<s>
The	O
Sinclair	B-Device
Cambridge	I-Device
was	O
a	O
pocket-sized	O
calculator	B-Application
introduced	O
in	O
August	O
1973	O
by	O
Sinclair	O
Radionics	O
.	O
</s>
<s>
The	O
Cambridge	O
had	O
been	O
preceded	O
by	O
the	O
Sinclair	B-Device
Executive	I-Device
,	O
Sinclair	O
's	O
first	O
pocket	O
calculator	B-Application
,	O
in	O
September	O
1972	O
.	O
</s>
<s>
The	O
Cambridge	O
was	O
extremely	O
small	O
for	O
a	O
calculator	B-Application
of	O
the	O
time	O
:	O
it	O
weighed	O
less	O
than	O
and	O
its	O
size	O
was	O
.	O
</s>
<s>
Power	O
was	O
supplied	O
by	O
four	O
AAA	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
A	O
common	O
failure	O
mode	O
was	O
with	O
the	O
switch	O
contacts	O
,	O
making	O
it	O
impossible	O
to	O
switch	O
the	O
calculator	B-Application
off	O
.	O
</s>
<s>
On	O
later	O
scientific	O
variants	O
the	O
power	O
draw	O
for	O
the	O
display	O
required	O
a	O
larger	O
PP3	B-Algorithm
battery	I-Algorithm
,	O
creating	O
a	O
bulge	O
in	O
the	O
lower	O
rear	O
casing	O
of	O
the	O
appliance	O
.	O
</s>
<s>
A	O
later	O
model	O
,	O
the	O
Sinclair	B-Device
Cambridge	I-Device
Scientific	O
,	O
was	O
developed	O
,	O
and	O
launched	O
in	O
March	O
1974	O
at	O
a	O
price	O
of	O
£49.95	O
( £5	O
cheaper	O
than	O
its	O
nearest	O
rival	O
from	O
Hewlett-Packard	O
)	O
.	O
</s>
<s>
The	O
other	O
calculators	B-Application
in	O
the	O
range	O
were	O
the	O
Cambridge	O
Memory	O
,	O
Cambridge	O
Memory	O
%	O
(	O
which	O
came	O
in	O
two	O
different	O
versions	O
)	O
,	O
Cambridge	O
Programmable	O
(	O
marketed	O
in	O
the	O
United	O
States	O
as	O
the	O
Radio	O
Shack	O
EC-4001	O
)	O
,	O
Cambridge	O
Scientific	O
,	O
Cambridge	O
Scientific	O
Programmable	O
and	O
Cambridge	O
Universal	O
.	O
</s>
<s>
It	O
lacked	O
accuracy	O
in	O
many	O
of	O
its	O
scientific	O
functions	O
,	O
some	O
yielding	O
only	O
four	O
significant	B-Architecture
digits	I-Architecture
.	O
</s>
<s>
It	O
featured	O
a	O
single	O
memory	B-General_Concept
register	I-General_Concept
and	O
a	O
limit	O
of	O
36	O
program	O
steps	O
,	O
along	O
with	O
a	O
conditional	B-General_Concept
jump	I-General_Concept
instruction	O
.	O
</s>
<s>
The	O
Cambridge	O
Programmable	O
was	O
superseded	O
by	O
the	O
Sinclair	B-Device
Enterprise	I-Device
,	O
which	O
allowed	O
80	O
program	O
steps	O
.	O
</s>
