Computer Hardware

70/46

RCA 70/46 User Manual

260 pages

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ORGANIZATION

OF

DATA

Bit

Byte

Halfword

Word

Doubleword

Item/Field

Record

DATA

FORMATS

NUMBERING

SYSTEM

Introduction

•

The

following definitions describe

the

various levels

of

data

organiza-

tion

for

the

70/46

Processor:

• A

bit

is a single

binary

digit

having

the

value

of

either

zero

or

one.

• A

byte

consists

of

eight

information

bits.

It

represents

two decimal

digits, one alphabetic

character,

or

one special symbol.

• A

halfword

consists

of

two

consecutive bytes

beginning

on a

main

memory location

that

is a multiple

of

two.

• A word consists

of

four

consecutive bytes

beginning

on a

main

memory

location

that

is

a mUltiple

of

four.

• A doubleword consists

of

eight

consecutive bytes

beginning

on a

main

memory

location

that

is a multiple

of

eight.

•

An

item/field consists

of

any

number

of

bytes

that

specify a

particular

unit

of

information

(numeric

field, alphabetic name,

street

address, stock

number,

etc.).

• A record consists

of

one

or

more

related items.

• The basic

unit

of

information

in

the

70/46

Processor

is a byte, which

is

the

smallest addressable unit. A

byte

consists

of

eight

information

bits.

The

parity

bit

ensures

the

accuracy

of

all bytes accessed

by

the

processor.

Odd

parity

is used

in

the

70/46

Processor.

The

internal

code

representation

in

the

70/46 is

either

the

Extended

Binary-Coded-Decimal

Interchange

Code

(EBCDIC)

or

the

USA

Standard

Code

for

Information

Interchange

(USASCII)

as

specified

by

program.

(See Appendices D

and

E.)

There

are

eight

distinct

formats

for

data

in

main

memory (see figure

1).

Further

explanation

of

each

format

appears

in

the

instruction

sections

of

this

manual.

• Since

binary

addresses

are

cumbersome to

work

with,

the

hexadecimal

numbering

system

has

been adopted to

represent

characters

and

addresses

in

the

70/46

Processor. The hexadecimal

system

has

a

base

of

16. The

first

ten

marks

are

represented

by decimal

numbers

zero

(0)

through

nine

(9);

the

last

six

marks

are

represented

by

the

letters

A

through

F.

The

basic hexadecimal

marking

system

and

its

binary

and

decimal

equivalent

are

specified

in

table

1.

(See Appendix

H.)

Table

1. Basic

Hexadecimal

Marking System

Hexadecimal

Binary

Decimal Hexadecimal

Binary

Decimal

(Base

16)

(Base

21

(Base 10) (Base

16)

(Base 2) (Base

10)

0

0000

0 8

1000

8

1

0001

1 9

1001

9

2

0010

2 A

1010

10

3

0011

3

B

1011

11

4

0100

4

C

1100

12

5

0101

5

D

1101

13

6

0110

6

E

1110

14

7

0111

7

F

1111

15

3

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Training Manual63 pages

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RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English

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