Atari 400 Field Service Manual

400
ANY VIDEO
TROUBLESHOOTING
TAH:
Swsp-^ut A301 and
A302. oa
CPU Boarti
YES
Ooma
scre«n look
Uka
Figure
3-5
Go to
KEYBOARD.
Page
5-22
YES
NO
Swap
CPU
Board
Do«a aervan look
Uka
Figure
3-6
Trace
color circuitry
oa CPU Board.
Make
cetain to cheek
color
delay circuit
and a309
YES
NO
Swap-out
Alll. Q107
on Motherboard
Oo«9 screan
look
Go to KEYBOARD,
Page
5-22
Uka F gure
3-5
NO
Co to
next page
ATARI
Home
Computer
5-19

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)