I recently discovered Christopher Barnatt's YouTube channel, ExplainingComputers, and I highly recommend it. Barnatt is the author of 13 books about computers and has taught for 25 years at the University of Nottingham. He explains digital technology very clearly, and many of his videos contain tests and demonstrations. In his latest video, he presents the evolution of computer motherboards since 1990, starting with the Intel 386 that ran at 20Mhz (no fan or heat sink needed!). It's amazing to see how things have changed in a few decades.
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