Atari Breakout - Paddle Player Controls and Paddle Generator; Sound Summing and Audio out Driver

I
remented.
These
outputs
cease
after
counter
F6
un-
derflows,
because
the
counter's
borrow
output
will
then
reset
latch
F7.
3.4.21 PADDLE
PLAYER
CONTROLS
AND
PADDLE
GENERATOR
(SHEET
2,
ZONES
A
&
B
1THROUGH4):
Each
player's
paddle
knob
is
attached
to
the
shaft
of
a
potentiometer
connected
to+
S
volts.
The
poten-
tiometer
wiper
arms
connect
to
a
type-4016
CMOS
quad
bilateral
switch.
During
a
two-player
game
on
the
cocktail
table
version
of
the
game
the
PLAYER
2
CONDITIONAL'
signal
(and its
complement
at
E9
pin
8)
controls
the
analog
switches
so
that
either
the
connection
between
D9
pins
10
and
11
is
closed
and
that
between
pins
8 and 9 is
open,
or
vice versa,
de-
pending
on
which
player
is
up.
The
upright
cabinet
version has
only
one
paddle
knob,
and
so
D9
pins
11
and
10
are
closed all
the
time.
The
paddle
potentiometers
form
part
of
the
RC
network
that
determines
the
charging
time
of
a 2.2
microfarad
capacitor
in
the
input
circuit
of
timer
C9.
The
duration
of
the
timer's
output
signal
will
deter-
mine
how
far
the
paddle
will
appear
from
the
sidewall
boundary.
During
a serve
when
the
ball
hits
the
backwall
boundary,
meaning
that
a
breakout
has
occurred
on
that
serve,
the
BTB
HIT signal
clocks
into
flip-flop
FS
and
counter
D4
is
incremented.
When
this
happens
the
paddle
size
is
reduced
to
one
half
its
normal
width.
The
PAD
signal
is
produced
at
K3
pin
8
after
gating
with
the
paddle
window
timing
signals
from
the
horizontal
sync
countdown
chain.
3.4.22 NUMERALS DISPLAY GENERATOR
(SHEET
2, ZONES
A
&
B 3
THROUGH
8): The type-9312
one-
of-eight
data
selector/multiplexers
NS, MS,
LS
and
KS
receive
player
score
data
(separately
for
each
player),
ball
serve
number
data
(BALL#
A,
BALL#
B,
and BALL
#C),
and
player
number
data.
All
multi-
plexers are
strobed
by
the
same
timing
signals
from
the
sync
countdown
chain.
The type-7448
device
in
JS
changes
the
BCD
format
multiplexer
outputs
into
the
7-segment
numerical
format
displayed
on
the
TV
screen. The
multiplexers
HS
and
JS
then
separate
the
7-segment data
into
horizontal
and
vertical
compo-
nents,
respectively,
so
that
the
data appears
serially
at H4
pin
11.
The
gating
configuration
shown
in
Zone
AS
generates
the
timing
window
that
determines
where
the
numerals
will
appear
on
the
screen. The
SFL
(score flash)
signal
produced
by
the
type-SSS
device
in
location
B2
causes
the
player
up's
score
to
blink
during
a play
sequence. The
resulting
SCI
signal
is
clocked
through
flip-flop
D3,
which
acts
an
inverter,
to
produce
the
SCORE
signal.
3.4.23
SOUND
SUMMING
AND
AUDIO
OUT
DRIVER
(SHEET
2,
ZONES
C
&
D 1
THROUGH
3): The
junction
of
resistors
R36
through
R38
forms
a
sum-
ming
point
for
the
signals
that
contribute
to
the
game's sounds.
R36
couples
the
signal
produced
by
gating P
HIT
SOUND
(from
the
ball
motion
coun-
ters)
with
the
pin
6'
output
of
multivibratbr
AB.
This
multivibrator
is
triggered
each
time
the
ball
hits
the
paddle. In a
similar
fashion,
R38
couples
the
signal
produced
by
gating
multivibrator
A8's
pin
10
output
with
BRICK
SOUND.
This
multivibrator
is
triggered
once
each
time
counter
F6
is
decremented,
so
that
a
separate
tick
sound
is
heard
for
every
point
value
when
the
ball
hits
a
brick.
R37
couples
the
signal
produced
by
gating
multivibrator
A7
with
VB
HIT
SOUND
so
that
the
bounce
sound
is heard
when
the
ball hits
the
backwall
or
either
sidewall
boundary.
Potentiometer
RSO
couples
the
sound
summing
point
to
the
output
drive
stage
formed
by
the
type-
LM380
amplifier
circuit.
This
potentiometer
provides
the
manual speaker
volume
adjustment
described
in
paragraph
S.3
of
Section
V
of
this
man·ual.