<s>
Venix	B-Operating_System
is	O
a	O
discontinued	O
version	O
of	O
the	O
Unix	B-Application
operating	I-Application
system	I-Application
for	O
low-end	O
computers	O
,	O
developed	O
by	O
VenturCom	O
,	O
a	O
"	O
company	O
that	O
specialises	O
in	O
the	O
skinniest	O
implementations	O
of	O
Unix	B-Application
"	O
.	O
</s>
<s>
A	O
working	O
version	O
of	O
Venix/86	B-Operating_System
for	O
the	O
IBM	B-Device
PC	I-Device
XT	I-Device
was	O
demoed	O
at	O
Comdex	O
in	O
May	O
1983	O
.	O
</s>
<s>
It	O
was	O
based	O
on	O
Version	B-Operating_System
7	I-Operating_System
Unix	I-Operating_System
with	O
some	O
enhancements	O
from	O
BSD	B-Operating_System
(	O
notably	O
vi	B-Application
,	O
more	O
and	O
csh	B-Operating_System
)	O
and	O
custom	O
inter-process	B-Operating_System
communication	I-Operating_System
mechanisms	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
licensed	O
UNIX	B-Application
operating	I-Application
system	I-Application
available	O
for	O
the	O
IBM	B-Device
PC	I-Device
and	O
its	O
compatibles	O
,	O
supported	O
read/write	O
access	O
to	O
a	O
separate	O
DOS/FAT	O
-partition	O
and	O
could	O
run	O
in	O
as	O
little	O
as	O
128	O
KB	O
(	O
256	O
KB	O
-	O
512	O
KB	O
recommended	O
)	O
.	O
</s>
<s>
In	O
September	O
1984	O
,	O
Venix/86	B-Operating_System
Encore	I-Operating_System
was	O
released	O
;	O
it	O
supported	O
a	O
number	O
of	O
early	O
PC-compatibles	O
,	O
including	O
the	O
AT&T	B-Operating_System
6300	I-Operating_System
,	O
the	O
Zenith	B-Device
150	I-Device
,	O
the	O
(	O
first	O
)	O
NCR	O
PC	B-Device
,	O
and	O
the	O
Texas	B-Device
Instruments	I-Device
Professional	I-Device
Computer	I-Device
.	O
</s>
<s>
Venix	B-Operating_System
Encore	O
,	O
which	O
then	O
became	O
Venix	B-Operating_System
2.0	I-Operating_System
,	O
was	O
still	O
based	O
on	O
Version	B-Operating_System
7	I-Operating_System
Unix	I-Operating_System
,	O
and	O
ran	O
on	O
the	O
DEC	B-Device
Rainbow	I-Device
100	O
(	O
Venix/86R	B-Operating_System
)	O
as	O
well	O
as	O
PCs	B-Device
(	O
Venix/86	B-Operating_System
and	O
/286	O
)	O
.	O
</s>
<s>
The	O
system	O
contained	O
a	O
number	O
of	O
enhancements	O
,	O
notably	O
tools	O
to	O
access	O
DOS	B-Device
files	O
directly	O
on	O
a	O
DOS/FAT	O
-partition	O
,	O
and	O
an	O
updated	O
ADB	B-Application
debugger	I-Application
.	O
</s>
<s>
Confusingly	O
,	O
Venix	B-Operating_System
2.0	I-Operating_System
for	O
the	O
DEC	O
PRO-380	B-Device
microcomputer	B-Architecture
(	O
Venix/PRO	O
)	O
was	O
based	O
"	O
essentially	O
"	O
on	O
System	B-Operating_System
III	I-Operating_System
.	O
</s>
<s>
It	O
no	O
longer	O
ran	O
on	O
the	O
PRO-350	B-Device
.	O
</s>
<s>
This	O
is	O
made	O
clear	O
in	O
the	O
ckermit	O
4E	O
build	O
instructions	O
,	O
which	O
has	O
a	O
special	O
target	O
for	O
Pro	O
running	O
Venix	B-Operating_System
1.0	O
,	O
but	O
instructs	O
the	O
user	O
to	O
use	O
the	O
sysiii	O
target	O
for	O
the	O
Pro	O
running	O
Venix	B-Operating_System
2.0	I-Operating_System
.	O
</s>
<s>
These	O
same	O
sources	O
also	O
make	O
it	O
clear	O
that	O
Venix	B-Operating_System
had	O
an	O
enhanced	O
TTY	O
interface	O
relative	O
to	O
a	O
pure	O
V7	B-Operating_System
Unix	I-Operating_System
System	O
.	O
</s>
<s>
Venix	B-Operating_System
2.1	I-Operating_System
was	O
released	O
for	O
at	O
least	O
the	O
PC	B-Device
.	O
</s>
<s>
Like	O
the	O
original	O
Venix/86	B-Operating_System
,	O
it	O
included	O
a	O
C	B-Language
compiler	O
,	O
a	O
BASIC	O
interpreter	O
and	O
added	O
a	O
Fortran	O
77	O
compiler	O
as	O
an	O
option	O
.	O
</s>
<s>
In	O
November	O
1985	O
,	O
Unisource	O
Software	O
Corp.	O
,	O
a	O
Venix	B-Operating_System
retailer	O
,	O
announced	O
the	O
availability	O
of	O
RM/Cobol	O
for	O
Venix	B-Operating_System
.	O
</s>
<s>
From	O
version	O
3.0	O
,	O
Venix	B-Operating_System
was	O
based	O
on	O
System	B-Operating_System
V	I-Operating_System
.	O
A	O
real-time	B-Operating_System
version	O
based	O
on	O
System	O
V.3.2	O
was	O
released	O
for	O
the	O
386	B-General_Concept
in	O
1990	O
.	O
</s>
<s>
The	O
last	O
version	O
,	O
Venix	B-Operating_System
4.2.1	I-Operating_System
,	O
based	O
on	O
UNIX	B-Operating_System
System	I-Operating_System
V	I-Operating_System
Release	O
4.2	O
(	O
UnixWare	B-Operating_System
)	O
,	O
was	O
released	O
in	O
1994	O
.	O
</s>
<s>
The	O
workstation	O
system	O
included	O
the	O
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
NFS	B-Protocol
and	O
TCP/IP	B-Protocol
networking	O
,	O
X	B-Operating_System
,	O
OpenLook	B-Operating_System
and	O
Motif	B-Application
GUIs	O
,	O
and	O
the	O
Veritas	O
journaling	O
File	O
System	O
(	O
vxfs	B-Application
)	O
.	O
</s>
<s>
A	O
development	O
system	O
included	O
additionally	O
an	O
ANSI	O
C	B-Language
compiler	O
,	O
a	O
library	O
of	O
real-time	B-Operating_System
functions	O
,	O
GUI	O
development	O
software	O
,	O
real-time	B-Operating_System
development	O
utilities	O
,	O
and	O
selected	O
industrial	O
I/O	O
device	O
drivers	O
.	O
</s>
<s>
In	O
its	O
1984	O
review	O
PC	B-Device
Magazine	O
found	O
Venix	B-Operating_System
functional	O
,	O
despite	O
some	O
bugs	O
in	O
the	O
initial	O
versions	O
.	O
</s>
<s>
Its	O
use	O
of	O
the	O
BIOS	B-Operating_System
for	O
accessing	O
devices	O
made	O
it	O
more	O
portable	O
than	O
its	O
competitor	O
PC/IX	B-Operating_System
,	O
but	O
slowed	O
down	O
its	O
display	O
processing	O
;	O
the	O
disk	O
access	O
speed	O
was	O
found	O
to	O
be	O
similar	O
.	O
</s>
<s>
BYTE	O
stated	O
that	O
Venix	B-Operating_System
on	O
the	O
DEC	B-Device
Professional	I-Device
and	O
IBM	B-Device
PC	I-Device
"	O
performed	O
adequately	O
,	O
"	O
but	O
criticized	O
its	O
limit	O
on	O
background	B-Operating_System
processes	I-Operating_System
.	O
</s>
