Ken Shirriff's blog

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

Reverse-engineering the multiplication algorithm in the Intel 8086 processor

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While programmers today take multiplication for granted, most microprocessors in the 1970s could only add and subtract — multiplication r...
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Reverse-engineering the register codes for the 8086 processor's microcode

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Like most processors, the Intel 8086 (1978) provides registers that are faster than main memory. As well as the registers that are visibl...
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