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Unix was originally created on a PDP-7, and later ported to an 11/20.

Neither is substantially larger than a rack-mount PC.

Here's a tale about bringing Unix V0 up on a recovered PDP-7 at the Living Computers Museum + Lab[0]. They logged in as 'dmr'.

That looks substantially larger than a rack-mount PC.

You are right, my inflationist memory transformed the 7 into a 11 !