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Re:The Hercules System/370, ESA/390, and Z/Architecture Emul... by curmudgeon9 on Thursday November 23, 2017 @08:10PM (#15768872)
IBM already has an official Z emulator they could offer for free non-commercial use, if they wanted:

https://www.ibm.com/us-en/marketplace/z-systems-development-...

Re:The Hercules System/370, ESA/390, and Z/Architecture Emul... by tiernano on Thursday November 23, 2017 @08:28PM (#15768916)
Starting at $4,780.00 USD* per year

Ouch!