Before diving into installation steps, it is vital to address the most critical aspect of running z/OS:
While you cannot legally download z/OS freely, the
Running a mainframe OS on your PC requires some resources. Here are the recommended specifications for a good experience with Hercules and z/OS:
Before installing Hercules, you may need a few additional components on your system, depending on your operating system:
After configuration, you can launch Hercules.
# Configuration file for Hercules CPUSERIAL 000123 CPUMODEL 2827 # Simulates an IBM zEnterprise BC12 MAINSIZE 4096 # Virtual RAM in Megabytes ARCHMODE z/Arch # Enables 64-bit mode NUMCPU 2 # Number of emulated engines # CTC/Network Adapters 0E20-0E21 CTCI 192.168.1.100 192.168.1.200 # DASD (Direct Access Storage Devices / Hard Drives) 0A00 3390 ./dasd/sysres.3390 0A01 3390 ./dasd/user01.3390 # Consoles and Terminals 0009 3215 0010 3270 Use code with caution. Connecting to the Emulator
For the absolute latest features and fixes, the project's GitHub repository is the best place to find the most current source code.
While the z/OS operating system itself is proprietary, the software used to emulate the hardware——is completely free, open-source, and legal to download. Hercules emulates the IBM System/370, ESA/390, and z/Architecture hardware instructions.
If you are looking to explore this world legally, here is the "starter pack":
This report details the location of the emulator , the legal constraints of the operating system , and the technical specifications required to run z/OS 2.1.
"You don't download the link," a user named Sysplex_Ghost had written in a thread from 2024. "You inherit the ghost."
Once the console signals that the system is up, open your TN3270 emulator. Connect to localhost on port 3270 .
Hercules z/OS is a software emulator that mimics the behavior of a mainframe computer, allowing users to run z/OS operating system on a non-mainframe platform. Developed by the Hercules team, this emulator is designed to provide a compatible and efficient environment for running z/OS applications.