Actually its from one of their college level text books ........ That was just the very first page - it gets a bit more involved, I just couldn't be assed to scan any more pages - as you probably couldn't have been assed to read anymore of them.

But like I said hardware has never been my forte - its something I have recently been paying more heed to in my push to know everything

BTW that is a really good site you posted - I will be making good use of it over the next few weeks.