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Re:IBM ported Go to s390x mainframes by jhallenworld on Monday January 11, 2016 @12:19PM (#10881707)
You can try MVS, a z/OS precursor, for free:

http://www.bsp-gmbh.com/turnkey/

Re:IBM ported Go to s390x mainframes by krylon on Monday January 11, 2016 @01:22PM (#10882084)
It is nice for fun or digital archaeology, but the last freely available version of MVS was released ca. 1978... But it is nice to get a feeling of what the system is like.