Atari 800 Field Service Manual

A.
ATARI
Consumer
Product
Service
Manager
of
TehnicaJ
Support
UPGRADE
BULLETIN
number
1
mooelj
atari
*oo/xoo
computers
QATEs
May
2a, 1982
SUBJECT;
GTIA
Chip
CHANGE
DESCRIPTION:
New
units
manufactured
by Atari
contain
the
Ck-aphic
Teievision
Interface
Adapt
(GTIA)
chip on
the CPU
printed
circuit
board.
The GTIA
chip is
an
enhancement
of
the Color
Television
Interface
Adapter
(CTIA)
chip and
may
be
purchased
as
an
upgrade
to existing
units.
Part
Location
- CPU
printed
circuit
board
location A301.
INSTALLATION
PBorFnirPFS,
For
troubieshooting,
instaUation,
and
testing,
observe
warnings
or
cautions
stated
in Atari
Home
Computer
Division
MO/800
Home
Computer
System
Field
Service
ManuaL
Before
a chip
or board
is
added
to or
removed
from the
system,
power
the
system
down.
Follow
disassembly
instructions
in
*00/800
Field
Service
ManuaL
Remove
C012295
from
location
A30I
on CPU
printed
circuit
board.
Install
CO
1*805
in
location A301
on CPU
printed
circuit board.
TESTING
PROCEDURES;
Follow
standard
Test
Procedures
using Atari
Stand
Alone Ttst
(Diagnostic)
as outlined
in Atari
WO/800
Computer
System
Service
ManuaL
CONSUMER
INFORMATIONS
The GTIA
chip
adds
three
graphics
modes
accessible with
BASIC
for
a total
of eleven
different
graphics
modes
in BASIC
and 256
different
colors.
The
GTIA
chip
is
fully
compatible with
software
written to run
on
existing
CTIA
units.
Software
which
is written
to run
on the GTIA
chip
using its
enhanced
features
is not
displayed
correctly
with
CTIA
units.

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