting

Logical

"OR",

Logical

"AND"

and

Exclusive

"OR"

•

A

Repeat

instruction

permitting

the

next

repeatable

instruction

to

be

repeated

a

specified

number

of

times

•

Automatic

programming

aids

include

RCA

301

COBOL,

Assembly

System,

FORTRAN,

and

a

Scientific

Interpreter.

An

extensive

library

of

service

and

maintenance

routines

is

also

available.

The

System

processes

information

prepared

by

a

variety

of

input

media

for

distribution

to

the

appropriate

out-

put.

The

complete

compatibility

of

System

elements

provides

for

ease

of

expansion

at

a

later

date,

which

is

part

of

the

System

philosophy.

SYSTEM

ELEMENTS

DESCRIPTION

The

RCA

301

Computer

comprises

a

Processor

and

appropriate

Input/Output

Control

Modules.

The

latter

operate

the

peripheral

devices

connected

in

the

system.

The

Processor

is

a

general

purpose,

stored

program,

digital

machine

which

includes

the

following

sub-units:

High-Speed

Memory,

Program

Control,

Console

Panel,

and

Power

Supply.

The

Simultaneous

Mode

Control

may

be

included

in

the

system

to

provide

concurrent

operation

of

two

input/output

devices,

or

an

input/output

instruction

with

a

compute

instruction.

The

High-Speed

Memory

is

a

random

access,

magnetic

core

device

which

provides

storage

and

work

area

for

programs

and

data.

The

memory

capacity

is

10,000

(Model

303),

20,000

(Models

304

and

354),

or

40,000

(Models

305

and

355)

alphanumeric

characters.

Each

location

is

decimally

addressable

and

can

store

one

of

the

RCA

301

characters.

The

RCA

301

code

includes

all

the

letters

of

the

alphabet,

the

ten

decimal

digits,

and

control

and

special

symbols.

(Refer

to

301

Code

Chart,

Appendix

A.)

The

memory

cycle

time

to

address,

bring

into

register,

and

regenerate

a

diad

in

its

original

memory

location

is

7

microseconds.

1-1

The

Program

Control

executes

the

instructions

of

the

program

stored

in

the

High-Speed

Memory

and

performs

the

automatic

accuracy

checks.

The

classes

of

instructions

are:

Data

Handling,

Arithmetic,

Decision

and

Control,

and

Input/Output.

Both

direct

and

indirect

addressing

can

be

employed.

The

Console

Panel

provides

for

complete

monitoring

of

operation

of

the

Processor.

Adequate

indicators

and

controls

are

provided

on

the

panel

to

initiate

normal

computer

operation

and

to

facilitate

program

check-out

and

maintenance.

The

Power

Supply

distributes

power

to

the

Processor

and

to

certain

Peripheral

Equipments

which

require

d-c

or

regulated

a-c

power.

Other

Peripheral

Equipments,

not

requiring

d-c

or

regulated

a-c,

are

supplied

from

the

power

mains

individually.

The

Simultaneous

Mode

Control

pemits

the

operation

of

one

input/output

device

simultaneously

with

another

operation

being

performed

by

the

Computer.

This

other

operation

being

performed

by

the

Computer

can

be

a

second

input/output

instruction

or

a

compute

instruction.

The

Record File

Mode

Control

provides

an

additional

degree

of

simultaneity

so

that

reading

from

or

writing

to

one

of

four

Data

Record

Files

can

be

time-shared

with

other

operations.

The

Input/Output

Control

Modules

control

the

peripheral

equipment,

generally

one

for

each

device

used

in

a

system.

The

modules

are

installed

only

when

their

associated

input/output

devices,

described

in

succeeding

para-

graphs

of

this

section,

are

added

to

the

system.

The

Card

Reader,

Model

323,

reads

information

punched

in

80-column

cards

for

transfer

to

the

Processor.

Hollerith

card

code

may

be

automatically

translated

to

RCA

301

code.

It

is

possible

to

bypass

automatic

translation

and

read

cards

binarily.

Cards

are

read

at

rates

up

to

600

cards

per

minute.

Information

may

be

edited

and

rearranged

under

program

control.

The

Card

Reader,

Model

324,

reads

information

punched

in

80-column

cards

for

transfer

to

the

Processor.

Automatic

translation

between

Hollerith

card

code

and

301

code

is

provided

under

program

control.

Cards

may

be

read

binarily

under

program

control.

Reading

is

performed

at

a

rate

of

up

to

900

cards

per

minute.

The

Card

Reader,

Model

329,

reads

information

punched

in

80-column

cards

for

transfer

to

the

Processor.

Automatic

translation

between

Hollerith

card

code

and

301

code

is

provided

under

program

control.

Cards

may

be

read

binarily

under program

control.

Reading

is

performed

at

a

rate

of

up

to

1500

cards

per

minute.

The

Card-Reader-Punch,

Model

330,

consists

of

an

80-column

card

reader

and

card

punch

in

the

same

enclosure.

Reading

is

performed

at

rates

up

to

800

cards

per

minute

and

punching

at

rates

up

to

250

cards

per

minute.

Automatic

translation

between

Hollerith

card

code

and

301

code

is

provided.

Under

program

control,

auto-

matic

translation

may

be

by-passed

to

permit

reading

or

punching

binary

coded

cards.

Card

reading,

punching

and

editing

are

performed

under

complete

control

of

the

stored

program.

Concurrent

reading

and

punching

may

be

performed

when

the

Simultaneous

Mode

Control

is

included

in

the

system.

Paper

tape

input

and

output

is

provided

by

three

optional

paper

tape

devices.

The

Paper

Tape

Reader

and

Punch,

Model

321,

is

a

single

unit

which

permits

on-line

reading

from

and

punching

either

5

or

7-channel

paper

tape at

the

rate

of

100

characters

per

second.

The

Paper

Tape

Reader,

Model

322,

is

a

single

unit

which

permits

on-line

reading

from

5,

6,

or

7-channel,

odd

or

even

parity,

paper

tape

at

either

500

or

1000

characters

per

second.

The

Paper

Tape

Punch,

Model

331,

is

a

single unit

which

permits

punching

5

or

7-channel

paper

tape

at

100

characters

per

second.

The

High-Speed

Paper

Tape

Punch,

Model

332,

is

a

single

unit

which

permits

punching

of

7-channel

paper

tape

at

300

characters

per

second.

Two

models

of

the

On-Line

Unbuffered

Printer

are

available;

one

printing

120

characters

per

line

(Model

333)

and

the

other

printing

160

characters

per

line

(Model

335).

The

120-characters

per

line

model

has

a

printing

rate

up

to

approximately

1000

lines per

minute

during

synchronous

printing,

with

the

ability

to

print

47

selected

characters,

and

up to

approximately

800

lines

per

minute,

with

the

ability

to print

64

characters.

The

160-character

per

line

model

has

a

printing

rate

up to

approximately

1075

lines

per

minute,

with

the

ability

to

print

from

47

selected

characters,

and

up

to

approximately

835 lines

per

minute,

with

the

ability

to

print

64

characters.

Two

120-character

1-2

or

two

160-character

printers

can

be

operated

simultaneously

in

the

system.

Paper

can

be

advanced

at

the

rate

of

150

lines

a

second

on

both

models,

independently

of

normal

data

processing

activity.

The

printer

operation,

variations

in

format,

and

complete

editing

are

under

the

control

of

the

stored

program.

Two

models

of

the

On-Line

Buffered

Printer

are

available,

one

printing

120

characters

per

line

and

the

other

printing

160

characters

per

line.

Buffer

storage

capacity

of

the

120-character

per

line

model

is

184

characters

(120-

character

data

line

plus

64-character

print

table);

buffer

storage

capacity

of

the

160-character

per

line

model

is

224

characters

(160-character

data

line

plus

64-character

table).

Scanning

references

the

data

line

and

the

print

table

in

the

buffer.

The

Processor

mode

is

free

on

completion

of

transfer

to

the

buffer.

Data

transfer

is

by

diad,

at

the

rate

of

14

microseconds

per

diad.

Printing

and

paper

advance

are

accomplished

off-line.

Rated

speeds

for

printing

and

paper

advance

are

the

same

as

specified

for

the

unbuffered

models.

The

Monitor

Printer,

Model

338,

is

used

for

listing

intermediate

or

final

totals

of

a

computer

program,

summary

reports

or

for

program

testing.

The

output

rate

is

up

to

10

characters

per

second.

All

of

the

301

characters

may

be

printed.

The

Interrogating

Typewriter,

Model

328,

is

an

input/output

device,

which

allows

inquiry

messages

to

be

entered

into

the

system

via

a keyboard,

and

data

from

the

computer

to

be

printed

at

a

rate

of

up

to

10

characters

per

second.

All

of

the

301

characters

are

used.

The

operation

is

performed

under

control

of

the

stored

program.

The

MICR

Sorter/Reader

sorts

magnetically

encoded

documents

under

control

of

the

stored

program.

Data

is

also

verified

and

accumulated

for

further

processing

by

the

Computer.

Six-inch

documents

can

be

read

at

rates

up

to

1560

per

minute.

A

supplementary

programmers'

reference

manual

(#93-16-001)

is

available

for

use

in

program-

ming

this

equipment.

The

Data

Record

File,

Model

361,

provides

mass

storage

of

over

4.6

million

characters

per

file.

Each

file

contains

128

magnetic

records. From

one

to

9000

characters

may

be

transferred

between

High-Speed

Memory

and

the

Data

Record

File,

with

one

instruction,

at

a

transfer

rate

of

2500

characters

per

second.

As

many

as

six

Data

Record

Files

can

be

used

in

the

system

with

as

many

as

three

of

the

files

being

written

to

or

read

from

simultaneously.

A"

The

Data

Disc

File,

Model

363,

provides

rapid

random

access

storage

in

modules

of

22

million

alphanumeric

characters.

Each

side

of

a

magnetic

disc

is

divided

into

1152

data

tracks.

The

contents

of

a

complete

track

(1600

characters)

can

be

transferred

between

High-Speed

Memory

and

the

Data

Disc

File,

with

one

instruction,

at

a

transfer

rate

of

32,000

characters

per

second.

The

Hi-Data

Tape

Group,

Model

381,

is

composed

of

a

cluster

of

up

to

six

tape

decks

with

a

common

set

of

controls,

power

supply,

and

switching

circuits.

Reading

is

performed

in

either

the

forward

or

reverse

direction.

The

read/write

rate

is

approximately

10,000

alphanumeric

characters

per

second.

Two

Hi-Data

Tape

Groups

may

be

utilized

in

a

system

for

a

total

of

12

tape

decks.

In

this

case,

two

tape

decks,

one

from

each

group,

may

be

operating

simultaneously.

The

Hi-Data

Tape

Group,

Model

382,

is

composed

of

a

cluster

of

up

to

six

tape

decks

with

a

common

set

of

controls,

power

supply

and

switching

circuits.

Reading

is

performed

in

either

the

forward

or

reverse

direction.

The

read/write

rate

is

approximately

30,000

alphanumeric

characters

per

second

in

the

382

Mode

and

20,000

alpha-

numeric

characters

per

second

in

the

381

Mode.

Two

Hi-Data

Tape

Groups,

Model

382,

may

be

utilized

in

a

system

for

a

total

of

12

tape

decks.

In

this

case,

two

tape

decks,

one

from

each

group,

may

be

operating

simultaneously.

With

a

special

control

module

and

special

features

on

each

tape

deck,

two

tape

decks

in

the

same

group

may

be

operating

simultaneously.

33KC

Magnetic

Tape

Stations

are

operated

through

either

33KC

Tape

Adapters

or

33KC

Dual

Tape

Channels.

Reading

is

performed

in

either

the

forward

or

reverse

direction.

The

read/write

rate

is

approximately

33,333

alpha-

numeric

characters

per

second.

Up

to

14

33KC

Tape

Stations

may

be

operated

in

the

system.

66KC

Magnetic

Tape

Stations

are

operated

through

either

66KC

Tape

Adapters

or

66KC

Dual

Tape

Channels.

Reading

is

performed

in

either

the

forward

or

reverse

direction.

The

read/write

rate

is

approximately

66,667

alpha-

numeric

characters

per

second.

Up

to

14

66KC

Tape

Stations

may

be

operated

in

the

system.

The

Multiple

Tape

Lister,

Model

340,

is

an

electro-mechanical

printer

available

in

two

models.

The

first

model

has

6

separate

paper

feed

units

and

the

second

has

12

separate

paper

feed

units.

The

maximum

printing

rate

is

2,000

lines

per

minute.

Printing

can

take

place

on

any

one

listing

tape

or

a

maximum

of

two

listing

tapes

simultaneously.

1-3

The

Data

Exchange

Control,

Model

377,

enables

any

two

30i

Processors,

each

equipped

with

this

control

to

communicate

with

each

other.

A

second

Data

Exchange

Control

may

be

attached

to

a

301

Processor

when

it

is

necessary

for

this

Processor

to

communicate

with

two

other

301

Processors.

Data

may

be

transmitted

in

either

direction

but

in

only

one

direction

at

a

time.

The

transfer

rate

is

dependent

upon

the

mode

in

which

the

transfer

is

made

and

the

availability

of

status

levels

in

both

Processors.

Communications

equipment

may

be

included

in

a

system

via

the

Communications

Mode

Control, Model

378.

A

supplementary

programmers'

reference

manual

(#93-16-006)

is

available

for

use

in

programming

this

equipment.

The

Videoscan

Document

Reader,

Model

5820,

is

a

high-speed

numeric

optical

character

reader

which

will

read

documents

of

various

sizes

containing

numeric

data

and/or

four

special

symbols.

The

data

is

translated

auto-

matically

for

input

to

the

Processor.

The

reading

rate

is

either

750

documents

per

minute

or

1500

documents

per

minute

as

determined

by

a

manual

switch

setting.

A

supplementary

programmers'

reference

manual

(#93-16-004)

is

available

for

use

in

programming

this

equipment.

Two

additional

301

Processor

models

are

available.

The

memory

capacity

is

20,000

(Model

354)

or

40,000

(Model

355)

alphanumeric

characters.

In

addition

to

the

standard

301

System

programming

instructions,

the

enhanced

logic

of

these

processors

provide

high

speed

fixed

point

or

floating

point

arithmetics

with

associated

auto-

matic

address

modification

capabilities.

A

supplementary

programmers'

reference

manual

(#93-16-003)

is

available

for

use

in

programming

this

equipment.

Accuracy

Control

Adequate

accuracy

checking

techniques

are

used

in

the

System

to

assure correct

data

processing.

Correct

parity

is

ascertained

on

read-in,

during

data

flow

in

the

Computer,

and

on

write-outs.

If

a

parity

error

occurs

in

one

of

the

Computer

modes

(Normal,

Simultaneous

or

Data

Record

File)

the

mode

in

which

the

error

occurs

is

stopped

immediately.

The

other

modes

complete

their

function.

Accuracy

of

information

from

the

Card

Reader

and

to

the

Card

Punch

is

assured

by

use

of

two

separate

reading

stations

in

the

Card

Reader,

and

a

reading

station

following

the

punch

unit

in

the

Card

Punch.

When

reading

cards

in

the

Translate

Mode

of

operation,

any

non-RCA

301

Card

Code

combination

(excluding

Y/0)

is

detected,

trans-

ferred

into

memory

as

an

octal

57

(578),

and

both

the

Computer

and

Card

Reader

halt

after

the

complete

card

image

has

been

transferred

to

m

A

parity

check

is

made

of

paper

tape

characters

(odd

or

even

input

parity)

when

transferred

to

the Computer,

and

an

echo

check

is

made

of

those

characters

punched

onto

paper

tape.

With

the

unbuffered

printer,

a

read

error

condition

(RE)

is

indicated

when

the

printer

table

character

stored

in

the control

module

for

scanning

the

print

field

has

a

parity

error.

With

the

buffered

printer,

RE

is

indicated

for

a

parity

error

on transfer

into

the

buffer.

With

the

unbuffered

printer,

a

write

error

condition

(WE)

is

indicated

when

either

of

the

characters

in

the

diad

sent

to

the

Printer

Control

module

for

comparison

has

a

parity

error.

With

the

buffered

printer,

WE

indicates

detection

of

an

off-line

(printer

accessing

buffer)

parity

error.

WE

indication

occurs

on

the

next command

to

the

printer.

A

DDF

occurs

if

the

device

is

inoperable

or

a

line

advance

or

a

page

change

command

is

received

when

a

low

paper

supply

exists.

The

Data

Record

File

possesses

a

lock-out

feature

to

prevent

writing

on

a

"master"

record.

An

accuracy

check

also

warns

of

malfunctioning

Block

or

Character

Counter.

The

Data

Disc

File

checks

if

the

positioner

is

in

the

correct

track,

and

it

has

a

bit

counter

to

assure

that

the

bit-serial

to

character-serial

conversion

is

functioning

properly.

If

a

character

with

faulty

parity

is

read,

an

octal

57

(57g)

will

be

stored

in

memory

in

place

of

the

faulty

character

and

an

indicator

will

be set

which

can

be

sensed

at

the

termination

of

the

read

instruction.

Magnetic

Tape

accuracy

features

include

end

of

reel

stops,

both

beginning

of

tape

and

end

of

tape

warning,

dual

recording,

write

lockouts,

correct

parity

of

data

read

and

read

after

write

accuracy

check.

A

parity

check

is

performed

on

data

received

from

the

Interrogating

Typewriter.

When

operated

as

an

output

device,

an

echo

check

for

correct

parity

is

performed

between

the

typewriter

and

the

control

module.

1-4