Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Undocumented 8086 instructions, explained by the microcode

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What happens if you give the Intel 8086 processor an instruction that doesn't exist? A modern microprocessor (80186 and later) will g...
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Reverse-engineering the 8086 processor's address and data pin circuits

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The Intel 8086 microprocessor (1978) started the x86 architecture that continues to this day. In this blog post, I'm focusing on a sma...
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