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Speaking of earlier concepts of The Matrix, there's an old 1973 German movie/mini series World on a Wire that's really good.
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Other way around - the machines were using human brains as a substrate for computing.

If they can get Doom to run on a pregnancy test surely they could get it running on human brain cells?

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Wasn't the matrix using humans as some sort of power source/batteries? I may be misremembering though, as that seems pretty silly in retrospect ..
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Yes, but as I’ve read it that was to simplify it at studio demand for 1999 audiences. The original conception was to use human minds as coprocessors
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That sure would have made a lot more sense, unfortunate that they went with the battery story in the end.
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