Need Rec: Book to teach about computers and BASIC at an eight year old level

[Ali]

So somewhat OT - I've setup an 8 year old w/ an IBM PC XT w/ CGA. To say he
is less than impressed is understating things :). However, I am determined
that he will learn basic computer terminology, architecture, history (i.e.
how we got here) and at least get his feet wet with programming by learning
BASIC this summer.

Apparently teaching is not my strong suite - while I can talk about a larger
number of the above topics, especially at his level, organizing them in a
way to make sense is the problem. I was wondering if anyone could recommend
a good book that gets the basic stuff out of the way (what is the CPU,
memory, storage, etc. what are different the parts called, etc.) and maybe
another one that teaches an intro to BASIC written for a very young reader?
It would be nice if the book is in the PD or at least available as a PDF
that way he can read it on his Kindle. However, I am not averse to buying a
physical new (or used book) either. 

Thanks.

-Ali