MVS 3.8

System Documentation





I first became interested in the Hercules IBM Mainframe simulator / emulator for running Linux/390 on my PC.  As I was working to get Linux up and running I noticed the effort to get MVS working under Hercules.  Once MVS was up and running (and the hard work was done by someone else), I decided to try running it myself.  I was completely amazed!  Here was the same operating system I was running in the late 1970's on then a "Big" 370/158 with 4 Meg of memory.  I can still remember back to late night system maintenance, Saturday Evening SYSGENs, and TSO line editor mode.  Now if I just had a card punch.

Many thanks to everyone that has contributed to my fun running my own MVS on my own "mainframe."  For the first time in over 20 years I can finally do whatever I want with the operating system. 

In my effort to be a part and contribute to the MVS 3.8 efforts I have attempted to create some basic documentation that should be of help to others.

If you have any questions, comments, suggestions, or corrections, please send me a note at

Thanks, Tommy