Z/OS is IBM's mainframe operating system.
This manages most of the infrastructure of our world.
![image](https://steemitimages.com/640x0/https://i.ytimg.com/vi/2ABfNrWs-ns/maxresdefault.jpg)
Just to give you an idea how inportant they are.
![image](https://steemitimages.com/640x0/https://3.bp.blogspot.com/-evGYOrp-M2I/Uzksfkm9VyI/AAAAAAAAAqc/DLGyo0m4LHo/s1600/mainframe50b.jpg)
They have been around since the mid 50's if you count R&D
![image](https://steemitimages.com/640x0/http://mainframeinsights.com/wp-content/uploads/2016/01/Mainframe-chart.jpg)
Bill O'farrell and his team talk about how they changed Z/Os forever.
Want to hack on one?
Check it out for 120 days:
https://developer.ibm.com/linuxone/