<s>
The	O
Data	B-Device
General	I-Device
Eclipse	I-Device
line	O
of	O
computers	O
by	O
Data	O
General	O
were	O
16-bit	B-Device
minicomputers	B-Architecture
released	O
in	O
early	O
1974	O
and	O
sold	O
until	O
1988	O
.	O
</s>
<s>
The	O
Eclipse	O
was	O
based	O
on	O
many	O
of	O
the	O
same	O
concepts	O
as	O
the	O
Data	B-Device
General	I-Device
Nova	I-Device
,	O
but	O
included	O
support	O
for	O
virtual	B-Architecture
memory	I-Architecture
and	O
multitasking	B-Operating_System
more	O
suitable	O
to	O
the	O
small	O
office	O
than	O
the	O
lab	O
.	O
</s>
<s>
The	O
Eclipse	O
series	O
was	O
supplanted	O
by	O
the	O
32-bit	O
Data	B-Device
General	I-Device
Eclipse	I-Device
MV/8000	I-Device
in	O
1980	O
.	O
</s>
<s>
The	O
Data	B-Device
General	I-Device
Nova	I-Device
was	O
intended	O
to	O
outperform	O
the	O
PDP-8	B-Device
while	O
being	O
less	O
expensive	O
,	O
and	O
in	O
a	O
similar	O
fashion	O
,	O
the	O
Eclipse	O
was	O
meant	O
to	O
compete	O
against	O
the	O
larger	O
PDP-11	B-Device
computers	O
.	O
</s>
<s>
The	O
stack	O
pointer	O
was	O
added	O
back	O
to	O
the	O
later	O
Nova	O
3	O
machines	O
in	O
1975	O
and	O
also	O
used	O
on	O
the	O
later	O
32-bit	O
Data	B-Device
General	I-Device
Eclipse	I-Device
MV/8000	I-Device
.	O
</s>
<s>
The	O
AOS	O
operating	B-General_Concept
system	I-General_Concept
was	O
quite	O
sophisticated	O
,	O
advanced	O
compared	O
to	O
the	O
PDP-11	B-Device
offerings	O
,	O
with	O
access	O
control	O
lists	O
(	O
ACLs	O
)	O
for	O
file	O
protection	O
.	O
</s>
<s>
The	O
original	O
Cray-1	B-Device
system	O
used	O
an	O
Eclipse	O
to	O
act	O
as	O
a	O
Maintenance	O
and	O
Control	O
Unit	O
(	O
MCU	O
)	O
.	O
</s>
<s>
Its	O
primary	O
purpose	O
was	O
to	O
download	O
an	O
image	O
of	O
either	O
the	O
Cray	B-Operating_System
Operating	I-Operating_System
System	I-Operating_System
or	O
customer	O
engineering	O
diagnostics	O
at	O
boot	O
time	O
.	O
</s>
