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If you mean conceptually then not much has changed since Von Neumann and Turing. Plenty of interesting topics just from those two.

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Yeah, but that's pretty abstract. I think one could give a more concrete discussion about how a computer does what it does at the very base level, too, hitting on such topics as: what are transistors, what do they do and how do they work, how does memory work, etc.

I like the direction this thread is going, these are responses along the line I was looking for. And yes, I'm not averse to more discussion of philosophy provided the topics discussed are somewhat more diverse.