To actually interact with the system once it's running, you will also need:
Hercules z/OS is a Hercules emulator that allows users to run z/OS, z/VM, z/VSE, and other mainframe operating systems on a PC. The emulator mimics the behavior of a real IBM mainframe, enabling users to run mainframe applications, test and develop software, and even learn about mainframe computing. hercules z os 21 download link
: You will need a 3270 terminal emulator, such as x3270. To actually interact with the system once it's
A grin spread across his face, half‑smile, half‑challenge. “Then we’ll have to think like code.” enabling users to run mainframe applications