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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Four Rigol oscilloscope hacks with Python

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A Rigol oscilloscope has a USB output, allowing you to control it with a computer and and perform additional processing externally. I was i...
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Reverse-engineering the flag circuits in the 8085 processor

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Processors all have status flags to keep track of conditions such as a zero value, a carry, or a negative value. Whenever you write a loop o...
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