Editing Computer Systems Research Group (section)

{{Short description|Former American research group at University of California, Berkeley}}
{{Redirect|CSRG|the defunct Chinese rolling stock manufacturer|China South Locomotive and Rolling Stock Industry (Group) Corporation|the World War I era machine gun|Chauchat}}
{{Use mdy dates|date=July 2020}}
[[File:Unix history-simple.svg|thumb|300px|Simplified evolution of [[Unix]] systems. The [[Mach (kernel)|Mach kernel]] was a fork from [[BSD]] 4.3 that led to [[NeXTSTEP]] / [[OpenStep]], upon which [[macOS]] and [[iOS]] are based.]]

The '''Computer Systems Research Group''' ('''CSRG''') was a research group at the [[University of California, Berkeley]], that was dedicated to enhancing [[Old AT&T|AT&T]] [[Unix]] [[operating system]] and funded by the [[Defense Advanced Research Projects Agency]].