<s>
The	O
NEC	B-Device
μPD7720	I-Device
is	O
the	O
name	O
of	O
fixed	O
point	O
digital	B-Architecture
signal	I-Architecture
processors	I-Architecture
from	O
NEC	O
(	O
currently	O
Renesas	O
Electronics	O
)	O
.	O
</s>
<s>
Announcements	O
for	O
the	O
first	O
"	O
real	O
"	O
DSPs	O
,	O
the	O
NEC	B-Device
μPD7720	I-Device
and	O
the	O
Bell	O
Labs	O
DSP-1	O
chip	O
,	O
occurred	O
the	O
following	O
year	O
at	O
the	O
1980	O
IEEE	O
International	O
Solid-State	O
Circuits	O
conference	O
.	O
</s>
<s>
The	O
μPD7720	B-Device
first	O
became	O
available	O
in	O
1981	O
and	O
commercially	O
available	O
in	O
late	O
1982	O
at	O
a	O
cost	O
of	O
US$600	O
each	O
(	O
approx	O
.	O
</s>
<s>
Detailed	O
descriptions	O
of	O
the	O
μPD7720	B-Device
architecture	O
are	O
found	O
in	O
Chance	O
(	O
1990	O
)	O
,	O
Sweitzer	O
(	O
1984	O
)	O
and	O
Simpson	O
(	O
1984	O
)	O
.	O
</s>
<s>
Briefly	O
,	O
the	O
NEC	B-Device
μPD7720	I-Device
runs	O
at	O
4MHz	O
frequency	O
with	O
128-word	O
data	O
RAM	O
,	O
512-word	O
data	O
ROM	O
,	O
and	O
512-word	O
program	O
memory	O
,	O
which	O
has	O
VLIW-like	O
instruction	O
format	O
,	O
enabling	O
all	O
of	O
ALU	B-General_Concept
operation	O
,	O
address	O
register	O
increment/decrement	O
operation	O
,	O
and	O
move	O
operation	O
in	O
one	O
cycle	O
.	O
</s>
<s>
The	O
NEC	O
μPD77C25	O
,	O
which	O
succeeded	O
the	O
μPD7720	B-Device
,	O
runs	O
at	O
8MHz	O
frequency	O
with	O
256-word	O
data	O
RAM	O
,	O
1,024	O
-word	O
data	O
ROM	O
,	O
and	O
2,048	O
-word	O
program	O
memory	O
.	O
</s>
