Other freely available IBM operating systems available, OS/360, VM/370, OS/VS1

If any of the links provided here are broken I would suggest checking www.cbttape.org as it seems to keep up-to-date links to everything.

The public domain distribution media for OS/360, DOS/360 and TOS/360, VM/370 and TSS/370 as well as Turnkey3 MVS3.8J were available at http://www.ibiblio.org/jmaynard/ last time I checked if you want to try to run the older operating systems yourself.

I have sucessfully used the files and resources available to get VM/370 running with a minimal MVS3.8J system running under it (at least it IPL'ed and I could get a console and TSO session to it), plus a OS/360 system IPL'ed. But as I really didn't know what to do with them (beginning my career on S/370 later replaced by DOS/VSE so I missed OS/360) so I have so far stuck to mvs3.8j directly under hercules for now.

Additional notes for VM/370

There is a community supported edition of this now at http://vm370.org/vm. That should probably be your first point of call.
This seems to be a maintained bugfixed version of the origional old five pack system.

Only read on if the community edition does not meet your needs.

I covered obtaining and how to use the much older five pack system in the DOS/VS page. That has a few more details on how to actually start and use VM/370 for that specific OS.

Burried somewhere on this site is a reference to running MVS3.8J inder VM/370 that I think may use a six pack system.

There is also this video on running Amdahl UTS UNIX under VM/370 if you are interested in that.

Lots of tutorials on how to run things under VM/370. Some of those even have additional disk packs you need. If you are interesting in VM/370 using the community supported edition is probably your best bet.