Name: Atari 800
Brand: Atari
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INPUT/OUTPUT

DEVICES

INPUT/OUTPUT

COMMANDS

AND

DEVICES

This

section

describes

the

input

output

devices

and

how

data

moved

between

them.

The

commands

explained

this

section

are

those

that

allow

access

the

input

output

devices.

The

input

commands

are

those

associated

with

getting

data

into

the

RAM

and

the

devices

geared

for

accepting

input

The

output

com-

mands

are

those

associated

with

retrieving

data

from

RAM

and

the

devices

geared

for

generating

output

The

commands

described

this

section

are:

CLOAD

CSAVE

DOS

ENTER

INPUT

LOAD

LPRINT

NOTE

OPEN

POINT

PUT

GET

READ

DATA

SAVE

STATUS

XIO

The

hardware

configuration

each

the

following

devices

illustrated

the

individual

manuals

furnished

with

each.

The

Central

Input/Output

(CIO)

sub-

system

provides

the

user

with

single

interface

access all

the

system

peripheral

devices

a (largely)

independent

manner.

This

means

there

single

entry

point

and

device-independent

calling

sequence.

Each

device

has

symbolic

device

name

used

identify

it;

e.g.,

for

the

keyboard.

Each

device

must

opened

before

access

and

each

must

assigned

Input/Output

Con-

trol

Block

(IOCB).

From

then

on,

the

device

referred

its

IOCB

number.

ATARI

BASIC

contains

blocks

RAM

which

identifies

the

Operating

System

the

information

needs

perform

I/0

operation.

This

information

includes

the

command,

buffer

length,

buffer

address,

and

two

auxiliary

control

variables.

ARI BASIC

sets

the

lOCH's,

but

the

user

must

specify

which

IOCB

use.

BASIC

reserves

IOCB

ItO

for

1/0

the

Screen

Editor,

therefore

the

user

may

not

request

IOCB

11'0.

The

GRAPHICS

statement

(see Section

opens

IOCB

11'6

for

input

and

output

the

screen.

(This

the

graphics

window

S:).

IOCB

11'7

used

BASIC

for

the

LPRINT, CLOAD,

and

CSA

commands.

The

IOCB

number

may

also

referred

the

device

(or

file)

number.

IOCB's 1

through

are

use.d

opening

the

other

devices

for

input/output

operations.

IOCB

11'7

use,

will

prevent

LPRINT

some

the

other

BASIC

I/0

statements

from

being

performed.

Keyboard:

(K:)

Input

only

device.

The

keyboard

allows

the

user

read

the

converted

(ATASCII)

keyboard

data

each

key

pressed.

Line

Printer:

(P:)

Output

only

device.

The

line

printer

prints

ATASCII

characters,

line

time.

recognizes

control

characters.

Program

Recorder:

(C:)

Input

and

Output

device.

The

recorder

is a

read/write

device

which

can

used

either,

but

never

both

simultaneously.

The

cassette

has

two

track

for

sound

and

program

recording

purposes.

The

audio

track

cannot

recorded

from

the

ATARI

system,

but

may

pla

back

through

the

television

speaker.

I/0

Commands

and

Devic

Other manuals for Atari 800

Users Handbooks326 pages

Service Manual129 pages

Operator's Manual30 pages

User Guide244 pages

Owner's Manual8 pages

Instruction Manual90 pages

Field Service Manual207 pages

Owner's Guide11 pages

Hardware Manual113 pages

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Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS