<s>
Titan	B-Device
was	O
the	O
prototype	O
of	O
the	O
Atlas	B-Device
2	O
computer	O
developed	O
by	O
Ferranti	O
and	O
the	O
University	O
of	O
Cambridge	O
Mathematical	O
Laboratory	O
in	O
Cambridge	O
,	O
England	O
.	O
</s>
<s>
In	O
1961	O
,	O
the	O
University	O
of	O
Cambridge	O
found	O
itself	O
unable	O
to	O
fund	O
a	O
suitably	O
powerful	O
computer	O
for	O
its	O
needs	O
at	O
the	O
time	O
,	O
so	O
the	O
University	O
purchased	O
from	O
Ferranti	O
the	O
main	O
Atlas	B-Device
processing	O
units	O
and	O
then	O
jointly	O
designed	O
the	O
memory	O
and	O
peripheral	O
equipment	O
.	O
</s>
<s>
The	O
joint	O
effort	O
led	O
to	O
a	O
cheaper	O
and	O
simpler	O
version	O
of	O
the	O
Atlas	B-Device
that	O
Ferranti	O
could	O
market	O
,	O
leaving	O
Cambridge	O
with	O
the	O
prototype	O
version	O
,	O
named	O
Titan	B-Device
.	O
</s>
<s>
The	O
Atlas	B-Device
hardware	O
arrived	O
in	O
Cambridge	O
in	O
1963	O
,	O
although	O
software	O
design	O
was	O
already	O
underway	O
.	O
</s>
<s>
In	O
1965	O
the	O
Cambridge	O
side	O
of	O
the	O
team	O
decided	O
to	O
add	O
a	O
time-sharing	B-General_Concept
facility	O
for	O
Titan	B-Device
,	O
necessitating	O
the	O
acquisition	O
of	O
additional	O
hardware	O
.	O
</s>
<s>
When	O
Titan	B-Device
came	O
into	O
full	O
service	O
in	O
1966	O
,	O
time	B-General_Concept
sharing	I-General_Concept
was	O
available	O
for	O
all	O
staff	O
.	O
</s>
<s>
Titan	B-Device
was	O
finally	O
switched	O
off	O
in	O
October	O
1973	O
.	O
</s>
<s>
Ferranti	O
,	O
by	O
then	O
a	O
division	O
of	O
International	O
Computers	O
and	O
Tabulators	O
(	O
ICT	O
)	O
,	O
marketed	O
the	O
Titan	B-Device
as	O
the	O
Atlas	B-Device
2	O
.	O
</s>
<s>
Although	O
intended	O
to	O
be	O
more	O
affordable	O
than	O
the	O
Atlas	B-Device
,	O
its	O
price	O
was	O
still	O
over	O
£1	O
million	O
.	O
</s>
<s>
A	O
second	O
Atlas	B-Device
2	O
was	O
built	O
in	O
Manchester	O
,	O
and	O
was	O
installed	O
at	O
the	O
Computer-Aided	O
Design	O
Centre	O
(	O
CADCentre	O
)	O
on	O
Madingley	O
Road	O
together	O
with	O
the	O
Cambridge	O
Titan	B-Device
supervisor	O
.	O
</s>
<s>
This	O
machine	O
,	O
the	O
last	O
Atlas	B-Device
,	O
was	O
finally	O
switched	O
off	O
on	O
21	O
December	O
1976	O
.	O
</s>
<s>
A	O
third	O
Atlas	B-Device
2	O
was	O
ordered	O
by	O
the	O
UK	O
's	O
Atomic	O
Weapons	O
Research	O
Establishment	O
(	O
AWRE	O
)	O
at	O
Aldermaston	O
.	O
</s>
<s>
It	O
replaced	O
the	O
faster	O
and	O
much	O
more	O
expensive	O
IBM	B-Device
7030	I-Device
Stretch	I-Device
which	O
had	O
been	O
leased	O
from	O
IBM	O
.	O
</s>
<s>
Titan	B-Device
differed	O
from	O
the	O
original	O
Manchester	B-Device
Atlas	I-Device
by	O
having	O
a	O
real	O
,	O
but	O
cached	O
,	O
main	O
memory	O
,	O
rather	O
than	O
the	O
paged	O
(	O
or	O
virtual	O
)	O
memory	O
used	O
in	O
the	O
Manchester	O
machine	O
.	O
</s>
<s>
The	O
Titan	B-Device
's	O
main	O
memory	O
had	O
128K	O
of	O
48-bit	O
words	O
and	O
was	O
implemented	O
using	O
ferrite	O
core	O
store	O
rather	O
than	O
the	O
part	O
core	O
,	O
part	O
rotating	O
drum-store	B-General_Concept
used	O
on	O
the	O
Manchester	B-Device
Atlas	I-Device
.	O
</s>
<s>
Titan	B-Device
also	O
had	O
two	O
large	O
hard-disk	O
drives	O
and	O
several	O
magnetic	O
tape	O
decks	O
.	O
</s>
<s>
As	O
with	O
the	O
Manchester	B-Device
Atlas	I-Device
,	O
it	O
used	O
discrete	O
components	O
,	O
in	O
particular	O
germanium	O
transistors	B-Application
.	O
</s>
<s>
Titan	B-Device
was	O
the	O
computer	O
on	O
which	O
a	O
team	O
from	O
Ferranti	O
based	O
in	O
Bracknell	O
working	O
with	O
David	O
Barron	O
,	O
David	O
Hartley	O
,	O
Roger	O
Needham	O
and	O
Barry	O
Landy	O
of	O
Cambridge	O
University	O
Maths	O
Lab	O
developed	O
the	O
early	O
multi-user	O
time-sharing	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
called	O
Titan	B-Device
Supervisor	O
.	O
</s>
<s>
This	O
was	O
arguably	O
the	O
world	O
's	O
first	O
commercially	O
sold	O
time-sharing	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Other	O
experiments	O
in	O
time-sharing	B-General_Concept
,	O
such	O
as	O
CTSS	B-Operating_System
and	O
PLATO	B-Operating_System
in	O
the	O
US	O
,	O
were	O
one-of-a-kind	O
research	O
projects	O
.	O
</s>
<s>
One	O
of	O
Titan	B-Device
's	O
most	O
intensive	O
uses	O
was	O
to	O
compute	O
the	O
inverse	O
Fourier	B-Algorithm
Transforms	I-Algorithm
of	O
data	O
from	O
the	O
One-Mile	O
Radio	O
Telescope	O
.	O
</s>
