<s>
AmigaOS	B-Application
is	O
the	O
proprietary	O
native	O
operating	B-General_Concept
system	I-General_Concept
of	O
the	O
Amiga	B-Device
personal	O
computer	O
.	O
</s>
<s>
Since	O
its	O
introduction	O
with	O
the	O
launch	O
of	O
the	O
Amiga	B-Device
1000	I-Device
in	O
1985	O
,	O
there	O
have	O
been	O
four	O
major	O
versions	O
and	O
several	O
minor	O
revisions	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Initially	O
the	O
Amiga	B-Application
operating	I-Application
system	I-Application
had	O
no	O
strong	O
name	O
and	O
branding	O
,	O
as	O
it	O
was	O
simply	O
considered	O
an	O
integral	O
part	O
of	O
the	O
Amiga	B-Device
system	O
as	O
a	O
whole	O
.	O
</s>
<s>
Early	O
names	O
used	O
for	O
the	O
Amiga	B-Application
operating	I-Application
system	I-Application
included	O
"	O
CAOS	O
"	O
and	O
"	O
AmigaDOS	O
"	O
.	O
</s>
<s>
Another	O
non-official	O
name	O
was	O
"	O
Workbench	O
"	O
,	O
from	O
the	O
name	O
of	O
the	O
Amiga	B-Device
desktop	O
environment	O
,	O
which	O
was	O
included	O
on	O
a	O
floppy	O
disk	O
named	O
"	O
Amiga	B-Device
Workbench	O
"	O
.	O
</s>
<s>
Version	O
3.1	O
of	O
the	O
Amiga	B-Application
operating	I-Application
system	I-Application
was	O
the	O
first	O
version	O
to	O
be	O
officially	O
referred	O
to	O
as	O
"	O
Amiga	B-Application
OS	I-Application
"	O
(	O
with	O
a	O
space	O
between	O
"	O
Amiga	B-Device
"	O
and	O
"	O
OS	O
"	O
)	O
by	O
Commodore	O
.	O
</s>
<s>
Version	O
4.0	O
of	O
the	O
Amiga	B-Application
operating	I-Application
system	I-Application
was	O
the	O
first	O
version	O
to	O
be	O
branded	O
as	O
a	O
less	O
generic	O
"	O
AmigaOS	B-Application
"	O
(	O
without	O
the	O
space	O
)	O
.	O
</s>
<s>
What	O
many	O
consider	O
the	O
first	O
versions	O
of	O
AmigaOS	B-Application
(	O
Workbench	O
1.0	O
up	O
to	O
3.0	O
)	O
are	O
here	O
indicated	O
with	O
the	O
Workbench	O
name	O
of	O
their	O
original	O
disks	O
.	O
</s>
<s>
Version	O
1.1	O
consists	O
mostly	O
of	O
bug	O
fixes	O
and	O
,	O
like	O
version	O
1.0	O
,	O
was	O
distributed	O
only	O
for	O
the	O
Amiga	B-Device
1000	I-Device
.	O
</s>
<s>
The	O
entire	O
Workbench	O
operating	B-General_Concept
system	I-General_Concept
consisted	O
of	O
three	O
floppy	O
disks	O
:	O
Kickstart	O
,	O
Workbench	O
and	O
ABasic	O
by	O
MetaComCo	B-Device
.	O
</s>
<s>
The	O
Amiga	B-Device
1000	I-Device
needed	O
a	O
Kickstart	O
disk	O
to	O
be	O
inserted	O
into	O
floppy	O
drive	O
to	O
boot	O
up	O
.	O
</s>
<s>
Workbench	O
version	O
1.2	O
was	O
the	O
first	O
to	O
support	O
Kickstart	O
stored	O
in	O
a	O
ROM	B-Device
.	O
</s>
<s>
A	O
Kickstart	O
disk	O
was	O
still	O
necessary	O
for	O
Amiga	B-Device
1000	I-Device
models	O
;	O
it	O
was	O
no	O
longer	O
necessary	O
for	O
Amiga	B-Device
500	O
or	O
2000	O
,	O
but	O
the	O
users	O
of	O
these	O
systems	O
had	O
to	O
change	O
the	O
ROMs	O
(	O
which	O
were	O
socketed	O
)	O
to	O
change	O
the	O
Kickstart	O
version	O
.	O
</s>
<s>
Workbench	O
now	O
spanned	O
two	O
floppy	O
disks	O
,	O
and	O
supported	O
installing	O
and	O
booting	O
from	O
hard	O
drive	O
(	O
assuming	O
the	O
Amiga	B-Device
was	O
equipped	O
with	O
one	O
)	O
,	O
the	O
name	O
of	O
the	O
main	O
disk	O
was	O
still	O
named	O
"	O
Workbench	O
"	O
(	O
which	O
is	O
also	O
the	O
user	O
interface	O
portion	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
)	O
.	O
</s>
<s>
The	O
system	O
now	O
shipped	O
with	O
AmigaBasic	B-Language
by	O
Microsoft	O
,	O
the	O
only	O
software	O
Microsoft	O
ever	O
wrote	O
for	O
the	O
Amiga	B-Device
.	O
</s>
<s>
Kickstart	O
version	O
1.2	O
corrected	O
various	O
flaws	O
and	O
added	O
AutoConfig	B-Device
support	O
.	O
</s>
<s>
AutoConfig	B-Device
is	O
a	O
protocol	O
similar	O
to	O
and	O
is	O
the	O
predecessor	O
of	O
Plug	B-Device
and	I-Device
Play	I-Device
,	O
in	O
that	O
it	O
can	O
configure	O
expansion	O
boards	O
without	O
user	O
intervention	O
.	O
</s>
<s>
Workbench	O
1.3	O
,	O
on	O
the	O
other	O
hand	O
,	O
users	O
can	O
find	O
several	O
significant	O
improvements	O
to	O
Workbench	O
,	O
including	O
FFS	B-Device
a	O
faster	O
file	O
system	O
for	O
hard	O
disks	O
storage	O
which	O
resolved	O
the	O
problem	O
of	O
old	B-Application
Amiga	I-Application
filesystem	I-Application
which	O
wasted	O
too	O
much	O
hard	O
disk	O
space	O
due	O
to	O
the	O
fact	O
it	O
could	O
store	O
only	O
488	O
bytes	O
in	O
any	O
block	O
of	O
512	O
bytes	O
keeping	O
24	O
bytes	O
for	O
checksums	O
.	O
</s>
<s>
Many	O
improvements	O
were	O
made	O
to	O
the	O
CLI	O
(	O
command	O
line	O
interface	O
)	O
of	O
Amiga	B-Device
which	O
was	O
now	O
a	O
complete	O
text	O
based	O
Shell	O
,	O
named	O
AmigaShell	O
,	O
and	O
various	O
additional	O
tools	O
and	O
programs	O
.	O
</s>
<s>
Kickstart/Workbench	O
1.4	O
was	O
a	O
beta	O
version	O
of	O
the	O
upcoming	O
2.0	O
update	O
and	O
never	O
released	O
,	O
but	O
the	O
Kickstart	O
part	O
was	O
shipped	O
in	O
very	O
small	O
quantities	O
with	O
early	O
Amiga	B-Device
3000	I-Device
computers	O
,	O
where	O
it	O
is	O
often	O
referred	O
to	O
as	O
the	O
"	O
Superkickstart	O
ROM	B-Device
"	O
.	O
</s>
<s>
Workbench	O
2.0	O
was	O
released	O
in	O
1990	O
and	O
introduced	O
a	O
lot	O
of	O
improvements	O
and	O
major	O
advances	O
to	O
the	O
GUI	O
of	O
the	O
overall	O
Amiga	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
This	O
was	O
done	O
by	O
creating	O
the	O
Amiga	B-Device
Style	O
Guide	O
,	O
and	O
including	O
libraries	O
and	O
software	O
which	O
assisted	O
developers	O
in	O
making	O
conformant	O
software	O
.	O
</s>
<s>
Technologies	O
included	O
the	O
GUI	O
element	O
creation	O
library	O
gadtools	O
,	O
the	O
software	O
installation	O
scripting	O
language	O
Installer	O
,	O
and	O
the	O
AmigaGuide	B-Operating_System
hypertext	O
help	O
system	O
.	O
</s>
<s>
The	O
AmigaDOS	O
,	O
previously	O
written	O
in	O
BCPL	B-Language
and	O
very	O
difficult	O
to	O
develop	O
for	O
beyond	O
basic	O
file	O
manipulation	O
,	O
was	O
mostly	O
rewritten	O
in	O
C	B-Language
.	O
</s>
<s>
Most	O
often	O
,	O
the	O
failure	O
occurred	O
because	O
programmers	O
had	O
used	O
directly	O
manipulated	O
private	O
structures	O
maintained	O
by	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
rather	O
than	O
using	O
official	O
function	O
calls	O
.	O
</s>
<s>
2.x	O
shipped	O
with	O
the	O
A500+	O
(	O
2.04	O
)	O
,	O
A600	O
(	O
2.05	O
)	O
,	O
A3000	B-Device
and	O
A3000T	O
.	O
</s>
<s>
It	O
included	O
useful	O
features	O
such	O
as	O
CrossDOS	B-Application
,	O
to	O
support	O
working	O
with	O
floppy	O
disks	O
formatted	O
for	O
PCs	O
.	O
</s>
<s>
Since	O
2.1	O
was	O
a	O
software-only	O
release	O
,	O
there	O
was	O
no	O
Kickstart	O
2.1	O
ROM	B-Device
.	O
</s>
<s>
It	O
was	O
called	O
AmigaGuide	B-Operating_System
.	O
</s>
<s>
Release	O
2.1	O
was	O
also	O
the	O
first	O
Workbench	O
release	O
to	O
feature	O
a	O
system-standard	O
localization	O
system	O
,	O
allowing	O
the	O
user	O
to	O
make	O
an	O
ordered	O
list	O
of	O
preferred	O
languages	O
;	O
when	O
a	O
locale-aware	O
application	O
runs	O
,	O
it	O
asks	O
the	O
operating	B-General_Concept
system	I-General_Concept
to	O
find	O
the	O
catalog	O
(	O
a	O
file	O
containing	O
translations	O
of	O
the	O
application	O
's	O
strings	O
)	O
best	O
matching	O
the	O
user	O
's	O
preferences	O
.	O
</s>
<s>
Amiga	B-Application
OS	I-Application
3.0	O
was	O
released	O
in	O
1992	O
and	O
version	O
3.1	O
between	O
1993	O
(	O
for	O
the	O
CD32	B-Device
)	O
and	O
1994	O
(	O
for	O
other	O
Amiga	B-Device
models	O
)	O
.	O
</s>
<s>
Amiga	B-Application
OS	I-Application
3.1	O
was	O
the	O
last	O
version	O
released	O
by	O
Commodore	O
.	O
</s>
<s>
The	O
3.x	O
series	O
added	O
support	O
for	O
new	O
Amiga	B-Device
models	O
.	O
</s>
<s>
CD-ROM	O
support	O
as	O
required	O
for	O
Amiga	B-Device
CD32	I-Device
.	O
</s>
<s>
3.x	O
shipped	O
with	O
the	O
CD32	B-Device
,	O
A1200	B-Application
,	O
A4000	B-Device
and	O
A4000T	B-Device
.	O
</s>
<s>
AmigaOS	B-Application
3.1.4	O
was	O
released	O
in	O
September	O
2018	O
by	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
with	O
many	O
fixes	O
and	O
enhancements	O
.	O
</s>
<s>
In	O
particular	O
,	O
support	O
of	O
larger	O
hard	O
drives	O
including	O
at	O
bootup	O
;	O
the	O
entire	O
line	O
of	O
Motorola	B-Device
680x0	I-Device
CPUs	O
up	O
to	O
(	O
and	O
including	O
)	O
the	O
Motorola	O
68060	O
;	O
and	O
a	O
modernized	O
Workbench	O
with	O
a	O
new	O
,	O
optional	O
icon	O
set	O
.	O
</s>
<s>
The	O
version	O
number	O
caused	O
some	O
confusion	O
in	O
the	O
community	O
as	O
it	O
was	O
released	O
after	O
AmigaOS	B-Application
3.5	O
,	O
3.9	O
,	O
and	O
even	O
4.x	O
,	O
but	O
relates	O
to	O
the	O
fact	O
that	O
the	O
codebase	O
is	O
a	O
clean	O
slate	O
building	O
from	O
the	O
original	O
3.1	O
source	O
code	O
from	O
Commodore	O
.	O
</s>
<s>
The	O
source	O
code	O
for	O
both	O
3.5	O
and	O
3.9	O
by	O
Haage	O
&	O
Partner	O
could	O
not	O
legally	O
be	O
used	O
due	O
to	O
licensing	O
reasons	O
,	O
and	O
4.x	O
is	O
built	O
and	O
reserved	O
for	O
the	O
PowerPC	B-Architecture
platform	I-Architecture
.	O
</s>
<s>
Unlike	O
AmigaOS	B-Application
3.5	O
,	O
AmigaOS	B-Application
3.1.4	O
still	O
supports	O
the	O
Motorola	B-Device
68000	I-Device
CPU	O
,	O
thus	O
the	O
complete	O
range	O
of	O
classic	O
Amiga	B-Device
computers	I-Device
.	O
</s>
<s>
In	O
May	O
2021	O
,	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
released	O
AmigaOS	B-Application
3.2	O
,	O
which	O
includes	O
all	O
features	O
of	O
the	O
previous	O
version	O
(	O
3.1.4.1	O
)	O
and	O
adds	O
several	O
new	O
improvements	O
such	O
as	O
support	O
for	O
ReAction	B-Library
GUI	I-Library
,	O
management	O
of	O
Amiga	B-Device
Disk	O
File	O
images	O
,	O
help	O
system	O
and	O
improved	O
datatypes	O
.	O
</s>
<s>
After	O
the	O
demise	O
of	O
Commodore	O
,	O
Workbench	O
3.5	O
was	O
released	O
on	O
18	O
October	O
1999	O
and	O
Workbench	O
3.9	O
in	O
December	O
2000	O
by	O
German	O
company	O
Haage	O
&	O
Partner	O
,	O
which	O
was	O
granted	O
the	O
license	O
to	O
update	O
the	O
Amiga	B-Application
operating	I-Application
system	I-Application
by	O
its	O
new	O
owners	O
.	O
</s>
<s>
Whereas	O
all	O
previous	O
OS	O
releases	O
ran	O
on	O
Motorola	B-Device
68000	I-Device
,	O
AmigaOS	B-Application
3.5	O
onwards	O
required	O
a	O
68020	B-Device
or	O
better	O
,	O
CD-ROM	O
and	O
at	O
least	O
4	O
MB	O
RAM	O
.	O
</s>
<s>
Unlike	O
previous	O
releases	O
,	O
3.5	O
and	O
3.9	O
were	O
released	O
on	O
CD-ROM	O
.	O
</s>
<s>
Kickstart	O
3.1	O
was	O
also	O
required	O
,	O
as	O
the	O
operating	B-General_Concept
system	I-General_Concept
did	O
n't	O
include	O
the	O
new	O
ROM	B-Device
.	O
</s>
<s>
A	O
new	O
version	O
of	O
AmigaOS	B-Application
was	O
released	O
on	O
December	O
24	O
,	O
2006	O
after	O
five	O
years	O
of	O
development	O
by	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
(	O
Belgium	O
)	O
under	O
license	O
from	O
Amiga	B-Device
,	O
Inc	O
.	O
for	O
AmigaOne	B-Device
registered	O
users	O
.	O
</s>
<s>
During	O
the	O
five	O
years	O
of	O
development	O
,	O
users	O
of	O
AmigaOne	B-Device
machines	O
could	O
download	O
from	O
Hyperion	O
repository	O
Pre-Release	O
Versions	O
of	O
AmigaOS	B-Application
4.0	O
as	O
long	O
as	O
these	O
were	O
made	O
available	O
.	O
</s>
<s>
As	O
witnessed	O
by	O
many	O
users	O
into	O
Amiga	B-Device
discussion	O
forum	O
sites	O
,	O
these	O
versions	O
were	O
stable	O
and	O
reliable	O
,	O
despite	O
the	O
fact	O
that	O
they	O
are	O
technically	O
labeled	O
as	O
"	O
pre-releases	O
"	O
.	O
</s>
<s>
Last	O
stable	O
version	O
of	O
AmigaOS	B-Application
4.0	O
for	O
AmigaOne	B-Device
computers	O
is	O
the	O
"	O
July	O
2007	O
Update	O
"	O
,	O
released	O
for	O
download	O
18	O
July	O
2007	O
to	O
the	O
registered	O
users	O
of	O
AmigaOne	B-Device
machines	O
.	O
</s>
<s>
AmigaOS	B-Application
4	O
Classic	O
was	O
released	O
commercially	O
for	O
older	O
Amiga	B-Device
computers	I-Device
with	O
CyberstormPPC	O
and	O
BlizzardPPC	O
accelerator	O
cards	O
in	O
November	O
2007	O
.	O
</s>
<s>
The	O
new	O
version	O
is	O
PowerPC-native	O
,	O
finally	O
abandoning	O
the	O
Motorola	B-Device
68k	I-Device
processor	B-General_Concept
.	O
</s>
<s>
AmigaOS	B-Application
4.0	O
will	O
run	O
on	O
some	O
PowerPC	B-Architecture
hardware	O
,	O
which	O
currently	O
only	O
includes	O
A1200	B-Application
,	O
A3000	B-Device
and	O
A4000	B-Device
with	O
PowerPC	B-Architecture
accelerator	O
boards	O
and	O
AmigaOne	B-Device
motherboards	O
.	O
</s>
<s>
Amiga	B-Device
,	O
Inc.	O
'	O
s	O
distribution	O
policies	O
for	O
AmigaOS	B-Application
4.0	O
and	O
any	O
later	O
versions	O
require	O
that	O
for	O
third-party	O
hardware	O
the	O
OS	O
must	O
be	O
bundled	O
with	O
it	O
,	O
with	O
the	O
sole	O
exception	O
of	O
Amigas	B-Device
with	O
Phase	O
5	O
PowerPC	B-Architecture
accelerator	O
boards	O
,	O
for	O
which	O
the	O
OS	O
will	O
be	O
sold	O
separately	O
.	O
</s>
<s>
AmigaOS	B-Application
4.0	O
Final	O
introduced	O
a	O
new	O
memory	O
system	O
based	O
on	O
the	O
slab	B-General_Concept
allocator	I-General_Concept
.	O
</s>
<s>
AmigaOS	B-Application
4.1	O
was	O
presented	O
to	O
the	O
public	O
July	O
11	O
,	O
2008	O
,	O
and	O
went	O
on	O
sale	O
September	O
2008	O
.	O
</s>
