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Atari Super Breakout User Manual

Atari Super Breakout
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MPU
C3
HORIZONTAL
A VERTICAL
SIGNALS
ADDRESS
______
__
PLAYFIELD
RAM
BUS_-.........-..
AO
-A9
I
<1>2---_J
F3,H3,J3,K3
F4,H4,J4,K4
_..,___-/
ADDR
8-BIT
LATCH
FS,LS
CLK
<1>2
DISPLAY 0-5
4V
2V
1V
(ADDR
3-8)
DOUT
PLAYFIELD
ROM
P4,R4
ADDR2
ADDR1
ADDRO
8-BIT
SHIFT
REGISTER
R3
PLAYFIELD VIDEO
(TO VIDEO SUMMING
CIRCUIT)
Figure
3-10
Playfield Generator Block Diagram
E.
PLAYFIELD
GENERATOR
(See
Figure
3-3,
Sheet
4
of
5)
The
playfield
generator
generates
both
the
al-
phanumeric
and
playfield
data
for
the
TV
monitor
display. The
video
is
actually
generated
by
graphics
ROMs
P4
and
R4
and
8-bit
shift
register
R3.
See Figure
3-10.
Which
alphanumeric
or
playfield
characters are
to
be
displayed
and
where
on
the
screen
they
are
to
be
placed is
controlled
by
the
MPU
Display RAM (F4,
H4,
J4,
K4,
F3,
H3,
J3,
K3). To unde.rstand
how
MPU-
generated
data
in
the
display
RAM
controls
place-
ment
of
these characters,
it
is
first
necessary
to
un-
derstand
the
organization
of
the
playfield
display
it-
self. The
playfield
is
structured
as
a
32
x
32
matrix,
consisting
of
32
horizontal
rows
of
characters-each
row
being32
characters
wide.
(Actually,
only28
of
the
32
rows
of
characters are
visible
on
the
screen, since
3
-10
Super Breakout
the
bottom
four
rows
are
blanked
out
by
the
V
BLANK* signal
during
the
vertical
blanking
and re-
trace
period.)
Each
character
is
structured
as
an 8 x 8
block,
eight
lines
high
with
eight
bits
of
data
per
line.
See
Figure 3-11.
Since
there
are
32
rows
of
characters,
with
32
characters
per
row,
there
are a
total
of
1,024
(32
x
32)
positions
in
which
to
place a character. The
display
RAM consists
of
the
eight
I
Cs
mentioned
above.
Each
of
these
chips
is a
memory
size
of
1,024 addresses,
with
one
bit
of
data
per
address.
When
all
eight
of
these RAMs are
considered
as
a
group,they
have a
memory
size
of
1,024 x 8.
Because
of
the
unique
way
in
which
the
game
circuitry
is
structured,
each
of
1,024 addresses
in
the
display
RAM
corresponds
to
one
of
the
1,024
possible

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Atari Super Breakout Specifications

General IconGeneral
BrandAtari
ModelSuper Breakout
CategoryVideo Gaming Accessories
LanguageEnglish