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Re:IBM Launches New Mainframe with Focus on Security and Hyb... by vyrotek on Tuesday February 16, 2016 @06:23PM (#11113931)
Someone asked a similar question a few years ago and there was a good discussion on HN about it here.

https://news.ycombinator.com/item?id=4446880

My father's entire career revolved around IBM's TPF mainframe systems. Airline Reservation Systems, Credit Card Processing, and the IRS use it for extremely high volume processing.

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