<s>
EINE	B-Operating_System
and	I-Operating_System
ZWEI	I-Operating_System
are	O
two	O
discontinued	O
Emacs-like	O
text	B-Application
editors	I-Application
developed	O
by	O
Daniel	O
Weinreb	O
and	O
Mike	O
McMahon	O
for	O
Lisp	B-Operating_System
machines	I-Operating_System
in	O
the	O
1970s	O
and	O
1980s	O
.	O
</s>
<s>
EINE	B-Operating_System
was	O
a	O
text	B-Application
editor	I-Application
developed	O
in	O
the	O
late	O
1970s	O
.	O
</s>
<s>
In	O
terms	O
of	O
features	O
,	O
its	O
goal	O
was	O
to	O
"	O
do	O
what	O
Stallman	O
's	O
PDP-10	O
(	O
original	O
)	O
Emacs	B-Application
does	O
"	O
.	O
</s>
<s>
It	O
was	O
an	O
early	O
example	O
of	O
what	O
would	O
become	O
many	O
Emacs-like	O
text	B-Application
editors	I-Application
.	O
</s>
<s>
Unlike	O
the	O
original	O
TECO-based	O
Emacs	B-Application
,	O
but	O
like	O
Multics	B-Operating_System
Emacs	I-Operating_System
,	O
EINE	B-Operating_System
was	O
written	O
in	O
Lisp	O
.	O
</s>
<s>
It	O
used	O
Lisp	B-Language
Machine	I-Language
Lisp	I-Language
.	O
</s>
<s>
Stallman	O
later	O
wrote	O
GNU	B-Application
Emacs	I-Application
,	O
which	O
was	O
written	O
in	O
C	B-Language
and	O
Emacs	B-Operating_System
Lisp	I-Operating_System
and	O
extensible	O
in	O
Emacs	B-Operating_System
Lisp	I-Operating_System
.	O
</s>
<s>
EINE	B-Operating_System
also	O
made	O
use	O
of	O
the	O
window	O
system	O
of	O
the	O
Lisp	B-Operating_System
machine	I-Operating_System
and	O
was	O
the	O
first	O
Emacs	B-Application
to	O
have	O
a	O
graphical	O
user	O
interface	O
.	O
</s>
<s>
In	O
the	O
1980s	O
,	O
EINE	B-Operating_System
was	O
developed	O
into	O
ZWEI	B-Operating_System
.	O
</s>
<s>
Innovations	O
included	O
programmability	O
in	O
Lisp	B-Language
Machine	I-Language
Lisp	I-Language
,	O
and	O
a	O
new	O
and	O
more	O
flexible	O
doubly	B-Data_Structure
linked	I-Data_Structure
list	I-Data_Structure
method	O
of	O
internally	O
representing	B-General_Concept
buffers	O
.	O
</s>
<s>
ZWEI	B-Operating_System
would	O
eventually	O
become	O
the	O
editor	O
library	O
used	O
for	O
Symbolics	O
 '	O
Zmacs	B-Operating_System
(	O
Emacs-like	O
editor	O
)	O
,	O
Zmail	O
(	O
mail	O
client	O
)	O
,	O
and	O
Converse	O
(	O
message	O
client	O
)	O
,	O
which	O
were	O
integrated	O
into	O
the	O
Genera	B-Application
operating	I-Application
system	I-Application
which	O
Symbolics	O
developed	O
for	O
their	O
Lisp	B-Operating_System
machines	I-Operating_System
.	O
</s>
<s>
EINE	B-Operating_System
is	O
a	O
recursive	O
acronym	O
for	O
"	O
EINE	B-Operating_System
Is	O
Not	O
Emacs	B-Application
"	O
,	O
coined	O
in	O
August	O
1977	O
.	O
</s>
<s>
It	O
was	O
a	O
play	O
on	O
Ted	O
Anderson	O
's	O
TINT	O
,	O
"	O
TINT	O
is	O
not	O
TECO	B-Application
"	O
.	O
</s>
<s>
Anderson	O
would	O
later	O
retort	O
with	O
"	O
SINE	O
is	O
not	O
EINE	B-Operating_System
"	O
.	O
</s>
<s>
ZWEI	B-Operating_System
follows	O
this	O
pattern	O
as	O
an	O
acronym	O
for	O
"	O
ZWEI	B-Operating_System
Was	O
Eine	B-Operating_System
Initially	O
"	O
.	O
</s>
<s>
With	O
"	O
zwei	B-Operating_System
"	O
being	O
the	O
German	O
word	O
for	O
"	O
two	O
"	O
,	O
"	O
EINE	B-Operating_System
"	O
could	O
be	O
(	O
re	O
-	O
)	O
interpreted	O
as	O
being	O
a	O
reference	O
to	O
the	O
German	O
word	O
for	O
"	O
one	O
"	O
(	O
in	O
the	O
feminine	O
adjectival	O
form	O
,	O
as	O
in	O
"	O
eine	B-Operating_System
Implementierung	O
"	O
,	O
"	O
one	O
implementation	O
"	O
)	O
.	O
</s>
