I had the joy of using the XT/370. It was extremely cool to see the "mainframe" run in a box. But it was dog slow compared to a single user session on the mai

I had the joy of using the XT/370. It was extremely cool to see the "mainframe" run in a box. But it was dog slow compared to a single user session on the mainframe (which IIRC was a 4341). The 360/370 is/was an incredible architecture. It supported virtualization decades before anyone outside a small group of people even knew what that was. The instruction set was rich and easy to use which was important as a lot of stuff got written in it directly those days. Unlike Unix which was mostly written in C most of the 370 OSes of the time were written in assembly.