What Operating systems Mainframes run?

I was asked this question last week while I was riding with Scoop ride sharing service.[BTW scoop is great service. If you want to try it out then use my referral code HEMANTH9AF. We both get $20 credit]  We introduced each other and conversation goes like this:

Driver:  what technology you work on?
Me: Mainframes.
Driver:  what? mainframes? Are those still alive?
Me:  Yeah they are still going strong and runs top industries critical data
Driver: What kind of operating system mainframes run?
Me: Mainly z/OS
Driver:  Hmmm

That discussion promoted this post. We will look at various Operating systems that run on Mainframes

More details, check IBM knowledge center.

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