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Die photo of the 74181 ALU chip. The metal layer of the die is visible; the silicon (forming transistors and resistors) is hidden behind it. Super Computer, Projects School, Science Park, Ok Computer, Quantum Computing, Reverse Engineering, Computer Chip, Vintage Technology, Strange Art

The 74181 ALU (arithmetic/logic unit) chip powered many of the minicomputers of the 1970s: it provided fast 4-bit arithmetic and logic functions, and could be combined to handle larger words, making it a key part of many CPUs. But if you look at the chip more closely, there are a few mysteries. It implements addition, subtraction, and the Boolean functions you'd expect, but why does it provide several bizarre functions such as "A plus (A and not B)"? And if you look at the circuit diagram…

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