<s>
68K/OS	B-Operating_System
was	O
a	O
computer	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
developed	O
by	O
GST	O
Computer	O
Systems	O
for	O
the	O
Sinclair	B-Device
QL	I-Device
microcomputer	B-Architecture
.	O
</s>
<s>
However	O
,	O
after	O
the	O
official	O
launch	O
of	O
the	O
QL	O
in	O
January	O
1984	O
,	O
68K/OS	B-Operating_System
was	O
rejected	O
,	O
and	O
production	O
QLs	O
shipped	O
with	O
Sinclair	O
's	O
own	O
Qdos	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
GST	O
later	O
released	O
68K/OS	B-Operating_System
as	O
an	O
alternative	O
to	O
Qdos	B-Operating_System
,	O
in	O
the	O
form	O
of	O
an	O
EPROM	B-General_Concept
expansion	B-Device
card	I-Device
,	O
and	O
also	O
planned	O
to	O
use	O
it	O
on	O
single-board	B-Device
computers	I-Device
based	O
on	O
the	O
QL	O
's	O
hardware	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
was	O
developed	O
by	O
Chris	O
Scheybeler	O
,	O
Tim	O
Ward	O
,	O
Howard	O
Chalkley	O
and	O
others	O
.	O
</s>
<s>
The	O
few	O
ROM	O
cards	O
that	O
were	O
made	O
mean	O
that	O
surviving	O
examples	O
now	O
fetch	O
a	O
high	O
price	O
:	O
On	O
Feb	O
04	O
,	O
2010	O
one	O
sold	O
for	O
£310	O
on	O
eBay	B-Application
.	I-Application
</s>
