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Two's complement and signed integers
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Using the Adder for Subtraction 
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---- VIDEO ------------------------------
https://www.youtube.com/embed/wJkuQ-SxHek
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Sorry, no slides ... just old fashioned handwriting ;-)

Multiplexer (and Demultiplexer)
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---- VIDEO ------------------------------
https://www.youtube.com/embed/Nqjllb--TU8
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Sorry, no slides ... just old fashioned handwriting ;-)

Two's Complement for Signed Integer
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---- VIDEO ------------------------------
https://www.youtube.com/embed/UZjZDI-lk4w
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Sorry, no slides ... just old fashioned handwriting ;-)