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I am Stefan – system administrator in Bank computer centre with ZOS.

I can also make people happy by explaining little known tips and tricks from the realm of mainframe systems!

When the first computers were developed, I was there. I designed and worked on some of the first computers which hardly could fit in a room. It was back in the early 80s. That’s when my son was borne.

After a while, a little bit smaller calculating machines were developed. And we called them “mainframes”.

The idea was really simple. Big computing machine with the best possible computing power at the time, supporting big quantity of terminals. The only thing needed was a decent operating system and IBM’s ZOS happened to be the one…

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