Reverse-engineering the Z-80: the silicon for two interesting gates explained

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I've been reverse-engineering the Z-80 processor, using images from the Visual 6502 team. One interesting thing about the Z-80's s...
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9 Hacker News comments I'm tired of seeing

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As a long-time reader of Hacker News, I keep seeing some comments they don't really contribute to the conversation. Since the discussio...
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Reverse-engineering the 8085's decimal adjust circuitry

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In this post I reverse-engineer and describe the simple decimal adjust circuit in the 8085 microprocessor. Binary-coded decimal arithmetic ...
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Reverse-engineering and simulating Sinclair's amazing 1974 calculator with half the ROM of the HP-35

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I've reverse-engineered the Sinclair Scientific calculator. The remarkable thing about this calculator is they took a simple 4-function ...
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I wouldn't have given a nickel for their stock: Visiting Apple in 1976

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A guest posting from William Fine: I saw the "Jobs" movie yesterday and it revived some ancient memories of my dealings with Jobs...

Simulating a TI calculator with crazy 11-bit opcodes

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I've built a register-level simulator of a 1974 TI calculator chip that shows what actually happens inside a calculator when you perform...
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Reverse-engineering the 8085's ALU and its hidden registers

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This article describes how the ALU of the 8085 microprocessor works and how it interacts with the rest of the chip, based on reverse-engine...
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