Atari 400 Field Service Manual

SECTION
S
GAME
CONTROLLERS
The
following
pages contain
descriptions,
schematics,
and test
procedures
for the
four
game
controllers
used with
the Atari
*00/800
Computer
Consoles-
30YSTICK
(X-Y CONTROLLER)
Inside
each
joystick
is a small PC
board
that has 5
calculator-type
keypads
mounted on
it. Four
of these
are positioned
beneath
the
stick
in square
shaped
pattern,
and
the
fifth
is tocated
beneath
the pushbutton
(See
Figure
8-1).
When
the
stick
is pushed
forward,
the
bottom
surface
of the
stick
presses
against
the
forward
keypad,
causing it
to
"make",
thus
completing
the circuit
connected
to it. In
the
same
way,
pushing
the
stick back,
left
and right
causes
the
respective
keypad
underneath
that
position
to
close
and
complete
the
circuit.
ATARI
Home
Computer
8-1

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)