Fact_Sheet_17A_SPADATS_CAD_Jan1963 Fact Sheet 17A SPADATS CAD Jan1963

User Manual: Pdf Fact_Sheet_17A_SPADATS_CAD_Jan1963

Open the PDF directly: View PDF .
Page Count: 2

PHILCD

FACT

SHEET

Number

17

A,

January

1963

SPADATS CAD

COMPUTER

ACCESS

DEVICE

A

device

for

linking

the

Philco

2000

to

numerous

teletype

lines

SPADA

TS,

the

Space

Detection

and

Tracking

System,

maintains

continuously

updated

records

describing

and

locating

man-made

objects

in

space.

Stations

around

the

world

transmit

observations

over

a

communications

system

terminating

in

a

number

of

teletype

lines

at

the

USAF

SPACETRACK

Center

in

Colorado

Springs.

The

information

is

processed

and

stored

by

a

Philco

2000

Electronic

Data

Processing

System.

CAD

arranges

the

data

in

a

format

acceptable

to

the

Real-Time

System

of

the

Philco

2000.

It

also

organizes

processed

data

from

the

Philco

2000

for

transmission

by

teletype

lines

to

the

tracking

stations.

The

input

portion

of

CAD

is

called

CADI,

the

output

portion

CADO.

Both

can

handle

24

teletype

line

s.

CADI

Input

Programming

PHILeo

ASUBSIDIARYO'~~Y!?~

The

input

from

the

tracking

stations

is

punched

on

paper

tape

by

Teletype

Model 28RT

sets

at

100

words

per

minute.

CADI

reads

these

tapes

one

at

a

time

at

200

words

per

minute.

The

characters

are

converted

from

Baudot

code

to

Philco

2000

code

and

assembled

into

48-bit

words

for

the

Philco

2000.

The

most

significant

six

bits

of

the

word

identify

the

teletype

lines;

the

remainder

furnish

the

data.

The

order

to

read

data

from

CADI

is

similar

to

orders

for

other

Philco

2000

input-output

devices.

It

specifies

the

number

of

words

to

be

transmitted

-up

to

1024 -

and

the

starting

ad-

dress

where

the

data

is

to

be

stored

in

memory.

The

order

can

specify

priority

for

one

of

the

lines.

That

line

will

then

be

checked

before

any

of

the

others.

If

no

priority

is

specified,

each

channel

is

scanned

until

data

is

sensed

on

a

line.

Scanning

then

stops,

and

the

message

is

read

from

the

paper

tape.

If

the

number

of

words

requested

by

the

input

order

exceeds

the

number

of

words

in

the

message,

scanning

resumes

and

another

message

is

read

until

the

number

of

words

requested

has

been

forwarded.

Scanning

and

transmission

then

cease.

COMPUTER

DIVISION

WILLOW

GROVE,

PENNSYLVANIA

CADO

Output

Prog

ra

m mi

ng

Data

to

be

transmitted

from

the

computer

to

various

teletype

lines

is

transmitted

through

CAOO.

The

data

is

stored

in

memory,

one Baudot-code

data

character

and

a line

identifier

per

word.

Data

for

various

lines

may

be

intermingled;

the

speed

of

transmission

through

CADO

permits

simultaneous

transmission

over

all

lines.

Data

is

transferred

to

the

CADO

by

a

standard

input-output

order,

the

program

giving the

starting

location

in

memory

and

the

number

of

words

to

be

transferred.

The

SPADATS CAD

is

an

example

of

the

multiplexers

developed

by the

Philco

Computer

Division

for

connecting

the

Philco

2000

simultaneously

to

large

numbers

of

communica-

tions

lines.