<s>
AberMUD	B-Protocol
was	O
the	O
first	O
popular	O
open	B-Application
source	I-Application
MUD	B-Application
.	O
</s>
<s>
The	O
first	O
version	O
was	O
written	O
in	O
B	B-Language
by	O
Alan	O
Cox	O
,	O
Richard	O
Acott	O
,	O
Jim	O
Finnis	O
,	O
and	O
Leon	O
Thrane	O
based	O
at	O
University	O
of	O
Wales	O
,	O
Aberystwyth	O
for	O
an	O
old	O
Honeywell	O
mainframe	B-Architecture
and	O
opened	O
in	O
1987	O
.	O
</s>
<s>
The	O
gameplay	O
was	O
heavily	O
influenced	O
by	O
MUD1	B-Protocol
,	O
created	O
by	O
Roy	B-Protocol
Trubshaw	I-Protocol
and	O
Richard	O
Bartle	O
at	O
the	O
University	O
of	O
Essex	O
,	O
which	O
Alan	O
Cox	O
had	O
played	O
.	O
</s>
<s>
In	O
late	O
1988	O
,	O
AberMUD	B-Protocol
was	O
ported	O
to	O
C	B-Language
by	O
Alan	O
Cox	O
so	O
it	O
could	O
run	O
on	O
Unix	B-Application
at	O
Southampton	O
University	O
's	O
Maths	O
machines	O
.	O
</s>
<s>
In	O
early	O
1989	O
,	O
there	O
were	O
three	O
instances	O
of	O
AberMUD	B-Protocol
running	O
in	O
the	O
UK	O
,	O
the	O
Southampton	O
one	O
,	O
one	O
at	O
Leeds	O
University	O
and	O
a	O
third	O
at	O
the	O
IBM	O
PC	O
User	O
Group	O
in	O
London	O
,	O
run	O
by	O
Ian	O
Smith	O
.	O
</s>
<s>
Bill	O
Wisner	O
subsequently	O
spread	O
AberMUD	B-Protocol
around	O
the	O
world	O
.	O
</s>
<s>
AberMUD3	O
was	O
renamed	O
AberMUD	B-Protocol
II	O
by	O
Rich	B-Application
Salz	I-Application
in	O
February	O
1989	O
after	O
he	O
cleaned	O
up	O
the	O
source	O
code	O
and	O
ported	O
it	O
to	O
UNIX	B-Application
.	O
</s>
<s>
In	O
1991	O
,	O
Alan	O
Cox	O
wrote	O
AberMUD	B-Protocol
IV	O
(	O
unrelated	O
to	O
AberMUD	B-Protocol
4	O
)	O
and	O
then	O
AberMUD	B-Protocol
V	O
,	O
which	O
was	O
also	O
used	O
,	O
with	O
graphical	O
extensions	O
,	O
in	O
the	O
Elvira	O
game	O
by	O
Horror	O
Soft	O
,	O
a	O
trading	O
name	O
of	O
Adventure	O
Soft	O
.	O
</s>
<s>
AberMUD	B-Protocol
V	O
was	O
later	O
released	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
Their	O
May	O
1993	O
final	O
release	O
of	O
Dirt	O
3.1.2	O
is	O
used	O
by	O
most	O
of	O
the	O
remaining	O
AberMUD	B-Protocol
games	O
on	O
the	O
internet	O
.	O
</s>
<s>
AberMUD	B-Protocol
's	O
legacy	O
lives	O
on	O
in	O
the	O
three	O
major	O
codebases	B-General_Concept
it	O
inspired	O
:	O
TinyMUD	O
,	O
LPMud	B-Application
and	O
DikuMUD	B-Application
.	O
</s>
