[clausz]

How old is this? Copyright at the bottom of the page says "1990".

[gregschlom]

I think it's a cool little easter egg. Goes well with the technical illustration of a 3.5" floppy disk at the top and the pixelated font for the titles.

Also, maybe the author meant to say he started thinking about this book since 1990, too.

Either way the copyright year doesn't matter. You can put anything

[junon]

It's definitely not from 1990.

[rossant]

Probably the author himself is from 1990.