Atari 400 Field Service Manual

400 TONE TEST (cont)
la there
a frequency
shift
as the
frequency
of the
tone lowers
and amplitude
decays
to Ov
SCOPE;
TTT/Div,
.5mS/0iv
SYNCj
+
CHI
NO
YES
Presa
J and
RETURN
Is the
screen black
with
no sound
NO
YES
P^'ess
SPACE
BAR
Did
you hear
a
single teat
tone
NO
This
re-runs
the
first
two
steps
of this
teat
Go to 0, next page
YES
Press
SYSTEM
RESET,
T. RETURN,
1. and RETURN
PASS
NO
YES
Go
to
CONSOLE
SWITCH
TEST,
Page
5-28
CaU
ATARI
Tech
Line-
Specialist I
Inside
California
|
(800)
672-1466
Outside
California
(800)
53a-1535
(800) 538-1536
ATARI
Home
Computer
5-25

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)