Someone sent me
this link...
http://davidguy.brinkster.net/computer/
It is an online scan of the book "How it works - the computer", circa 1971.
Eeek!... I remeber that book when it was current. As you've probably
gathered, the 'ladybird books' were aimed at children, and I think I had
all the 'How It Works' series.
Wow, that brings back some memories. Unfortunately I can't remember
which ones I had - and I doubt I hung onto them either :(