Poking about looking for comms references, came across this
multi-part tutorial on hardware

http://www.viking.delmar.edu/Courses/CIS415L/Lesson1.htm

Use the links to break out to expanded explanations and the
pull-down + Go at the bottom of the page to move on to the next
lesson

_______________________________
Even if you're on the right track, you'll get
run over if you just sit there.

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