<s>
EKA1	B-Language
(	O
EPOC	B-Language
Kernel	B-Operating_System
Architecture	O
1	O
)	O
is	O
the	O
first-generation	O
kernel	B-Operating_System
for	O
the	O
operating	B-General_Concept
system	I-General_Concept
Symbian	B-Operating_System
OS	I-Operating_System
.	O
</s>
<s>
EKA1	B-Language
originated	O
in	O
the	O
earlier	O
operating	B-General_Concept
system	I-General_Concept
EPOC	B-Language
.	O
</s>
<s>
It	O
offers	O
preemptive	B-Operating_System
computer	B-Operating_System
multitasking	I-Operating_System
and	O
memory	O
protection	O
,	O
but	O
no	O
real-time	B-General_Concept
computing	I-General_Concept
guarantees	O
,	O
and	O
a	O
single-threaded	B-Operating_System
device	B-Application
driver	I-Application
model	O
.	O
</s>
<s>
It	O
was	O
largely	O
been	O
superseded	O
by	O
EKA2	B-Language
.	O
</s>
<s>
Much	O
of	O
EKA1	B-Language
was	O
developed	O
by	O
a	O
single	O
software	O
engineer	O
,	O
Colly	O
Myers	O
,	O
when	O
he	O
was	O
working	O
for	O
Psion	B-Application
Software	I-Application
in	O
the	O
early	O
1990s	O
.	O
</s>
<s>
Myers	O
went	O
on	O
to	O
act	O
as	O
CEO	O
for	O
Symbian	B-Operating_System
Ltd.	O
,	O
when	O
it	O
was	O
formed	O
to	O
license	O
this	O
kernel	B-Operating_System
and	O
associated	O
operating	B-General_Concept
system	I-General_Concept
to	O
mobile	O
phone	O
makers	O
.	O
</s>
