Atari 400

Figure
8-1.
Joystick (X-Y
ControUer)
If
the
stick is pushed
forward
and
to the right
at the same time
(that is, in
a northeast
direction),
both
the forward
and
right keypad
ck)se simultaneously,
which
causes the
POKEY
to
see two switch
closures
happening
at once (See
Figure S-2). The
result is
that
the
object being
controlled
on the screen moves
diagonally. With
the four
keypads,
8
different
directions
can be
attained. The
pushbutton
determines whether
the keypad
beneath
it
is either
open
or closed. (Earlier models
were
spring loaded.)
ATARI
Home
Computer
8-2