This is a long report detailing the acquisition, setup, and context of running IBM z/OS 2.1 on the Hercules emulator.
083F 3390 D:\Hercules\zos21\SYS1.RES 083E 3390 D:\Hercules\zos21\SYS2.RES 083D 3390 D:\Hercules\zos21\SYS3.RES ... etc ... hercules z os 21 download link