<s>
The	O
Data	B-Operating_System
General	I-Operating_System
RDOS	I-Operating_System
(	O
Real-time	O
Disk	O
Operating	B-General_Concept
System	I-General_Concept
)	O
is	O
a	O
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
released	O
in	O
1970	O
.	O
</s>
<s>
The	O
software	O
was	O
bundled	O
with	O
the	O
company	O
's	O
popular	O
Nova	B-Device
and	O
Eclipse	B-Device
minicomputers	B-Architecture
.	O
</s>
<s>
RDOS	O
is	O
capable	O
of	O
multitasking	B-Operating_System
,	O
with	O
the	O
ability	O
to	O
run	O
up	O
to	O
32	O
tasks	O
(	O
similar	O
to	O
the	O
current	O
term	O
threads	B-Operating_System
)	O
simultaneously	O
on	O
each	O
of	O
two	O
grounds	B-Operating_System
(	O
foreground	B-Operating_System
and	I-Operating_System
background	I-Operating_System
)	O
within	O
a	O
64KB	O
memory	O
space	O
.	O
</s>
<s>
Later	O
versions	O
of	O
RDOS	O
are	O
compatible	O
with	O
Data	O
General	O
's	O
16-bit	B-Device
Eclipse	B-Device
minicomputer	B-Architecture
line	O
.	O
</s>
<s>
A	O
cut-down	O
version	O
of	O
RDOS	O
,	O
without	O
real-time	O
background	O
and	O
foreground	O
capability	O
but	O
still	O
capable	O
of	O
running	O
multiple	O
threads	B-Operating_System
and	O
multi-user	O
Data	B-Language
General	I-Language
Business	I-Language
Basic	I-Language
,	O
is	O
called	O
Data	B-Operating_System
General	I-Operating_System
Diskette	I-Operating_System
Operating	I-Operating_System
System	I-Operating_System
(	O
DG-DOS	B-Operating_System
or	O
now	O
—	O
somewhat	O
confusingly	O
—	O
simply	O
DOS	O
)	O
;	O
another	O
related	O
operating	B-General_Concept
system	I-General_Concept
is	O
RTOS	B-Operating_System
,	O
a	O
Real-Time	B-Operating_System
Operating	I-Operating_System
System	I-Operating_System
for	O
diskless	O
environments	O
.	O
</s>
<s>
RDOS	O
on	O
microNOVA-based	O
"	O
Micro	O
Products	O
"	O
micro-minicomputers	O
is	O
sometimes	O
called	O
DG/RDOS	O
.	O
</s>
<s>
RDOS	O
was	O
superseded	O
in	O
the	O
early	O
1980s	O
by	O
Data	O
General	O
's	O
AOS	O
family	O
of	O
operating	B-General_Concept
systems	I-General_Concept
,	O
including	O
AOS/VS	O
and	O
MP/AOS	O
(	O
MP/OS	O
on	O
smaller	O
systems	O
)	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
are	O
supported	O
by	O
the	O
RDOS/DOS	O
CLI	O
.	O
</s>
<s>
In	O
the	O
late	O
1970s	O
,	O
Data	O
General	O
was	O
sued	O
(	O
under	O
the	O
Sherman	O
and	O
Clayton	O
antitrust	O
acts	O
)	O
by	O
competitors	O
for	O
their	O
practice	O
of	O
bundling	O
RDOS	O
with	O
the	O
Data	B-Device
General	I-Device
Nova	I-Device
or	O
Eclipse	B-Device
minicomputer	B-Architecture
.	O
</s>
<s>
When	O
Data	O
General	O
introduced	O
the	O
Data	B-Device
General	I-Device
Nova	I-Device
,	O
a	O
company	O
called	O
Digidyne	O
wanted	O
to	O
use	O
its	O
RDOS	O
operating	B-General_Concept
system	I-General_Concept
on	O
its	O
own	O
hardware	B-General_Concept
clone	I-General_Concept
.	O
</s>
<s>
Data	O
General	O
refused	O
to	O
license	B-License
their	I-License
software	I-License
and	O
claimed	O
their	O
"	O
bundling	O
rights	O
"	O
.	O
</s>
<s>
The	O
precedent	O
set	O
by	O
the	O
lower	O
courts	O
eventually	O
forced	O
Data	O
General	O
to	O
license	O
the	O
operating	B-General_Concept
system	I-General_Concept
because	O
restricting	O
the	O
software	O
to	O
only	O
Data	O
General	O
's	O
hardware	O
was	O
an	O
illegal	O
tying	O
arrangement	O
.	O
</s>
