Atari 400 Field Service Manual

At
the
end of the
BURN-IN
period, check
the
unit
again for
any
malfunctions,
using
SALT
II Test
checks.
Once the
unit
has passed
all
the final
checkout
procedures,
it
is
ready to be
returned
to the
customer.
DESCRIPTION
OF THE
OTHER
FUNCTIONS
FOLLOWS;
Production Test
Command
letter "Z".
This
function
allows
you
to run
through
the
series
of test
semi-
automatically
by pressing
the
space
bar. It
will
ask
you the
serial
number
of the
unit
and print
it
out on
a printer with
the word PASS
or FAIL.
Soot
B
This
function
is
not used
at
this time.
Examine
Command
letter
"E".
This
allows
you to
test
a
specified RAM
location
(address).
Adjust
Command
letter
"3".
This
is
used to
debug
audio
and serial
port
control
lines
(Motor
?..
£°"^^and)
on the
system
console.
A
fixed
frequency
audio
signal
is
produced
while PIA
ports
are
exercised.
SUMMARY
This
section
has
taken
you
step-by-step
through
aU the
tests
and
general
troubleshooting
steps
required
for
evaluation
of
a suspect
defective
*00/800
console
Now
read
through
the
section,
DISASSEMBLY
and ASSEMBLY,
before
going
on to
Section
5,
Diagnostic
Flowcharts,
and
Section
7,
800
Diagnostic
Flowchart.
ATARI
Home
Computer
3-17

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)