This is simply a fun, spare time project to share some of my attempts to program on a IBM 370 Mainframe without the help of any Operating System.

All material on this website is presented “As Is” with no implied warranty or any guarantee of any kind.

Furthermore I acknowledge that I am not an expert in operating system design.  I have looked at a couple of books but never taken the time to read them.

My main goal is to have fun and share my experiences with anyone who is interested.

Finally, any code I write and publish on this site is available for use by anyone without any restrictions.  If you like what you see I would appreciate hearing from you.

Thanks – Tommy




  1. This page doesn’t have a working link to the page.
    Also, it’d easier for if this could all be in a PDF, I have learning issues…

    • David, I am not sure what you mean there is not a working link. I agree that a PDF would be nice but unfortunately, at least for now, I don’t have the available to time take on such a project. Maybe one day if/when things slow down for me it may be possible. Thanks for your input.

Leave a Reply

Your email address will not be published. Required fields are marked *