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What about from the 60s? Archaic?

Anything with non keyboard input = prehistoric.

Is it at all possible to get a peak into that world as a curious person?

Unisys not, but the one predating UNIX,

With Multics i'm familiar enough, i meant unisys specifically.

Not for free,

However you can get into the documentation for free,

NEWP manual, the systems language,

Overall documentation,

The original system back in 1960's,