<s>
The	O
Ceres	B-Device
Workstation	B-Device
was	O
a	O
workstation	B-Device
computer	I-Device
built	O
by	O
Niklaus	O
Wirth	O
's	O
group	O
at	O
ETH	O
Zurich	O
in	O
1987.The	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
is	O
a	O
National	B-Device
Semiconductor	I-Device
NS32000	I-Device
,	O
and	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
named	O
Oberon	B-Application
System	I-Application
is	O
written	O
fully	O
in	O
the	O
object-oriented	B-Language
programming	I-Language
language	I-Language
Oberon	B-Language
.	O
</s>
<s>
It	O
is	O
an	O
early	O
example	O
of	O
an	O
operating	B-Application
system	I-Application
using	I-Application
basic	I-Application
object-oriented	I-Application
principles	I-Application
and	O
garbage	B-General_Concept
collection	I-General_Concept
on	O
the	O
system	O
level	O
and	O
a	O
document	O
centered	O
approach	O
for	O
the	O
user	B-Application
interface	I-Application
(	O
UI	O
)	O
,	O
as	O
envisaged	O
later	O
with	O
OpenDoc	B-Application
.	O
</s>
<s>
Ceres	B-Device
was	O
a	O
follow-up	O
project	O
to	O
the	O
Lilith	B-Device
workstation	B-Device
,	O
based	O
on	O
AMD	O
bit	B-General_Concept
slicing	I-General_Concept
technology	O
and	O
the	O
programming	O
language	O
Modula-2	B-Language
.	O
</s>
<s>
On	O
the	O
same	O
hardware	O
,	O
Clemens	O
Szyperski	O
implemented	O
as	O
part	O
of	O
his	O
Doctor	O
of	O
Philosophy	O
(	O
PhD	O
)	O
thesis	O
an	O
operating	B-General_Concept
system	I-General_Concept
named	O
ETHOS	O
,	O
which	O
takes	O
full	O
advantage	O
of	O
object-oriented	B-Language
technologies	I-Language
.	O
</s>
<s>
A	O
Usenet	O
posting	O
by	O
Szyperski	O
says	O
that	O
Oberon/F	O
,	O
which	O
was	O
later	O
renamed	O
to	O
BlackBox	B-Application
Component	I-Application
Builder	I-Application
,	O
incorporates	O
ETHOS	O
ideas	O
and	O
principles	O
.	O
</s>
