<s>
The	O
Oberon	B-Application
System	I-Application
is	O
a	O
modular	O
,	O
single-user	O
,	O
single-process	O
,	O
multitasking	O
operating	B-General_Concept
system	I-General_Concept
written	O
in	O
the	O
programming	O
language	O
Oberon	B-Language
.	O
</s>
<s>
The	O
Oberon	B-Application
System	I-Application
has	O
an	O
unconventional	O
visual	O
text	B-Application
user	I-Application
interface	I-Application
(	O
TUI	O
)	O
instead	O
of	O
a	O
conventional	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
or	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
.	O
</s>
<s>
This	O
TUI	O
was	O
very	O
innovative	O
in	O
its	O
time	O
and	O
influenced	O
the	O
design	O
of	O
the	O
Acme	B-Application
text	I-Application
editor	I-Application
for	O
the	O
Plan	B-Operating_System
9	I-Operating_System
from	I-Operating_System
Bell	I-Operating_System
Labs	I-Operating_System
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
The	O
latest	O
version	O
of	O
the	O
Oberon	B-Application
System	I-Application
,	O
Project	B-Application
Oberon	I-Application
2013	O
,	O
is	O
still	O
maintained	O
by	O
Niklaus	O
Wirth	O
and	O
several	O
collaborators	O
,	O
but	O
older	O
ETH	O
versions	O
of	O
the	O
system	O
have	O
been	O
orphaned	O
.	O
</s>
<s>
The	O
system	O
also	O
evolved	O
into	O
the	O
multi-process	O
,	O
symmetric	B-Operating_System
multiprocessing	I-Operating_System
(	O
SMP	O
)	O
capable	O
A2	B-Application
(	O
formerly	O
Active	B-Operating_System
Object	I-Operating_System
System	O
(	O
AOS	O
)	O
,	O
then	O
Bluebottle	O
)	O
,	O
with	O
a	O
zooming	B-Application
user	I-Application
interface	I-Application
(	O
ZUI	B-Application
)	O
.	O
</s>
<s>
The	O
Oberon	B-Application
operating	I-Application
system	I-Application
was	O
originally	O
developed	O
as	O
part	O
of	O
the	O
NS32032-based	O
Ceres	B-Device
workstation	O
project	O
.	O
</s>
<s>
It	O
was	O
written	O
almost	O
entirely	O
(	O
and	O
in	O
the	O
2013	O
version	O
entirely	O
is	O
valid	O
)	O
in	O
the	O
Oberon	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
The	O
basic	O
system	O
was	O
designed	O
and	O
implemented	O
by	O
Niklaus	O
Wirth	O
and	O
Jürg	O
Gutknecht	O
and	O
its	O
design	O
and	O
implementation	O
is	O
fully	O
documented	O
in	O
their	O
book	O
"	O
Project	B-Application
Oberon	I-Application
"	O
.	O
</s>
<s>
The	O
user	B-Application
Interface	I-Application
and	O
programmers	O
reference	O
is	O
found	O
in	O
Martin	O
Reiser	O
's	O
book	O
"	O
The	O
Oberon	B-Application
System	I-Application
"	O
.	O
</s>
<s>
Wirth	O
and	O
Gutknecht	O
(	O
although	O
being	O
active	O
computer	B-General_Concept
science	I-General_Concept
professors	O
)	O
refer	O
to	O
themselves	O
as	O
'	O
part-time	O
programmers	O
 '	O
in	O
the	O
book	O
Project	B-Application
Oberon	I-Application
.	O
</s>
<s>
In	O
late	O
2013	O
,	O
a	O
few	O
months	O
before	O
his	O
80th	O
birthday	O
,	O
Wirth	O
published	O
a	O
second	O
edition	O
of	O
Project	B-Application
Oberon	I-Application
.	O
</s>
<s>
It	O
details	O
implementing	O
the	O
Oberon	B-Application
System	I-Application
using	O
a	O
reduced	B-Architecture
instruction	I-Architecture
set	I-Architecture
computer	I-Architecture
(	O
RISC	B-Architecture
)	O
CPU	O
of	O
his	O
own	O
design	O
realized	O
on	O
a	O
Xilinx	O
field-programmable	B-Architecture
gate	I-Architecture
array	I-Architecture
(	O
FPGA	B-Architecture
)	O
board	O
.	O
</s>
<s>
According	O
to	O
Josef	O
Templ	O
,	O
a	O
former	O
member	O
of	O
the	O
developer	O
group	O
at	O
Swiss	O
Federal	O
Institute	O
of	O
Technology	O
in	O
Zurich	O
and	O
later	O
member	O
of	O
the	O
Institut	O
für	O
Systemsoftware	O
of	O
Johannes	O
Kepler	O
University	O
Linz	O
,	O
where	O
one	O
forked	O
version	O
(	O
V4	O
)	O
was	O
maintained	O
,	O
the	O
genealogy	O
of	O
the	O
different	O
versions	O
of	O
the	O
Oberon	B-Application
System	I-Application
is	O
this	O
:	O
</s>
<s>
Year	O
Name	O
Remark	O
1985	O
Start	O
of	O
Oberon	B-Language
project	O
1987	O
V1	O
Internal	O
use	O
at	O
ETHZ	O
;	O
Wirth	O
,	O
Niklaus	O
.	O
</s>
<s>
simple	O
text	O
editing	O
facilities	O
only	O
1991	O
V2	O
Extensible	O
text	O
model	O
and	O
a	O
special	O
editor	O
named	O
WriteSzyperski	O
,	O
Clemens	O
A.	O
,	O
Write	O
:	O
An	O
extensible	O
text	O
editor	O
for	O
the	O
Oberon	B-Application
system	I-Application
.	O
</s>
<s>
Report	O
151	O
.	O
supporting	O
these	O
extensions	O
1991	O
System	O
3	O
Kernel	B-Operating_System
extensions	O
supporting	O
persistent	O
objects	O
and	O
object-libraries	O
supporting	O
object	O
embedding	O
and	O
object	O
linking	O
;	O
Gadgets	O
,	O
Script	O
(	O
text	O
editor	O
)	O
,	O
Illustrate	O
(	O
graphics	O
editor	O
)	O
1992	O
Publication	O
of	O
Oberon	B-Language
Trilogy	O
:	O
"	O
Project	B-Application
Oberon	I-Application
"	O
,	O
"	O
The	O
Oberon	B-Application
System	I-Application
"	O
,	O
and	O
"	O
Programming	O
in	O
Oberon	B-Language
"	O
1992	O
V4	O
Functions	O
of	O
Write	O
integrated	O
into	O
standard	O
text	O
editor	O
Rel	O
.	O
</s>
<s>
Oberon	B-Language
has	O
a	O
text	B-Application
user	I-Application
interface	I-Application
(	O
TUI	O
)	O
,	O
which	O
is	O
very	O
different	O
from	O
a	O
terminal	B-Application
user	I-Application
interface	I-Application
.	O
</s>
<s>
It	O
combines	O
the	O
point	O
and	O
click	O
convenience	O
of	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
with	O
the	O
linguistic	O
strength	O
of	O
a	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
and	O
is	O
closely	O
tied	O
to	O
the	O
naming	O
conventions	O
of	O
the	O
Oberon	B-Language
language	O
.	O
</s>
<s>
Text	O
appearing	O
almost	O
anywhere	O
on	O
a	O
screen	O
can	O
be	O
edited	O
and	O
used	O
as	O
command	B-Application
input	O
.	O
</s>
<s>
Commands	O
are	O
activated	O
by	O
a	O
middle-mouse	O
click	O
on	O
a	O
text	O
fragment	O
of	O
the	O
form	O
Module.Command	O
(	O
optionally	O
followed	O
by	O
parameters	O
,	O
which	O
are	O
terminated	O
by	O
~	O
)	O
.	O
</s>
<s>
A	O
command	B-Application
is	O
defined	O
by	O
any	O
procedure	O
which	O
is	O
exported	O
and	O
has	O
an	O
empty	O
argument	O
list	O
.	O
</s>
<s>
Parameters	O
to	O
the	O
command	B-Application
must	O
be	O
defined	O
before	O
executing	O
the	O
middle	O
click	O
,	O
and	O
must	O
be	O
explicitly	O
scanned	O
and	O
retrieved	O
by	O
the	O
procedure	O
.	O
</s>
<s>
No	O
checks	O
or	O
questions	O
occur	O
during	O
command	B-Application
execution	O
.	O
</s>
<s>
This	O
is	O
sometimes	O
called	O
a	O
non-modal	O
user	B-Application
interface	I-Application
(	O
UI	O
)	O
.	O
</s>
<s>
Nothing	O
like	O
a	O
command	B-Application
prompt	O
is	O
needed	O
.	O
</s>
<s>
Although	O
very	O
different	O
from	O
a	O
command	B-Application
line	I-Application
,	O
the	O
TUI	O
is	O
very	O
efficient	O
and	O
powerful	O
.	O
</s>
<s>
Most	O
editors	O
ask	O
the	O
user	O
when	O
closing	O
a	O
modified	O
text	O
:	O
this	O
is	O
not	O
the	O
case	O
in	O
the	O
Oberon	B-Application
System	I-Application
.	O
</s>
<s>
The	O
use	O
of	O
the	O
TUI	O
and	O
programming	O
interface	O
is	O
fully	O
documented	O
in	O
Martin	O
Reiser	O
's	O
book	O
"	O
The	O
Oberon	B-Application
System	I-Application
"	O
.	O
</s>
<s>
A	O
short	O
introduction	O
to	O
the	O
user	B-Application
interface	I-Application
can	O
be	O
found	O
on	O
Niklaus	O
Wirth	O
's	O
home	O
page	O
.	O
</s>
<s>
The	O
later	O
Versions	O
of	O
System	O
Oberon	B-Language
,	O
Oberon	B-Language
V4	O
(	O
V4	O
,	O
sometimes	O
also	O
named	O
Linz-Oberon	O
)	O
and	O
Oberon	B-Application
System	I-Application
3	O
(	O
or	O
S3	O
,	O
sometimes	O
also	O
named	O
ETH-Oberon	O
or	O
Spirit	O
of	O
Oberon	B-Language
)	O
,	O
enhanced	O
the	O
basic	O
interface	O
with	O
different	O
but	O
incompatible	O
implementations	O
for	O
buttons	O
,	O
drop	O
down	O
menus	O
,	O
and	O
other	O
active	O
elements	O
.	O
</s>
<s>
V4	O
used	O
for	O
that	O
purpose	O
a	O
dedicated	O
control	O
character	O
embedded	O
in	O
normal	O
text	O
in	O
contrast	O
to	O
System	O
3	O
,	O
which	O
extended	O
the	O
kernel	B-Operating_System
by	O
introducing	O
persistent	O
objects	O
.	O
</s>
<s>
Both	O
extensions	O
include	O
a	O
large	O
set	O
of	O
user	B-Application
interface	I-Application
elements	O
.	O
</s>
<s>
Mastering	O
the	O
Oberon	B-Language
user	B-Application
interface	I-Application
,	O
both	O
the	O
purely	O
textual	O
and	O
the	O
so-called	O
Gadgets	O
System	O
(	O
under	O
S3	O
)	O
,	O
is	O
non-trivial	O
.	O
</s>
<s>
Thus	O
,	O
after	O
successfully	O
installing	O
Oberon	B-Application
System	I-Application
3	O
,	O
it	O
is	O
recommended	O
to	O
study	O
André	O
Fischers	O
.	O
</s>
<s>
The	O
whole	O
book	O
is	O
available	O
in	O
electronic	O
form	O
under	O
a	O
one	O
user	O
license	O
in	O
every	O
installed	O
version	O
of	O
System	O
3	O
(	O
Windows	O
,	O
Linux	B-Operating_System
,	O
or	O
Native	O
,	O
i.e.	O
,	O
also	O
with	O
the	O
Gadgets	O
toolkit	O
of	O
OLR	O
)	O
.	O
</s>
<s>
More	O
information	O
how	O
to	O
get	O
your	O
own	O
copy	O
of	O
the	O
Oberon	B-Language
Companion	O
may	O
be	O
found	O
in	O
the	O
Getting	O
Started	O
section	O
of	O
the	O
Oberon	B-Language
Wikibook	O
.	O
</s>
<s>
Similar	O
user	B-Application
Interfaces	I-Application
have	O
yet	O
to	O
appear	O
in	O
more	O
commonplace	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Rob	O
Pike	O
's	O
Acme	B-Application
system	O
for	O
Plan	B-Operating_System
9	I-Operating_System
from	I-Operating_System
Bell	I-Operating_System
Labs	I-Operating_System
was	O
strongly	O
inspired	O
by	O
the	O
Oberon	B-Language
TUI	O
.	O
</s>
<s>
Whether	O
the	O
worksheet	O
interface	O
of	O
the	O
Macintosh	B-Operating_System
Programmer	I-Operating_System
's	I-Operating_System
Workshop	I-Operating_System
influenced	O
Oberon	B-Language
's	O
TUI	O
or	O
vice	O
versa	O
is	O
difficult	O
to	O
decide	O
:	O
the	O
Oberon	B-Application
System	I-Application
was	O
based	O
on	O
Wirth	O
's	O
prior	O
computer	O
design	O
the	O
Lilith	B-Device
,	O
and	O
both	O
the	O
Apple	B-Device
Macintosh	I-Device
(	O
and	O
its	O
precursor	O
Lisa	B-Device
)	O
and	O
the	O
Oberon	B-Application
System	I-Application
(	O
on	O
Ceres	B-Device
and	O
its	O
precursor	O
Lilith	B-Device
)	O
have	O
the	O
same	O
roots	O
:	O
they	O
were	O
all	O
inspired	O
by	O
the	O
Alto	B-Device
developed	O
at	O
Xerox	O
PARC	O
.	O
</s>
<s>
V1	O
was	O
the	O
first	O
usable	O
version	O
some	O
time	O
before	O
the	O
Oberon	B-Language
Trilogy	O
was	O
published	O
.	O
</s>
<s>
As	O
foreshadowed	O
in	O
the	O
table	O
in	O
section	O
History	O
above	O
,	O
there	O
was	O
a	O
major	O
fork	O
in	O
the	O
early	O
1990s	O
:	O
V4	O
vs.	O
System	O
3	O
:	O
The	O
group	O
around	O
Jürg	O
Gutknecht	O
introduced	O
persistent	O
objects	O
and	O
object-libraries	O
thereby	O
extending	O
the	O
kernel	B-Operating_System
.	O
</s>
<s>
The	O
group	O
around	O
Hanspeter	O
Mössenböck	O
realized	O
similar	O
features	O
by	O
introducing	O
active	O
elements	O
mapped	O
to	O
a	O
special	O
character	O
thereby	O
extending	O
fonts	O
without	O
changing	O
the	O
kernel	B-Operating_System
.	O
</s>
<s>
System	O
3	O
was	O
sometimes	O
also	O
named	O
Spirit	O
of	O
Oberon	B-Language
and	O
later	O
renamed	O
ETH	O
Oberon	B-Language
,	O
whereas	O
V4	O
was	O
sometimes	O
also	O
named	O
Linz	O
Oberon	B-Language
.	O
</s>
<s>
As	O
of	O
2017	O
,	O
the	O
Oberon	B-Application
OS	I-Application
is	O
available	O
for	O
several	O
hardware	O
computing	B-Device
platforms	I-Device
,	O
generally	O
in	O
no	O
cost	O
versions	O
and	O
from	O
several	O
sources	O
,	O
which	O
is	O
quite	O
confusing	O
.	O
</s>
<s>
The	O
Oberon	B-Application
OS	I-Application
is	O
typically	O
extremely	O
compact	O
.	O
</s>
<s>
Even	O
with	O
an	O
Oberon	B-Language
compiler	B-Language
,	O
assorted	O
utilities	O
including	O
a	O
web	B-Application
browser	I-Application
,	O
TCP/IP	B-Protocol
networking	O
,	O
and	O
a	O
GUI	B-Application
,	O
the	O
full	O
package	O
can	O
be	O
compressed	O
to	O
one	O
3.5	B-Device
"	I-Device
floppy	I-Device
disk	I-Device
.	O
</s>
<s>
There	O
are	O
versions	O
which	O
emulated	O
the	O
Oberon	B-Application
OS	I-Application
on	O
another	O
operating	B-General_Concept
system	I-General_Concept
and	O
versions	O
which	O
run	O
on	O
bare	O
hardware	O
.	O
</s>
<s>
The	O
latter	O
ones	O
are	O
named	O
Native	O
Oberon	B-Language
.	O
</s>
<s>
There	O
are	O
native	O
versions	O
for	O
the	O
Ceres	B-Device
,	O
Intel	B-Device
IA-32	I-Device
,	O
and	O
ARM	B-Architecture
platforms	B-Device
.	O
</s>
<s>
In	O
2013	O
,	O
Niklaus	O
Wirth	O
adapted	O
the	O
basic	O
system	O
as	O
described	O
in	O
"	O
Project	B-Application
Oberon	I-Application
"	O
to	O
a	O
current	O
FPGA	B-Architecture
design	O
.	O
</s>
<s>
According	O
to	O
the	O
preface	O
of	O
the	O
2013	O
edition	O
,	O
the	O
whole	O
system	O
compiles	B-Language
in	O
less	O
than	O
10	O
seconds	O
on	O
a	O
Spartan-3	O
board	O
.	O
</s>
<s>
This	O
version	O
is	O
sometimes	O
also	O
named	O
V5	O
,	O
despite	O
it	O
being	O
much	O
more	O
similar	O
functionally	O
to	O
the	O
original	O
V1	O
running	O
on	O
the	O
Ceres	B-Device
than	O
any	O
of	O
the	O
later	O
versions	O
.	O
</s>
<s>
A	O
version	O
of	O
the	O
Oberon	B-Application
System	I-Application
3	O
,	O
which	O
is	O
more	O
integrated	O
in	O
the	O
Microsoft	O
Windows	O
OS	O
than	O
other	O
implementations	O
was	O
named	O
Plugin	O
Oberon	B-Language
.	O
</s>
<s>
Plugin	O
Oberon	B-Language
had	O
support	O
for	O
OLE	B-Operating_System
,	O
Netscape	B-Protocol
Plugins	I-Protocol
,	O
and	O
the	O
binary	O
format	O
named	O
Oberon	B-Language
Module	O
Interchange	O
(	O
OMI	O
)	O
or	O
slim	O
binaries	O
,	O
which	O
allowed	O
portable	O
object	O
code	O
between	O
Intel	B-Operating_System
x86	I-Operating_System
,	O
Motorola	B-Device
68K	I-Device
,	O
and	O
PowerPC	B-Architecture
architectures	O
.	O
</s>
<s>
They	O
were	O
motivated	O
and	O
opposed	O
to	O
the	O
fat	O
binaries	O
invented	O
by	O
Apple	O
during	O
the	O
transition	O
from	O
68k	B-Device
to	O
PowerPC	B-Architecture
architectures	O
.	O
</s>
<s>
The	O
approach	O
of	O
a	O
compressed	O
abstract	O
syntax	O
tree	O
for	O
portable	O
code	O
representation	O
is	O
revived	O
in	O
the	O
Java	B-Language
world	O
for	O
GraalVM	B-Language
and	O
Truffle	O
.	O
</s>
<s>
The	O
version	O
named	O
Oberon	B-Language
V4	O
(	O
see	O
also	O
History	O
)	O
is	O
closer	O
to	O
the	O
original	O
operating	B-General_Concept
system	I-General_Concept
developed	O
by	O
Wirth	O
and	O
Gutknecht	O
.	O
</s>
<s>
Thus	O
,	O
V4	O
is	O
sometimes	O
also	O
called	O
Linz-Oberon	O
in	O
contrast	O
to	O
ETH-Oberon	O
.	O
</s>
<s>
Oberon	B-Language
V4	O
appears	O
to	O
be	O
orphaned	O
,	O
there	O
are	O
almost	O
no	O
changes	O
since	O
2000	O
.	O
</s>
<s>
V4	O
is	O
closer	O
to	O
what	O
would	O
now	O
be	O
called	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
than	O
an	O
operating	B-General_Concept
system	I-General_Concept
of	O
its	O
own	O
.	O
</s>
<s>
There	O
were	O
many	O
extensions	O
written	O
for	O
V4	O
,	O
which	O
are	O
still	O
available	O
from	O
the	O
;	O
some	O
documentation	O
can	O
be	O
found	O
on	O
their	O
,	O
more	O
information	O
is	O
normally	O
included	O
in	O
the	O
packages	O
and	O
it	O
is	O
given	O
in	O
Oberon	B-Language
's	O
special	O
rich	O
text	O
format	O
.	O
</s>
<s>
Around	O
2010	O
,	O
the	O
computer	B-General_Concept
science	I-General_Concept
department	O
at	O
ETH	O
Zurich	O
began	O
exploring	O
active	B-Operating_System
objects	I-Operating_System
and	O
concurrency	B-Operating_System
for	O
operating	B-General_Concept
systems	I-General_Concept
,	O
and	O
has	O
released	O
an	O
early	O
version	O
of	O
a	O
new	O
language	O
Active	B-Language
Oberon	I-Language
and	O
a	O
new	O
operating	B-General_Concept
system	I-General_Concept
for	O
it	O
,	O
first	O
named	O
Active	B-Operating_System
Object	I-Operating_System
System	O
(	O
AOS	O
)	O
in	O
2002	O
,	O
then	O
due	O
to	O
trademark	O
issues	O
,	O
renamed	O
Bluebottle	O
in	O
2005	O
,	O
then	O
renamed	O
A2	B-Application
in	O
2008	O
.	O
</s>
<s>
Native	O
versions	O
(	O
A2	B-Application
)	O
run	O
on	O
bare	O
hardware	O
,	O
and	O
are	O
currently	O
possible	O
for	O
Intel	B-Device
IA-32	I-Device
and	O
x86-64	B-Device
single	O
-	O
and	O
multi-processor	O
systems	O
,	O
and	O
for	O
the	O
StrongARM	B-Device
CPU	O
family	O
.	O
</s>
<s>
Versions	O
for	O
other	O
operating	B-General_Concept
systems	I-General_Concept
are	O
available	O
on	O
Windows	O
(	O
WinAos	O
)	O
,	O
Unix	B-Application
(	O
UnixAos	O
)	O
,	O
Linux	B-Operating_System
(	O
LinuxAos	O
)	O
,	O
and	O
macOS	B-Application
(	O
DarwinAos	O
)	O
.	O
</s>
<s>
More	O
detailed	O
information	O
about	O
A2	B-Application
is	O
on	O
the	O
Russian	O
Wikipedia	O
pages	O
about	O
A2	B-Application
.	O
</s>
<s>
As	O
a	O
part	O
of	O
an	O
industrial	O
research	O
project	O
the	O
Native	O
Systems	O
Group	O
of	O
ETH	O
Zurich	O
has	O
developed	O
an	O
application-specific	O
operating	B-General_Concept
system	I-General_Concept
named	O
stailaOS	O
which	O
is	O
based	O
on	O
the	O
latest	O
version	O
Oberon	B-Application
OS	I-Application
.	O
</s>
<s>
It	O
is	O
intended	O
for	O
uses	O
such	O
as	O
real-time	B-General_Concept
analytics	O
,	O
high	O
performance	O
automated	B-Algorithm
trading	I-Algorithm
system	I-Algorithm
(	O
ATS	O
)	O
,	O
main	O
memory	O
based	O
enterprise	O
resource	O
planning	O
(	O
ERP	O
)	O
,	O
etc	O
.	O
</s>
<s>
Native	O
Oberon	B-Language
is	O
an	O
Oberon	B-Application
System	I-Application
that	O
runs	O
on	O
bare	O
hardware	O
.	O
</s>
<s>
PC-Native	O
Oberon	B-Language
is	O
a	O
version	O
that	O
runs	O
on	O
IA-32	B-Device
(	O
x86-32	B-Device
)	O
PC	O
hardware	O
.	O
</s>
<s>
There	O
has	O
never	O
been	O
a	O
V4	O
Native	O
Oberon	B-Language
,	O
so	O
all	O
information	O
in	O
this	O
section	O
implicitly	O
assumes	O
that	O
it	O
is	O
System	O
3	O
.	O
</s>
<s>
Native	O
Oberon	B-Language
has	O
small	O
hardware	O
requirements	O
:	O
133MHz	O
Pentium	O
,	O
100MB	O
hard	O
disk	O
,	O
VESA	O
2	O
graphics	O
card	O
with	O
resolution	O
minimum	O
of	O
1024x768	O
pixels	O
,	O
optional	O
3Com	O
network	O
card	O
.	O
</s>
<s>
The	O
basic	O
system	O
runs	O
from	O
one	O
HD	O
floppy	B-Device
disk	I-Device
,	O
and	O
more	O
software	O
can	O
be	O
installed	O
through	O
a	O
network	O
.	O
</s>
<s>
The	O
full	O
installation	O
includes	O
the	O
Gadgets	O
GUI	B-Application
.	O
</s>
<s>
It	O
is	O
written	O
fully	O
in	O
the	O
language	O
Oberon	B-Language
.	O
</s>
<s>
Later	O
versions	O
were	O
incorporated	O
in	O
AOS/BlueBottle/A2	B-Application
.	O
</s>
<s>
A	O
version	O
named	O
Linux	B-Operating_System
Native	O
Oberon	B-Language
(	O
LNO	O
)	O
uses	O
Linux	B-Operating_System
as	O
a	O
hardware	B-Operating_System
abstraction	I-Operating_System
layer	I-Operating_System
(	O
HAL	B-Operating_System
)	O
.	O
</s>
<s>
Its	O
goal	O
is	O
to	O
be	O
as	O
compatible	O
as	O
possible	O
to	O
PC-Native	O
Oberon	B-Language
.	O
</s>
<s>
Other	O
versions	O
of	O
the	O
Oberon	B-Application
System	I-Application
,	O
without	O
Native	O
in	O
the	O
name	O
,	O
had	O
partly	O
modified	O
interfaces	O
of	O
low	O
level	O
modules	O
.	O
</s>
<s>
In	O
2015	O
,	O
Peter	O
Matthias	O
revitalized	O
LNO	O
under	O
the	O
name	O
Oberon	B-Language
Linux	B-Operating_System
Revival	O
(	O
OLR	O
)	O
as	O
a	O
multi-platform	O
distribution	O
running	O
seamlessly	O
on	O
Intel	B-Operating_System
x86	I-Operating_System
,	O
ARM	B-Architecture
,	O
MIPS	B-General_Concept
,	O
and	O
RISC-V	B-Device
.	O
</s>
<s>
It	O
runs	O
well	O
on	O
the	O
Raspberry	B-Operating_System
Pi	I-Operating_System
and	O
on	O
the	O
low	O
cost	O
CHIP	B-Application
computer	O
;	O
with	O
some	O
tweaking	O
(	O
adjusting	O
group	O
membership	O
or/and	O
permissions	O
on	O
some	O
devices	O
)	O
it	O
runs	O
well	O
on	O
Tiny	O
Core	O
Linux	B-Operating_System
.	O
</s>
<s>
OLR	O
interfaces	O
with	O
Linux	B-Operating_System
kernel	I-Operating_System
by	O
direct	O
system	B-Operating_System
calls	I-Operating_System
.	O
</s>
<s>
In	O
2013	O
,	O
Wirth	O
and	O
Paul	O
Reed	O
completed	O
a	O
re-implementation	O
of	O
the	O
original	O
Oberon	B-Application
System	I-Application
for	O
the	O
Digilent	O
Xilinx	O
Spartan	O
3	O
FPGA	B-Architecture
Starter	O
Board	O
.	O
</s>
<s>
The	O
work	O
includes	O
a	O
revision	O
of	O
"	O
Project	B-Application
Oberon	I-Application
"	O
,	O
identified	O
as	O
.	O
</s>
<s>
In	O
2015	O
,	O
Reed	O
collaborated	O
with	O
Victor	O
Yurkovsky	O
to	O
create	O
,	O
a	O
Xilinx	O
Spartan	O
3-based	O
computer	O
designed	O
specifically	O
to	O
run	O
Oberon	B-Language
.	O
</s>
<s>
The	O
system	O
has	O
since	O
been	O
ported	O
to	O
a	O
Xilinx	O
Spartan	O
6	O
FPGA	B-Architecture
Pepino	O
development	O
board	O
by	O
,	O
and	O
a	O
Xilinx	O
Artix	O
7-based	O
by	O
.	O
</s>
<s>
Andreas	O
Pirklbauer	O
maintains	O
an	O
and	O
extensions	O
of	O
Project	B-Application
Oberon	I-Application
2013	O
at	O
GitHub	B-Application
.	O
</s>
<s>
A2	B-Application
–	O
Formerly	O
Active	B-Operating_System
Object	I-Operating_System
System	O
(	O
AOS	O
)	O
in	O
2002	O
,	O
renamed	O
Bluebottle	O
in	O
2005	O
due	O
to	O
rumored	O
copyright	O
issues	O
,	O
renamed	O
A2	B-Application
in	O
2008	O
.	O
</s>
<s>
ALO	O
–	O
ARM	B-Architecture
Linux	B-Operating_System
Oberon	B-Language
;	O
in	O
LNO	O
family	O
and	O
for	O
ARM	B-Architecture
CPU	O
.	O
</s>
<s>
AOS	O
–	O
see	O
A2	B-Application
entry	O
above	O
.	O
</s>
<s>
BB	O
–	O
BlackBox	B-Application
Component	I-Application
Builder	I-Application
.	O
</s>
<s>
Component	B-Language
Pascal	I-Language
IDE	O
from	O
.	O
</s>
<s>
Bluebottle	O
–	O
see	O
A2	B-Application
entry	O
above	O
.	O
</s>
<s>
CP	O
–	O
Component	B-Language
Pascal	I-Language
.	O
</s>
<s>
A	O
dialect	O
in	O
the	O
Oberon	B-Language
family	O
most	O
similar	O
to	O
Oberon-2	B-Language
.	O
</s>
<s>
ETHO	O
–	O
Oberon	B-Language
as	O
developed	O
at	O
Swiss	O
Federal	O
Institute	O
of	O
Technology	O
in	O
Zurich	O
:	O
Eidgenössische	O
Technische	O
Hochschule	O
(	O
ETH	O
)	O
.	O
</s>
<s>
Fox	O
–	O
The	O
compiler	B-Language
for	O
Active	B-Language
Oberon	I-Language
,	O
appearing	O
in	O
AOS	O
(	O
see	O
A2	B-Application
entry	O
above	O
)	O
.	O
</s>
<s>
LEO	O
–	O
Linux	B-Operating_System
ETH	O
Oberon	B-Language
.	O
</s>
<s>
ETHO	O
2.4.3	O
for	O
Linux	B-Operating_System
x86	B-Operating_System
.	O
</s>
<s>
LNO	O
–	O
Linux	B-Operating_System
Native	O
Oberon	B-Language
.	O
</s>
<s>
NO	O
–	O
Native	O
Oberon	B-Language
.	O
</s>
<s>
Runs	O
on	O
bare	O
hardware	O
rather	O
than	O
on	O
another	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
OLR	O
–	O
Oberon	B-Language
Linux	B-Operating_System
Revival	O
.	O
</s>
<s>
A	O
version	O
of	O
NO	O
which	O
uses	O
Linux	B-Operating_System
as	O
a	O
HAL	B-Operating_System
and	O
runs	O
on	O
x86	B-Operating_System
,	O
ARM	B-Architecture
,	O
and	O
MIPS	B-General_Concept
.	O
</s>
<s>
OP2	O
–	O
The	O
Portable	O
Oberon-2	B-Language
Compiler	B-Language
.	O
</s>
<s>
OP2	O
was	O
developed	O
to	O
port	O
Oberon	B-Language
onto	O
commercially	O
available	O
platforms	B-Device
.	O
</s>
<s>
PACO	O
–	O
(	O
scope	O
)	O
PArallel	B-Language
COmpiler	I-Language
.	O
</s>
<s>
Appears	O
in	O
A2	B-Application
(	O
see	O
entry	O
above	O
)	O
.	O
</s>
<s>
Compiles	B-Language
each	O
scope	O
in	O
an	O
independent	O
thread	O
.	O
</s>
<s>
RISC5	O
–	O
the	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
of	O
Project	B-Application
Oberon	I-Application
2013	O
based	O
on	O
Wirth	O
's	O
RISC	B-Architecture
architecture	O
.	O
</s>
<s>
Not	O
to	O
be	O
confused	O
with	O
RISC-V	B-Device
.	O
</s>
<s>
UnixAOS	O
–	O
Unix-based	O
AOS	O
,	O
see	O
A2	B-Application
entry	O
above	O
.	O
</s>
<s>
WinAOS	O
–	O
Windows-based	O
AOS	O
,	O
see	O
A2	B-Application
entry	O
above	O
.	O
</s>
