Atari 400 Field Service Manual

Proper operation
of the unit
is indicated by you being
able to
make
this
adjustment
and
by
consistent color
within
the
entire span of each bar on
the screen. Minor
glitches
on
the edges of the color bars
are acceptable. Leave this
test on for
at least 60
seconds
in order
to catch any intermittent
problems, such
as a
bar
momentarily
changing
colors or blanking out.
Any
Video Test
This test
verifies
the console's
ability
to generate
a video (TV)
display.
This
test also
checks
for pattern sensitivity
of the rvNTIC
chip.
By
entering
the command
letter A
and pressing RETURN,
this test
is activated.
Figure
3-5
illustrates the
screen display
for the Any Video
Test.
NOTE:
Figure
3-5
is
a black
and
white
representation
of a colored
screen.
The
screen
should have
a black background
with
eight
vertical
bars. Half
of
the
vertical
bars
should
be narrow,
and the other
half, much
wider.
A
horizontal
bar
should
appear
across the
top of the
screen. From
the left
to right,
the shade
of color
on the
horizontal bar
should
change. On
the
right of the
bar, two Vs
should
be
displayed,
right
side
up; one in
normal video
and the
other in
inverse video.
Figure 3-5.
Any
Video
Test
Screen
ATARI
Home
Computer
3-7

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)