Computer Systems Research Group

Simplified evolution of Unix systems. The 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 organization at the University of California, Berkeley, dedicated to enhancing the AT&T Unix. Funded primarily by the DARPA. The CSRG focused on developing portable, high-performance Unix variants for academic and research environments, producing the Berkeley Software Distribution series.