Notes on the Pentium's Microcode Circuitry
by hubie from SoylentNews on (#6WD8P)
owl writes:
https://www.righto.com/2025/03/pentium-microcde-rom-circuitry.html
Most people think of machine instructions as the fundamental steps that a computer performs. However, many processors have another layer of software underneath: microcode. With microcode, instead of building the processor's control circuitry from complex logic gates, the control logic is implemented with code known as microcode, stored in the microcode ROM. To execute a machine instruction, the computer internally executes several simpler micro-instructions, specified by the microcode. In this post, I examine the microcode ROM in the original Pentium, looking at the low-level circuitry.
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