<s>
PicoLisp	B-Language
is	O
a	O
programming	O
language	O
,	O
a	O
dialect	O
of	O
the	O
language	O
Lisp	B-Language
.	O
</s>
<s>
It	O
runs	O
on	O
operating	B-General_Concept
systems	I-General_Concept
including	O
Linux	B-Application
and	O
others	O
that	O
are	O
Portable	O
Operating	B-General_Concept
System	I-General_Concept
Interface	O
(	O
POSIX	O
)	O
compliant	O
.	O
</s>
<s>
Its	O
most	O
prominent	O
features	O
are	O
simplicity	O
and	O
minimalism	B-Device
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
released	O
under	O
an	O
MIT	B-License
License	I-License
(	O
X11	O
)	O
.	O
</s>
<s>
PicoLisp	B-Language
does	O
not	O
include	O
Lisp	B-Language
's	O
lambda	B-General_Concept
function	I-General_Concept
.	O
</s>
<s>
A	O
special	O
feature	O
is	O
the	O
intrinsic	O
create	B-General_Concept
,	I-General_Concept
read	I-General_Concept
,	I-General_Concept
update	I-General_Concept
,	I-General_Concept
and	I-General_Concept
delete	I-General_Concept
(	O
CRUD	B-General_Concept
)	O
functioning	O
.	O
</s>
<s>
Persistent	B-Application
symbols	O
are	O
first-class	O
citizens	O
(	O
objects	O
)	O
,	O
they	O
are	O
loaded	O
from	O
database	O
files	O
automatically	O
when	O
accessed	O
,	O
and	O
written	O
back	O
when	O
modified	O
.	O
</s>
<s>
Applications	O
are	O
written	O
using	O
a	O
class	B-Application
hierarchy	I-Application
of	O
entities	B-Architecture
and	I-Architecture
relations	I-Architecture
.	O
</s>
<s>
Other	O
features	O
include	O
:	O
Prolog	B-Language
engine	O
,	O
database	B-General_Concept
engine	I-General_Concept
and	O
database	O
queries	O
,	O
distributed	O
databases	O
,	O
inlining	O
of	O
C	B-Language
language	I-Language
functions	O
and	O
native	O
C	B-Language
function	O
calls	O
,	O
child	O
process	O
management	O
,	O
interprocess	B-Operating_System
communication	I-Operating_System
,	O
browser	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
,	O
and	O
internationalization	B-General_Concept
and	I-General_Concept
localization	I-General_Concept
.	O
</s>
<s>
In	O
the	O
1980s	O
,	O
PicoLisp	B-Language
began	O
development	O
on	O
the	O
Macintosh	B-Device
,	O
and	O
was	O
used	O
in	O
commercial	O
application	O
development	O
since	O
then	O
.	O
</s>
<s>
The	O
design	O
of	O
PicoLisp	B-Language
is	O
most	O
similar	O
to	O
the	O
first	O
version	O
of	O
MacLisp	O
,	O
Interlisp	O
and	O
mainly	O
Portable	O
Standard	O
Lisp	B-Language
.	O
</s>
<s>
It	O
was	O
ported	O
to	O
DOS	B-Device
and	O
SCO	B-Operating_System
Unix	I-Operating_System
.	O
</s>
<s>
Since	O
1993	O
,	O
it	O
was	O
used	O
mainly	O
on	O
Linux	B-Application
.	O
</s>
<s>
The	O
first	O
versions	O
were	O
written	O
in	O
a	O
mix	O
of	O
C	B-Language
and	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
In	O
1999	O
,	O
a	O
first	O
rewrite	O
from	O
scratch	O
was	O
done	O
,	O
fully	O
in	O
C	B-Language
.	O
In	O
2002	O
,	O
that	O
version	O
was	O
released	O
under	O
a	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GNU	B-License
GPL	I-License
)	O
.	O
</s>
<s>
In	O
2010	O
,	O
it	O
changed	O
to	O
an	O
MIT/X11	B-License
license	I-License
.	O
</s>
<s>
In	O
2009	O
,	O
the	O
64-bit	B-Device
version	O
was	O
released	O
,	O
another	O
rewrite	O
,	O
this	O
time	O
written	O
in	O
generic	O
assembly	O
,	O
which	O
in	O
turn	O
is	O
implemented	O
in	O
PicoLisp	B-Language
.	O
</s>
<s>
This	O
version	O
adds	O
support	O
for	O
coroutines	B-Architecture
.	O
</s>
<s>
In	O
December	O
2010	O
,	O
a	O
Java	B-Language
version	O
named	O
Ersatz	O
PicoLisp	B-Language
was	O
released	O
.	O
</s>
<s>
In	O
September	O
2014	O
,	O
Burger	O
announced	O
the	O
PilMCU	O
project	O
on	O
the	O
PicoLisp	B-Language
development	O
listserv	B-Protocol
,	O
an	O
effort	O
with	O
George	O
Orais	O
to	O
implement	O
PicoLisp	B-Language
in	O
hardware	O
directly	O
.	O
</s>
<s>
In	O
July	O
2015	O
,	O
Burger	O
announced	O
PilOS	O
-	O
The	O
PicoLisp	B-Language
Operating	B-General_Concept
System	I-General_Concept
,	O
a	O
minimal	O
prototype	O
based	O
on	O
the	O
modification	O
of	O
PilMCU	O
targeting	O
embedded	O
applications	O
.	O
</s>
<s>
It	O
runs	O
on	O
standard	O
x86-64	O
PC	O
hardware	O
,	O
directly	O
off	O
the	O
BIOS	O
and	O
includes	O
all	O
the	O
features	O
of	O
64-bit	B-Device
PicoLisp	B-Language
(	O
minus	O
native	O
function	O
calls	O
,	O
due	O
to	O
the	O
fact	O
there	O
is	O
no	O
other	O
native	O
environment	O
such	O
as	O
the	O
C	B-Language
standard	O
library	O
)	O
;	O
in	O
principle	O
,	O
it	O
works	O
as	O
its	O
own	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
In	O
the	O
summer	O
of	O
2016	O
,	O
development	O
of	O
PilBox	O
(	O
"	O
PicoLisp	B-Language
Box	O
"	O
)	O
–	O
a	O
generic	O
Android	B-Application
app	B-Application
allowing	O
to	O
write	O
apps	O
in	O
pure	O
PicoLisp	B-Language
–	O
was	O
started	O
.	O
</s>
<s>
In	O
2021	O
,	O
PicoLisp	B-Language
was	O
re-implemented	O
in	O
LLVM	B-Application
and	O
released	O
as	O
pil21	O
.	O
</s>
<s>
The	O
source	O
language	O
which	O
is	O
compiled	O
to	O
LLVM-IR	O
is	O
also	O
in	O
PicoLisp	B-Language
syntax	O
.	O
</s>
