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VECTOR

4

TECHNICAL

INFORMATION

PART

II-

THEORY

OF

OPERATION

The

Theory

of

Operation

will

discuss

each

functional

portion

of

the

Vector

4

Computer.

This

includes

a

detailed

analysis

of

the

nine

functional

systems:

[

RAM/PROM

Memag

ideg

R

Q,

Keyboard,

Disk

Controller,

Disk

Drives

and

Power

Supply.

The

Vector

4

Block

Diagram

(Exhibit

II-1)

shows

how

all

nine

systems

inter-relate.

The

following

section

gives

a

brief

deseription

of

each

system:

CPU

The

CPU

System

provides

the

intelligence

and

clocking

mechanism

of

the

Vector

4.

This

is

accomplished

through

development

of

two

timing

cycles:

VIDEO

and

CPU.

Implementation

of

these

cycles

allow

the

CPU

and

the

Video

Systems

to

access

the

same

block

of

memory

at

different

and

equal

intervals.

RAM/PROM

Memory

This

system

consists

of

RAM

and

PROM

memory.

The

CPU

System

(multiplexing

portion)

controls

the

addressing,

reading

and

writing

to

this

system.

Video

This

system

which

is

located

on

the

SBC

translates

Vector

4

computer

signals

into

various

types

of

video

displays.

The

Video

Subsystem

uses

the

memory

located

in

the

RAM/PROM

System

to

achieve

its

video

displays.

CRT

|

The

CRT

System

consists

of

the

Video

Board

and

CRT.

It

|

takes

the

video

and

associated

control

signals

from

the

Video

System

and

uses

them

to

display

video

information

on

the

CRT.

I/0

The

I/0

System

has

ports,

expansion

slots

and

various

decoding

devices.

It

provides

the

interface

for

the

Disk

Controller

System,

Keyboard

System

and

other

I/O

devices.

Keyboard

The

Keyboard

System

consists

of

a

separate

unit

which

is

used

by

the

user

to

key-in

numbers,

alphanumeric

data

or

other

type

of

computer

information.

Disk

Controller

The

Disk

Controller

System

is

a

separate

PCB

which

-

provides

the

interface

between

the

Disk

Drives

and

the

Single

Board

Computer.

Disk

Drives

This

system

provides

the

peripheral

storage.

Power

Supply

The

Power

Supply

System

routes

the

correct

form

of

power

|

to

all

the

computer

systems.

|

09-01-82

7200-0001

IIA-1