Atari 400 Field Service Manual

400 TONE
TEST
(cont)
Adjust
A203
to Ch3.
verify
TV
is tuned
to
Ch3 and
fine
tuning
is
adjusted
to
a
elesr
picture
and
turn
the
volume
up
Retest
PASS
iia
YES
Re-ma
remainder
of
tone
test
for
other
three
voices
CaU
ATARI
Tech
Line
Specialist
Inside
California
(800) 672-1466
Outaide
California
(800)
538-1535
(800)
538-1536
PASS
NO
YES
Go
to
CONSOLE
SWITCH
TEST.
Page 5-28
ATARI
Home
Computer
5-27

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)