Ken Shirriff's blog

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

Two interesting XOR circuits inside the Intel 386 processor

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Intel's 386 processor (1985) was an important advance in the x86 architecture, not only moving to a 32-bit processor but also switching ...
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Reverse engineering the barrel shifter circuit on the Intel 386 processor die

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The Intel 386 processor (1985) was a large step from the 286 processor, moving x86 to a 32-bit architecture. The 386 also dramatically impro...
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Inside the Intel 386 processor die: the clock circuit

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Processors are driven by a clock, which controls the timing of each step inside the chip. In this blog post, I'll examine the clock-gene...
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