<s>
The	O
Risc	B-Device
PC	I-Device
is	O
Acorn	O
Computers	O
's	O
RISC	O
OS/Acorn	O
RISC	O
Machine	O
computer	O
,	O
launched	O
on	O
15	O
April	O
1994	O
,	O
which	O
superseded	O
the	O
Acorn	B-Device
Archimedes	I-Device
.	O
</s>
<s>
Like	O
the	O
Archimedes	B-Device
,	O
the	O
Risc	B-Device
PC	I-Device
continues	O
the	O
practice	O
of	O
having	O
the	O
RISC	B-Operating_System
OS	I-Operating_System
operating	B-General_Concept
system	I-General_Concept
in	O
a	O
ROM	B-Device
module	O
.	O
</s>
<s>
Risc	B-Device
PC	I-Device
augments	O
the	O
ROM-based	O
core	O
OS	O
with	O
a	O
disk-based	O
directory	O
structure	O
containing	O
configuration	O
information	O
,	O
and	O
some	O
applications	O
which	O
had	O
previously	O
been	O
kept	O
in	O
ROM	B-Device
.	O
</s>
<s>
The	O
Risc	B-Device
PC	I-Device
was	O
used	O
by	O
music	O
composers	O
and	O
scorewriters	O
to	O
run	O
the	O
Sibelius	B-Device
scorewriting	O
software	O
.	O
</s>
<s>
Between	O
1994	O
and	O
2008	O
,	O
the	O
Risc	B-Device
PC	I-Device
and	O
A7000+	B-Device
were	O
used	O
in	O
television	O
for	O
broadcast	O
automation	O
,	O
programmed	O
by	O
the	O
UK	O
company	O
OmniBus	O
Systems	O
:	O
once	O
considered	O
"	O
the	O
world	O
leader	O
in	O
television	O
station	O
automation	O
"	O
and	O
at	O
one	O
point	O
automating	O
"	O
every	O
national	O
news	O
programme	O
on	O
terrestrial	O
television	O
in	O
the	O
United	O
Kingdom	O
"	O
.	O
</s>
<s>
The	O
Risc	B-Device
PC	I-Device
,	O
in	O
the	O
form	O
of	O
the	O
OmniBus	O
Workstation	O
,	O
and	O
a	O
customised	O
version	O
of	O
the	O
A7000+	B-Device
built	O
into	O
a	O
19-inch	O
rack	O
mount	O
unit	O
,	O
known	O
as	O
the	O
OmniBus	O
Interface	O
Unit	O
,	O
were	O
used	O
to	O
control/automate	O
multiple	O
television	O
broadcast	O
devices	O
from	O
other	O
manufacturers	O
in	O
a	O
way	O
that	O
was	O
unusual	O
at	O
the	O
time	O
.	O
</s>
<s>
1994	O
–	O
Risc	B-Device
PC	I-Device
600	O
launched	O
,	O
featuring	O
a	O
30MHz	O
ARM610	O
CPU	B-General_Concept
.	O
</s>
<s>
1995	O
–	O
40MHz	O
ARM710	O
CPU	B-General_Concept
upgrade	O
and	O
Risc	B-Device
PC	I-Device
700	O
model	O
launched	O
.	O
</s>
<s>
1996	O
–	O
200MHz	O
StrongARM	B-Device
CPU	B-General_Concept
upgrade	O
released	O
,	O
offering	O
a	O
five-fold	O
increase	O
in	O
raw	O
processing	O
power	O
compared	O
to	O
the	O
ARM7	O
used	O
in	O
the	O
previous	O
high-end	O
machines	O
.	O
</s>
<s>
1997	O
–	O
Acorn	O
launch	O
Acorn	O
J233	O
StrongARM	B-Device
Risc	B-Device
PC	I-Device
,	O
featuring	O
an	O
uprated	O
233MHz	O
model	O
of	O
StrongARM	B-Device
and	O
including	O
Browser	O
and	O
Java	O
software	O
.	O
</s>
<s>
1998	O
–	O
Castle	O
Technology	O
acquire	O
the	O
rights	O
to	O
continue	O
to	O
market	O
and	O
produce	O
the	O
Risc	B-Device
PC	I-Device
during	O
the	O
breakup	O
of	O
Acorn	O
Computers	O
.	O
</s>
<s>
2000	O
–	O
In	O
May	O
,	O
Castle	O
Technology	O
reveal	O
the	O
Kinetic	O
Risc	B-Device
PC	I-Device
range	O
which	O
included	O
a	O
faster	O
processor	O
card	O
with	O
onboard	O
memory	O
.	O
</s>
<s>
2001	O
–	O
Viewfinder	O
Podule	O
,	O
AGP	O
adapter	O
allows	O
the	O
use	O
of	O
IBM	O
PC	O
clone	O
AGP	O
graphics	B-Device
cards	I-Device
(	O
e.g.	O
</s>
<s>
2003	O
–	O
Castle	O
Technology	O
announce	O
the	O
end	O
of	O
production	O
and	O
sale	O
of	O
the	O
Risc	B-Device
PC	I-Device
.	O
</s>
<s>
Acorn	O
set	O
about	O
designing	O
the	O
Risc	B-Device
PC	I-Device
2	I-Device
,	O
later	O
renamed	O
to	O
Phoebe	B-Device
2100	I-Device
a	O
design	O
with	O
a	O
64MHz	O
front-side	B-Architecture
bus	I-Architecture
,	O
PCI	B-Protocol
slots	I-Protocol
,	O
and	O
a	O
yellow	O
NLX	B-Device
form-factor	O
case	O
.	O
</s>
<s>
Only	O
two	O
prototypes	O
were	O
ever	O
built	O
,	O
and	O
one	O
was	O
publicly	O
displayed	O
for	O
historical	O
interest	O
at	O
the	O
RISC	B-Operating_System
OS	I-Operating_System
2001	O
show	O
in	O
Berkshire	O
,	O
England	O
.	O
</s>
<s>
In	O
2003	O
it	O
was	O
confirmed	O
that	O
no	O
more	O
Risc	B-Device
PCs	I-Device
would	O
be	O
produced	O
.	O
</s>
<s>
However	O
RISC	B-Operating_System
OS	I-Operating_System
computers	O
based	O
on	O
other	O
ARM	B-Architecture
processors	I-Architecture
machines	O
have	O
been	O
manufactured	O
by	O
companies	O
since	O
this	O
date	O
.	O
</s>
<s>
Significantly	O
better	O
performance	O
has	O
been	O
reached	O
on	O
the	O
aged	O
Risc	B-Device
PC	I-Device
design	O
by	O
using	O
the	O
newer	O
203	O
(	O
and	O
later	O
236	O
)	O
MHz	O
StrongARM	B-Device
CPU	B-General_Concept
,	O
using	O
third-party	O
video	B-Device
cards	I-Device
,	O
overclocking	B-Application
,	O
and	O
having	O
specially-designed	O
CPU	B-General_Concept
cards	O
with	O
RAM	B-Architecture
located	O
upon	O
them	O
to	O
sidestep	O
the	O
speed	O
bottleneck	O
of	O
the	O
slow	O
system	O
bus	B-General_Concept
.	O
</s>
<s>
The	O
16MHz	O
front-side	B-Architecture
bus	I-Architecture
is	O
usually	O
recognised	O
as	O
being	O
the	O
most	O
significant	O
fault	O
of	O
the	O
computer	O
;	O
and	O
the	O
arrival	O
of	O
the	O
(	O
five	O
times	O
faster	O
)	O
StrongARM	B-Device
processor	O
in	O
1996	O
meant	O
that	O
the	O
Risc	B-Device
PC	I-Device
had	O
a	O
CPU	B-General_Concept
significantly	O
faster	O
than	O
the	O
computer	O
had	O
been	O
designed	O
for	O
.	O
</s>
<s>
In	O
2000	O
,	O
Castle	O
released	O
"	O
Kinetic	O
"	O
,	O
a	O
new	O
StrongARM	B-Device
processor	O
board	O
with	O
its	O
own	O
onboard	O
memory	O
slots	O
augmenting	O
main	O
memory	O
,	O
reducing	O
the	O
need	O
to	O
negotiate	O
the	O
slow	O
front-side	B-Architecture
bus	I-Architecture
for	O
memory	O
accesses	O
.	O
</s>
<s>
The	O
podule	O
bus	B-General_Concept
on	O
the	O
Risc	B-Device
PC	I-Device
can	O
achieve	O
a	O
maximum	O
data	O
throughput	O
of	O
approximately	O
6100KByte/s	O
.	O
</s>
<s>
It	O
is	O
32-bit	O
and	O
Risc	B-Device
PC	I-Device
predecessors	O
have	O
a	O
16-bit	O
bus	B-General_Concept
.	O
</s>
<s>
For	O
comparison	O
,	O
the	O
PCI	B-Protocol
bus	I-Protocol
,	O
which	O
was	O
available	O
in	O
systems	O
at	O
the	O
time	O
of	O
the	O
Risc	B-Device
PC	I-Device
's	O
introduction	O
,	O
is	O
over	O
20	O
times	O
faster	O
.	O
</s>
<s>
The	O
transfer	O
of	O
650MB	O
would	O
take	O
2	O
minutes	O
via	O
podule	O
,	O
compared	O
to	O
5	O
seconds	O
via	O
PCI	B-Protocol
.	O
</s>
