Berkeley Software Distribution (BSD), also known as Berkeley Unix, is a Unix operating system derivative developed and distributed by the Computer Systems Research Group at the University of California, Berkeley from 1977 to 1995. Key events included the release of Version 1 in 1977, which added improvements to Pascal and vi. By the late 1980s, BSD code was freely distributed, leading to variants like FreeBSD, NetBSD, and OpenBSD that are still actively developed today. Many modern operating systems are based in part on BSD, including Apple's macOS, Juniper's JunOS, and components of Linux distributions.

1. BERKELEY UNIX

2. INTRODUCTION Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the UNIX oprating system derivative, developed and distributed by the Computer System Research Group (CSRG) , of the University of California, Berkeley, from 1977 to 1995.

3. BSD Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the UNIX operating system derivative developed and distributed by the Computer Systems Research Group (CSRG) of the University of California, Berkeley, from 1977 to 1995.

4. The History of BSD 1973 - Ken Thompson/Dennis Richie deliver a paper on UNIX

5. Dr. Bob Fabryfrom Berkeley attends and later obtains a copy of UNIX

6. UNIX is installed on several Berkeley PDP/11’s

7. Ken Thompson takes a sabbatical at Berkeley, install Version 6 on a PDP/11, and writes a Pascal compilerThe History of BSD1977 - Bill Joy puts together 1st Berkeley Software Distribution (Version 1)

8. mid-1978 - 2BSD released with improved Pascal, termcap, vi (about 75 shipped)

9. 1978 - Berkeley obtains a VAX-11/780

10. A copy of AT&T 32/V UNIX is installed - does not take advantage of virtual memoryThe History of BSD1979 - VAX/BSD distribution assembled includes:

11. virtual memory

12. std 32/V utilities

13. all BSD additions

14. Bill Joy ships about 100 tapes of3BSDThe History of BSDDARPA becomes interested in BSD

15. wants to have common platform (reduced porting costs on different/w and os’s)

16. desires distributed network

17. UNIX chosen to solidify DARPA userbase

18. 1980 - DARPA grants Berkeley 18 month contract to add DARPA contractors featuresThe History of BSD1983 - 4.2BSD is released

19. over 1000 shipped - Very popular

20. 1986 - 4.3BSD released w/ BSD TCP/IP stack

21. AT&T did not have networking/fast file system.

22. These were later incorporated into System V using BSD code (which turned out to be a good thing)

23. 1988 - 4.3BSD-Tahoe released (machine-independent)The History of BSDUp through the release of 4.3BSD-Tahoe, users were required to purchase an AT&T source license.

24. AT&T continued to increase the license cost.

25. PC vendors wanted the TCP/IP stack code, so this was split out.