NetBSD

NetBSD
NetBSD 1.2 booting up in SIMH
Architecture:	multiplatform
This Version:	NetBSD 5.0.2 (February 7, 2010)
Date Released:	1993

NetBSD is a bit of a blessing for many hobbyists, as it includes support for the VAX, Amiga, 68k Macs, various Sun systems like the Sun-3 as well as a wide variety of toasters and the HP300. You might want to check the entire list at the NetBSD list of ports. There's even some discussion of a port to PDP-10s!

NetBSD started out as a derivative of 386 BSD, as at the time it was a collection of patches to 386BSD. People grew dissatisfied with the lack of updates with 386BSD, and how the patchkit kept getting larger and larger & unwieldy leading to the various authors of the patches to start their own fork of 386BSD, called NetBSD as it was created on the 'internet'. NetBSD focuses on portability and simplicity of the code.

It's worth noting that a political fight within NetBSD led to the formation of OpenBSD.

Version 1.2

This version restored support for the VAX Platform. Installing NetBSD 1.2 on the SIMH MicroVAX II

Version 5.0.2

As of November 17 2010 this is the current version. The exiting change (well to me) was the inclusion of unit tests in the OS so that users of less used ports (VAX) can certify that their OS is performing as it should be...

Installing NetBSD 5.0.2 on the SIMH MicroVAX II

other

Running NetBSD on a VAX