<s>
Gary	O
Kildall	O
in	O
1973	O
for	O
Hank	O
Smith	O
at	O
Intel	O
for	O
its	O
microprocessors	B-Device
.	O
</s>
<s>
The	O
language	O
incorporated	O
ideas	O
from	O
PL/I	B-Language
,	O
ALGOL	B-Language
and	O
XPL	B-Language
,	O
and	O
had	O
an	O
integrated	O
macro	O
processor	O
.	O
</s>
<s>
As	O
a	O
graduate	O
of	O
the	O
University	O
of	O
Washington	O
Kildall	O
had	O
used	O
their	O
Burroughs	O
B5500	O
computer	O
,	O
and	O
as	O
such	O
was	O
aware	O
of	O
the	O
potential	O
of	O
high-level	O
languages	O
such	O
as	O
ESPOL	B-Language
for	O
systems	O
programming	O
.	O
</s>
<s>
Unlike	O
other	O
contemporary	O
languages	O
such	O
as	O
Pascal	B-Application
,	O
C	B-Language
or	O
BASIC	O
,	O
PL/M	B-Language
had	O
no	O
standard	O
input	O
or	O
output	O
routines	O
.	O
</s>
<s>
It	O
included	O
features	O
targeted	O
at	O
the	O
low-level	O
hardware	O
specific	O
to	O
the	O
target	O
microprocessors	B-Device
,	O
and	O
as	O
such	O
,	O
it	O
could	O
support	O
direct	O
access	O
to	O
any	O
location	O
in	O
memory	O
,	O
I/O	O
ports	O
and	O
the	O
processor	O
interrupt	O
flags	O
in	O
a	O
very	O
efficient	O
manner	O
.	O
</s>
<s>
PL/M	B-Language
was	O
the	O
first	O
higher	O
level	O
programming	O
language	O
for	O
microprocessor-based	O
computers	O
and	O
was	O
the	O
original	O
implementation	O
language	O
for	O
those	O
parts	O
of	O
the	O
CP/M	B-Application
operating	I-Application
system	I-Application
which	O
were	O
not	O
written	O
in	O
assembler	O
.	O
</s>
<s>
Many	O
Intel	O
and	O
Zilog	O
Z80-based	O
embedded	B-Architecture
systems	I-Architecture
were	O
programmed	O
in	O
PL/M	B-Language
during	O
the	O
1970s	O
and	O
1980s	O
.	O
</s>
<s>
For	O
instance	O
,	O
the	O
firmware	B-Application
of	O
the	O
Service	O
Processor	O
component	O
of	O
CISC	O
IBM	B-Device
AS/400	I-Device
was	O
written	O
in	O
PL/M	B-Language
.	O
</s>
<s>
The	O
original	O
PL/M	B-Language
compiler	B-Language
targeted	O
the	O
Intel	B-General_Concept
8008	I-General_Concept
.	O
</s>
<s>
An	O
updated	O
version	O
(	O
PL/M	B-Language
-80	I-Language
)	O
generated	O
code	O
for	O
the	O
8080	B-General_Concept
processor	O
,	O
which	O
would	O
also	O
run	O
on	O
the	O
newer	O
Intel	B-General_Concept
8085	I-General_Concept
as	O
well	O
as	O
on	O
the	O
Zilog	B-General_Concept
Z80	I-General_Concept
family	O
(	O
as	O
it	O
is	O
backward-compatible	B-General_Concept
with	O
the	O
8080	B-General_Concept
)	O
.	O
</s>
<s>
Later	O
followed	O
compilers	B-Language
for	O
the	O
Intel	B-Device
8048	I-Device
and	O
Intel	O
8051-microcontroller	O
family	O
(	O
PL/M	B-Language
-51	I-Language
)	O
as	O
well	O
as	O
for	O
the	O
8086	B-General_Concept
(	O
8088	O
)	O
(	O
PL/M	B-Language
-86	I-Language
)	O
,	O
80186	B-Device
(	O
80188	O
)	O
and	O
subsequent	O
8086-based	O
processors	O
,	O
including	O
the	O
advanced	O
80286	B-General_Concept
and	O
the	O
32-bit	O
80386	B-General_Concept
.	O
</s>
<s>
There	O
were	O
also	O
PL/M	B-Language
compilers	B-Language
developed	O
for	O
later	O
microcontrollers	O
,	O
such	O
as	O
the	O
Intel	B-Device
8061	I-Device
and	O
8096	B-Device
/	O
MCS-96	B-Device
architecture	O
family	O
(	O
PL/M	B-Language
-96	I-Language
)	O
.	O
</s>
<s>
While	O
some	O
PL/M	B-Language
compilers	B-Language
were	O
"	O
native	O
"	O
,	O
meaning	O
that	O
they	O
ran	O
on	O
systems	O
using	O
that	O
same	O
microprocessor	O
,	O
e.g.	O
</s>
<s>
for	O
the	O
Intel	B-Operating_System
ISIS	I-Operating_System
operating	O
system	O
,	O
there	O
were	O
also	O
cross	B-Application
compilers	I-Application
,	O
for	O
instance	O
PLMX	O
,	O
which	O
ran	O
on	O
other	O
operating	O
environments	O
such	O
as	O
Digital	B-Application
Research	I-Application
CP/M	I-Application
,	O
Microsoft	O
's	O
DOS	B-Device
,	O
and	O
Digital	O
Equipment	O
Corporation	O
's	O
VAX/VMS	B-Operating_System
.	O
</s>
<s>
PL/M	B-Language
is	O
no	O
longer	O
supported	O
by	O
Intel	O
,	O
but	O
aftermarket	O
tools	O
like	O
PL/M	B-Language
-to-C	O
source-code	B-Language
translators	I-Language
exist	O
.	O
</s>
