<s>
Atari	B-Application
System	I-Application
refers	O
to	O
two	O
arcade	O
system	O
boards	O
introduced	O
in	O
1984	O
for	O
use	O
in	O
various	O
arcade	O
games	O
from	O
Atari	O
Games	O
.	O
</s>
<s>
Two	O
versions	O
of	O
the	O
board	O
were	O
released	O
,	O
Atari	B-Application
System	I-Application
1	I-Application
and	O
Atari	B-Application
System	I-Application
2	I-Application
.	O
</s>
<s>
The	O
Atari	B-Application
System	I-Application
1	I-Application
was	O
Atari	O
Games	O
 '	O
first	O
upgradeable	O
arcade	O
game	O
hardware	O
platform	O
.	O
</s>
<s>
Relief	B-Application
Pitcher	I-Application
(	O
unreleased	O
prototype	O
)	O
-	O
Atari	O
Games	O
released	O
a	O
different	O
game	O
titled	O
Relief	B-Application
Pitcher	I-Application
in	O
1992	O
which	O
used	O
completely	O
different	O
hardware	O
.	O
</s>
<s>
The	O
hardware	O
used	O
a	O
large	O
circuit	O
board	O
with	O
a	O
Motorola	B-Device
68010	I-Device
main	O
CPU	O
running	O
at	O
7.159MHz	O
,	O
a	O
MOS	B-General_Concept
Technology	I-General_Concept
6502	I-General_Concept
sound	O
CPU	O
running	O
at	O
1.789MHz	O
,	O
a	O
system	O
ROM	B-Device
,	O
text	O
and	O
graphics	O
display	O
hardware	O
,	O
and	O
control	O
interfaces	O
.	O
</s>
<s>
Two	O
large	O
edge-card	O
connectors	O
allowed	O
a	O
"	O
cartridge	O
board	O
"	O
to	O
be	O
plugged	O
in	O
;	O
the	O
cartridge	O
board	O
supplied	O
the	O
main	O
program	O
ROMs	O
,	O
sound	O
program	O
ROMs	O
,	O
graphics	O
ROMs	O
,	O
graphics	O
shift	O
registers	O
,	O
a	O
"	O
SLAPSTIC	O
"	O
copy	O
protection	O
chip	O
,	O
a	O
Yamaha	O
YM2151	O
FM	O
sound	O
generator	O
,	O
a	O
POKEY	B-Device
and	O
(	O
for	O
some	O
games	O
)	O
TI	O
TMS5220	B-Application
LPC	B-Algorithm
speech	B-Application
synthesis	I-Application
chip	O
.	O
</s>
<s>
Converting	O
one	O
System	O
1	O
game	O
into	O
another	O
generally	O
required	O
replacing	O
the	O
cartridge	O
board	O
,	O
attraction	O
marquee	O
,	O
control	O
panel	O
,	O
and	O
in	O
some	O
cases	O
installing	O
additional	O
controls	O
(	O
e.g.	O
,	O
foot	O
pedal	O
for	O
Road	B-Application
Blasters	I-Application
)	O
.	O
</s>
<s>
Several	O
games	O
(	O
most	O
notably	O
Gauntlet	B-Device
and	O
Gauntlet	B-Application
II	I-Application
)	O
used	O
hardware	O
that	O
was	O
electrically	O
very	O
similar	O
to	O
System	O
1	O
,	O
but	O
implemented	O
on	O
a	O
single	O
board	O
rather	O
than	O
using	O
a	O
cartridge	O
board	O
.	O
</s>
<s>
Very	O
soon	O
after	O
the	O
introduction	O
of	O
the	O
Atari	B-Application
System	I-Application
1	I-Application
,	O
the	O
Atari	B-Application
System	I-Application
2	I-Application
was	O
introduced	O
.	O
</s>
<s>
The	O
EPROMs	B-General_Concept
were	O
split	O
between	O
both	O
boards	O
.	O
</s>
<s>
The	O
main	O
CPU	O
was	O
a	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
T-11	B-Device
microprocessor	B-Architecture
running	O
at	O
10MHz	O
.	O
</s>
<s>
The	O
sound	O
CPU	O
was	O
a	O
MOS	B-General_Concept
Technology	I-General_Concept
6502	I-General_Concept
running	O
at	O
1.789MHz	O
,	O
and	O
the	O
sound	O
chips	O
used	O
were	O
a	O
Yamaha	O
YM2151	O
running	O
at	O
approx	O
.	O
</s>
<s>
3.579MHz	O
,	O
2	O
POKEYs	B-Device
at	O
approx	O
.	O
</s>
<s>
1.789MHz	O
and	O
a	O
TMS5220	B-Application
running	O
at	O
625kHz	O
.	O
</s>
