This article brings back some happy memories! Well done Marianne. z/OS, TSO, JCL and the rest are different to what most people are used to but this is where m

This article brings back some happy memories! Well done Marianne. z/OS, TSO, JCL and the rest are different to what most people are used to but this is where modern IT started, where virtualisation, high availability and serious backward compatibility were invented. Peel away the layers of technology is a large company and you will often find a mainframe managing the core data of the business.