Microsoft was selected as the vendor
os for IBM
DOS, which stands for Disk Operating System.
ibm
Oh, dude, like, Bill Gates didn't really talk anyone into letting him create their operating system. He and Paul Allen actually created their own operating system called MS-DOS, which they licensed to IBM. So, it's more like they were the cool kids creating their own thing and IBM wanted in on the action.
The original operating system for an IBM PC with Intel Processor was DOS (disk operating system) which operated at a command level prompt of C:
windows NT
hi
Microsoft
Win98
ibm
os/2
IBM System z servers are supported by a multitude of operating systems, such as z/OS, z/VSE, z/TPF, Linux on System z and the z/VM hypervisor.