Atari 400 Field Service Manual

TABLE
OF
CONTENTS
Section
Title
Page
INTRODUCTION
ix
1
THEORY
OF OPERATION
l-I
Overview
l-l
User Interface
1-2
*00/S00 Mechanical
Description
1-3
Motherboard 1-4
Central Processing
Unit
1-5
ROM Personality PCB 1-5
RAM PCB
1-5
Keyboard 1-6
Power
Supply 1-6
Program
Cartridge 1-6
*00/800 Electronic
Discussion 1-7
Central Processing
Unit
1-7
CPU 6502 Integrated
Circuit
1-7
Alphanumerical Television
1-S
Interface
Controller
Color Television
Interface 1-10
Adaptor
Grcphic Television
Interface
1-10
Adaptor
I/O
Decoder 1-10
Composite Video 1-10
Motherboard
Console
-
*00
l-l 1
Pot
Keyboard Integrated 1-11
Peripheral Interface
Adaptor
I
-1
1
Key-In Key-Out
Integrated 1-12
Circuit
Memory Map Decoder
1-12
I/O
Decoder
1-13
Motherboard Console
-
800
1-U
Bi-directional
Data Buffer
l-U
ROM
Personality Board
1-15
Power
Supply
1-16
ROM
Cartridge
1-17
Accessories
1-17
AC
Power Adaptor
1-17
TV
Switch Box
1-17
'BASIC
Program
Cartridge 1-17
2 SILKSCREEN
AND SCHEMATICS 2-1
3 TROUBLESHOOTING
AND TESTING 3-1
Overview
3-1
Tests
^
3-1
Equipment
Needed
3-1
Testing With
and
Without
3-2
the SALT II
Cartridge
ATARI
Home
Computer
iii

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)