<s>
mt	B-Operating_System
Xinu	I-Operating_System
(	O
from	O
the	O
letters	O
in	O
"	O
Unix™	O
"	O
,	O
reversed	O
)	O
was	O
a	O
software	O
company	O
founded	O
in	O
1983	O
that	O
produced	O
two	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Its	O
slogan	O
"	O
We	O
know	O
Unix™	O
backwards	O
and	O
forwards	O
"	O
was	O
an	O
allusion	O
to	O
the	O
company	O
's	O
name	O
and	O
abilities	O
.	O
</s>
<s>
mt	B-Operating_System
Xinu	I-Operating_System
offered	O
several	O
products	O
:	O
</s>
<s>
mt	B-Operating_System
Xinu	I-Operating_System
was	O
a	O
commercially	O
licensed	O
version	O
of	O
the	O
BSD	B-Operating_System
Unix	I-Operating_System
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
DEC	B-Device
VAX	I-Device
.	O
</s>
<s>
more/BSD	B-Operating_System
was	O
mt	B-Operating_System
Xinu	I-Operating_System
's	O
version	O
of	O
4.3BSD-Tahoe	O
for	O
VAX	B-Device
and	O
HP	B-Device
9000	I-Device
,	O
incorporating	O
code	O
from	O
the	O
University	O
of	O
Utah	O
's	O
HPBSD	O
.	O
</s>
<s>
It	O
included	O
NFS	B-Protocol
.	O
</s>
<s>
Mach386	B-Operating_System
was	O
a	O
hybrid	O
of	O
Mach	B-Operating_System
2.5/2.6	I-Operating_System
and	O
4.3BSD-Tahoe/Reno	O
for	O
386	B-General_Concept
and	O
486-based	O
IBM	O
PC	O
compatibles	O
.	O
</s>
<s>
Apart	O
from	O
operating	B-General_Concept
systems	I-General_Concept
,	O
mt	B-Operating_System
Xinu	I-Operating_System
also	O
produced	O
Apple-Unix	O
interoperability	O
software	O
,	O
including	O
an	O
AppleShare	B-General_Concept
server	O
for	O
Unix	B-Application
.	O
</s>
<s>
The	O
company	O
's	O
principals	O
were	O
University	O
of	O
California	O
,	O
Berkeley	O
computer	B-General_Concept
science	I-General_Concept
students	O
and	O
graduates	O
,	O
notably	O
Bob	O
Kridle	O
,	O
Alan	O
Tobey	O
,	O
Ed	O
Gould	O
,	O
and	O
Vance	O
Vaughan	O
.	O
</s>
<s>
mt	B-Operating_System
Xinu	I-Operating_System
is	O
also	O
famous	O
for	O
its	O
light-hearted	O
Unix-themed	O
calendars	O
,	O
including	O
:	O
</s>
<s>
In	O
1991	O
,	O
a	O
division	O
of	O
mt	B-Operating_System
Xinu	I-Operating_System
broke	O
off	O
to	O
become	O
Xinet	O
.	O
</s>
