Scary maths

[lproven]

So I've been following up an idea of mine concerning "lost arts" in computer design, and as a result I've been reading up on a few largely-forgotten types of personal computer. (For a fairly generous definition of "personal computer". It was a digital computer, screen, keyboard etc., and you sat and worked at it.)

But one of my sources had some terms in it I didn't recognise. So I looked them up. And then I looked up the words I didn't know in the definition, and the next thing I know, I'm confronted with this.

And then my head did the 'splodey thing again.

Special prize for anyone who works out what specific kind of computer I was reading up on.