<s>
MP/M	O
(	O
Multi-Programming	B-Operating_System
Monitor	O
Control	O
Program	O
)	O
is	O
a	O
discontinued	O
multi-user	O
version	O
of	O
the	O
CP/M	B-Application
operating	I-Application
system	I-Application
,	O
created	O
by	O
Digital	O
Research	O
developer	O
Tom	O
Rolander	O
in	O
1979	O
.	O
</s>
<s>
It	O
allowed	O
multiple	O
users	O
to	O
connect	O
to	O
a	O
single	O
computer	O
,	O
each	O
using	O
a	O
separate	O
terminal	B-General_Concept
.	O
</s>
<s>
MP/M	O
was	O
a	O
fairly	O
advanced	O
operating	B-General_Concept
system	I-General_Concept
for	O
its	O
era	O
,	O
at	O
least	O
on	O
microcomputers	B-Architecture
.	O
</s>
<s>
It	O
included	O
a	O
priority-scheduled	O
multitasking	B-Operating_System
kernel	B-Operating_System
(	O
before	O
such	O
a	O
name	O
was	O
used	O
,	O
the	O
kernel	B-Operating_System
was	O
referred	O
to	O
as	O
the	O
nucleus	B-Operating_System
)	O
with	O
memory	O
protection	O
,	O
concurrent	O
input/output	B-General_Concept
(	O
XIOS	O
)	O
and	O
support	O
for	O
spooling	O
and	O
queueing	O
.	O
</s>
<s>
The	O
8-bit	O
system	O
required	O
a	O
8080	B-General_Concept
(	O
or	O
Z80	B-General_Concept
)	O
CPU	B-General_Concept
and	O
a	O
minimum	O
of	O
32KB	O
of	O
RAM	B-Architecture
to	O
run	O
,	O
but	O
this	O
left	O
little	O
memory	O
for	O
user	O
applications	O
.	O
</s>
<s>
So	O
for	O
instance	O
a	O
program	O
might	O
be	O
loaded	O
into	O
a	O
"	O
bank	O
"	O
of	O
RAM	B-Architecture
that	O
was	O
not	O
addressable	O
by	O
the	O
CPU	B-General_Concept
,	O
and	O
when	O
it	O
was	O
time	O
for	O
the	O
program	O
to	O
run	O
that	O
bank	O
of	O
RAM	B-Architecture
would	O
be	O
"	O
switched	O
"	O
to	O
appear	O
in	O
low	O
memory	O
(	O
typically	O
the	O
lower	O
32	O
or	O
48KB	O
)	O
and	O
thus	O
become	O
visible	O
to	O
the	O
OS	O
.	O
</s>
<s>
This	O
technique	O
,	O
known	O
as	O
bank	B-General_Concept
switching	I-General_Concept
was	O
subsequently	O
added	O
to	O
the	O
single	O
user	O
version	O
of	O
CP/M	B-Application
with	O
version	O
3.0	O
.	O
</s>
<s>
One	O
of	O
the	O
primary	O
uses	O
of	O
MP/M	O
,	O
perhaps	O
to	O
the	O
surprise	O
of	O
DRI	O
,	O
was	O
as	O
a	O
"	O
power	O
user	O
"	O
version	O
of	O
CP/M	B-Application
for	O
a	O
single	O
user	O
.	O
</s>
<s>
Like	O
CP/M	B-Application
,	O
MP/M	O
was	O
eventually	O
ported	O
to	O
the	O
16-bit	O
Intel	B-General_Concept
8086	I-General_Concept
,	O
and	O
appeared	O
as	O
MP/M	O
-86	O
2.0	O
in	O
September	O
1981	O
.	O
</s>
<s>
MP/M	O
-86	O
2.1	O
absorbed	O
some	O
of	O
the	O
technology	O
of	O
CP/M	B-Operating_System
-86	I-Operating_System
1.1	O
(	O
BDOS	O
2.2	O
)	O
to	O
become	O
Concurrent	B-Operating_System
CP/M	I-Operating_System
-86	I-Operating_System
3.0	O
(	O
BDOS	O
3.0	O
)	O
in	O
late	O
1982	O
,	O
which	O
also	O
added	O
support	O
for	O
"	O
virtual	O
screens	O
"	O
.	O
</s>
<s>
Kathryn	O
Strutynski	O
,	O
the	O
project	O
manager	O
for	O
CP/M	B-Operating_System
-86	I-Operating_System
,	O
continued	O
as	O
project	O
manager	O
for	O
Concurrent	B-Operating_System
CP/M	I-Operating_System
-86	I-Operating_System
.	O
</s>
<s>
In	O
December	O
1983	O
,	O
a	O
DOS	O
emulator	O
named	O
PC-MODE	O
became	O
available	O
as	O
an	O
optional	O
module	O
for	O
Concurrent	B-Operating_System
CP/M	I-Operating_System
-86	I-Operating_System
3.1	O
(	O
BDOS	O
3.1	O
)	O
,	O
shipping	O
on	O
21	O
February	O
1984	O
,	O
and	O
the	O
system	O
was	O
further	O
developed	O
into	O
the	O
MS-DOS	B-Application
compatible	O
Concurrent	B-Operating_System
DOS	I-Operating_System
(	O
BDOS	O
3.1	O
and	O
higher	O
)	O
.	O
</s>
<s>
This	O
in	O
turn	O
continued	O
to	O
evolve	O
into	O
FlexOS	B-Operating_System
and	O
Multiuser	B-Operating_System
DOS	I-Operating_System
and	O
as	O
such	O
is	O
still	O
in	O
use	O
in	O
some	O
industrial	O
applications	O
.	O
</s>
<s>
MP/M	O
8-16	O
(	O
sometimes	O
also	O
referred	O
to	O
as	O
MP/M-8/16	O
)	O
was	O
CompuPro	O
's	O
name	O
for	O
a	O
combination	O
of	O
the	O
multi-user	O
16-bit	O
MP/M	O
-86	O
to	O
perform	O
single-user	O
,	O
single-stream	O
CP/M	B-Application
functions	O
,	O
along	O
with	O
multi-user	O
,	O
multi-tasking	O
8-bit	O
MP/M	O
operations	O
running	O
on	O
the	O
multi-processor	B-Operating_System
.	O
</s>
<s>
Later	O
on	O
,	O
this	O
system	O
was	O
also	O
able	O
to	O
run	O
Concurrent	B-Operating_System
DOS	I-Operating_System
3.1	O
.	O
</s>
<s>
In	O
1982	O
,	O
Digital	O
Research	O
announced	O
plans	O
to	O
develop	O
MP/M	B-Operating_System
-286	I-Operating_System
to	O
take	O
advantage	O
of	O
the	O
16-bit	O
Intel	B-General_Concept
80286	I-General_Concept
's	O
new	O
memory	O
management	O
and	O
protection	O
features	O
to	O
run	O
existing	O
MP/M	O
-86	O
and	O
CP/M	B-Operating_System
-86	I-Operating_System
applications	O
.	O
</s>
<s>
This	O
was	O
apparently	O
never	O
published	O
"	O
as	O
is	O
"	O
,	O
but	O
was	O
further	O
developed	O
into	O
Concurrent	B-Operating_System
CP/M	I-Operating_System
-286	O
,	O
which	O
seems	O
to	O
have	O
formed	O
the	O
basis	O
for	O
the	O
later	O
Concurrent	B-Operating_System
DOS	I-Operating_System
286	I-Operating_System
in	O
1985	O
and	O
FlexOS	B-Operating_System
286	I-Operating_System
in	O
1986	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
are	O
supported	O
by	O
the	O
MP/M	O
II	O
Console	B-Application
Command	I-Application
Processor	O
CCP	O
:	O
</s>
<s>
In	O
the	O
early	O
1980s	O
Digital	O
Research	O
also	O
developed	O
networking	O
software	O
named	O
CP/NET	O
used	O
to	O
connect	O
an	O
MP/M	O
server	O
with	O
multiple	O
CP/NET	O
clients	O
(	O
named	O
requesters	O
)	O
running	O
CP/M	B-Application
.	O
</s>
<s>
MP/NET	O
was	O
an	O
MP/M	O
system	O
with	O
networking	O
allowing	O
the	O
MP/M	O
system	O
to	O
function	O
as	O
both	O
requester	O
and	O
server	O
with	O
CP/M	B-Application
requesters	O
.	O
</s>
<s>
The	O
CP/NET	O
clients	O
could	O
also	O
be	O
run	O
in	O
a	O
diskless	O
configuration	O
with	O
the	O
system	O
stored	O
in	O
ROM	O
,	O
then	O
named	O
CP/NOS	O
(	O
with	O
NOS	O
for	O
Network	O
Operating	B-General_Concept
System	I-General_Concept
)	O
.	O
</s>
<s>
CP/NET	O
existed	O
in	O
versions	O
1.0	O
,	O
1.1	O
and	O
1.2	O
in	O
versions	O
for	O
8080	B-General_Concept
and	O
Z80	B-General_Concept
processors	O
.	O
</s>
<s>
CP/NET	O
-86	O
for	O
8086	B-General_Concept
was	O
available	O
as	O
well	O
.	O
</s>
<s>
Caldera	O
permitted	O
the	O
redistribution	O
and	O
modification	O
of	O
all	O
original	O
Digital	O
Research	O
files	O
,	O
including	O
source	O
code	O
,	O
related	O
to	O
the	O
CP/M	B-Application
and	O
MP/M	O
families	O
through	O
Tim	O
Olmstead	O
's	O
"	O
The	O
Unofficial	O
CP/M	B-Application
Web	O
site	O
"	O
since	O
1997	O
.	O
</s>
