<s>
The	O
HuC6280	B-General_Concept
8-bit	O
microprocessor	B-Architecture
is	O
Japanese	O
company	O
Hudson	O
Soft	O
's	O
improved	O
version	O
of	O
the	O
WDC	B-General_Concept
65C02	I-General_Concept
CPU	B-General_Concept
,	O
an	O
upgraded	O
CMOS	O
version	O
of	O
the	O
popular	O
NMOS-based	O
MOS	B-General_Concept
Technology	I-General_Concept
6502	I-General_Concept
8-bit	O
CPU	B-General_Concept
,	O
manufactured	O
for	O
Hudson	O
by	O
Seiko	O
Epson	O
and	O
NEC	O
.	O
</s>
<s>
The	O
most	O
notable	O
product	O
using	O
the	O
HuC6280	B-General_Concept
is	O
NEC	O
's	O
TurboGrafx-16	B-General_Concept
video	B-Device
game	I-Device
console	I-Device
.	O
</s>
<s>
The	O
HuC6280	B-General_Concept
contains	O
a	O
65C02	B-General_Concept
core	O
which	O
has	O
several	O
additional	O
instructions	O
and	O
a	O
few	O
internal	O
peripheral	O
functions	O
such	O
as	O
an	O
interrupt	B-Architecture
controller	I-Architecture
,	O
a	O
memory	B-General_Concept
management	I-General_Concept
unit	I-General_Concept
,	O
a	O
timer	O
,	O
an	O
8-bit	O
parallel	O
I/O	O
port	O
,	O
and	O
a	O
programmable	O
sound	O
generator	O
(	O
PSG	O
)	O
.	O
</s>
<s>
A	O
slightly	O
revised	O
HuC6280A	O
was	O
released	O
and	O
used	O
in	O
the	O
PC	B-General_Concept
Engine	I-General_Concept
CoreGrafx	O
and	O
SuperGrafx	B-General_Concept
.	O
</s>
<s>
The	O
HuC6280	B-General_Concept
has	O
a	O
64	O
KB	O
logical	B-General_Concept
address	I-General_Concept
space	O
,	O
but	O
a	O
2	O
MB	O
physical	O
address	O
space	O
.	O
</s>
<s>
The	O
HuC6280	B-General_Concept
uses	O
a	O
Memory	B-General_Concept
Management	I-General_Concept
Unit	I-General_Concept
that	O
splits	O
the	O
memory	O
space	O
into	O
segments	B-General_Concept
of	O
8	O
KB	O
.	O
</s>
<s>
Each	O
logical	O
8	O
KB	O
segment	B-General_Concept
is	O
associated	O
with	O
one	O
of	O
256	O
physical	O
8	O
KB	O
sized	O
segments	B-General_Concept
.	O
</s>
<s>
This	O
can	O
be	O
set	O
up	O
with	O
an	O
8-bit	O
register	O
(	O
MPR0-7	O
)	O
that	O
contains	O
the	O
most	O
significant	O
eight	O
bits	O
of	O
the	O
address	O
of	O
the	O
8	O
KB	O
segment	B-General_Concept
in	O
physical	O
memory	O
.	O
</s>
<s>
Frequency	B-Application
modulation	I-Application
takes	O
this	O
one	O
step	O
further	O
,	O
allowing	O
the	O
playback	O
frequency	O
to	O
be	O
dynamically	O
adjusted	O
according	O
to	O
a	O
specified	O
pattern	O
.	O
</s>
<s>
Inevitably	O
,	O
this	O
requires	O
more	O
programming	O
effort	O
and	O
CPU	B-General_Concept
time	O
.	O
</s>
