<s>
The	O
history	B-Protocol
of	I-Protocol
software	I-Protocol
configuration	I-Protocol
management	I-Protocol
(	O
SCM	O
)	O
in	O
computing	O
can	O
be	O
traced	O
back	O
as	O
early	O
as	O
the	O
1950s	O
,	O
when	O
CM	O
(	O
for	O
Configuration	B-General_Concept
Management	I-General_Concept
)	O
,	O
originally	O
for	O
hardware	O
development	O
and	O
production	O
control	O
,	O
was	O
being	O
applied	O
to	O
software	O
development	O
.	O
</s>
<s>
The	O
first	O
software	O
configuration	B-General_Concept
management	I-General_Concept
was	O
most	O
likely	O
done	O
manually	O
.	O
</s>
<s>
Early	O
1970s	O
:	O
Unix	B-Application
make	B-Application
.	O
</s>
<s>
Circa	O
1972	O
:	O
Bell	O
Labs	O
paper	O
describing	O
the	O
original	O
diff	B-Application
algorithm	O
.	O
</s>
<s>
1972	O
,	O
with	O
an	O
IEEE	O
paper	O
in	O
1975	O
:	O
source	B-Device
code	I-Device
control	I-Device
system	I-Device
,	O
SCCS	B-Device
,	O
Marc	O
Rochkind	O
Bell	O
Labs	O
.	O
</s>
<s>
Originally	O
programmed	O
in	O
SNOBOL	B-Application
for	O
OS/360	B-Application
;	O
subsequently	O
rewritten	O
in	O
C	B-Language
for	O
Unix	B-Application
(	O
used	O
diff	B-Application
for	O
comparing	O
files	O
)	O
.	O
</s>
<s>
1970s	O
:	O
Lisle	O
,	O
Illinois-based	O
Pansophic	O
Systems	O
offered	O
PANVALET	O
,	O
which	O
was	O
an	O
early	O
source	B-Device
code	I-Device
control	I-Device
system	I-Device
for	O
the	O
mainframe	O
market	O
.	O
</s>
<s>
Revision	B-Architecture
Control	I-Architecture
System	I-Architecture
(	O
RCS	B-Architecture
,	O
Walter	O
Tichy	O
)	O
.	O
</s>
<s>
Early	O
1980s	O
:	O
patch	B-Application
(	O
around	O
1985	O
,	O
Larry	O
Wall	O
)	O
.	O
</s>
<s>
1986	O
:	O
Concurrent	B-Application
Version	I-Application
System	I-Application
(	O
CVS	B-Application
)	O
.	O
</s>
<s>
2000	O
:	O
Subversion	B-Application
initiated	O
by	O
CollabNet	O
.	O
</s>
<s>
Early	O
2000s	O
(	O
decade	O
)	O
:	O
distributed	B-Protocol
revision	I-Protocol
control	I-Protocol
systems	I-Protocol
like	O
BitKeeper	O
and	O
GNU	B-Operating_System
arch	O
become	O
viable	O
.	O
</s>
