Atari 400 Field Service Manual

400 CONSOLE SWITCH
TEST
START
Press S and
RETURN
YES
?ress aach
(4)
Console
Switch
PASS
Go to ROM Test,
Page
5-29
NO
NO
,mi;
Does console
speaker
"SEEP"
when
any
Console Switch
is
pressed
Are ail9
-
R122 or
CI21
-
124 shorted
or open
YES Replace and retest
YES NO
^
YES
Replace CTIA/GTIA
(A301)
on CPU
3oard and retest
PASS
Go to ROM Test,
Page
5-29
YES
i
NO
Did
a
single
switch
fail
NO
Call
ATARI
Tech
Line
Specialist
Inside
California
(800)
672-U66
Outside
California
(800)
538-1535
(800)
538-1536
ATARI
Home
Computer
5-28

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)