Z390 Portable Mainframe Assembler and Emulator

Описание: Run IBM mainframe Assembler programs (and more) on your desktop without a mainframe!

https://github.com/z390development/z390

If you click on the "Latest release" link on the github page above it will bring you to another page. At the bottom of that page is a zip file. If you download/extract that file you can run it just like I did in the video, You don't even need to install Java.