This is an interesting overview of mainframe vendors and how many customers they might have: https://arcanesciences.com/os2200/app1.html https://arcanesciences.

This is an interesting overview of mainframe vendors and how many customers they might have: https://arcanesciences.com/os2200/app1.html https://arcanesciences.com/os2200/app1.html Most of the "dwarves" are now using emulation...