Atari 400 Field Service Manual

Coior
Bar
Test
This
test verifies and allows
for adjustment
to the
color circuitry. With
SALT
II
properly
in
place,
enter
the command
letter C
and press
RETURN,
Figure
3-^
is
a
biack
and white representation of what
your television
display screen
should
look like.
REFERENCE
BAR
SAME
COLOR
Figure 3-*.
Color Bar
Test Screen
A
l5-color
rainbow
scale
is displayed
above
the
reference
bar with
a single
color bar
below.
The
color bars
directly
above
and below
the
reference
bar should
be the
same
color
(golden
rod). If
not,
proper
adjustment
of
R309
makes
the
color bars
above
and
below
the
reference
bar
identical
thus
adjusting
the coior
frequency
of the console
to
the
proper
setting.
ATARI
Home
Computer
3-6

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)