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Record · corpus.blog/posts/01a0be04-6473-709b-b284-18ffb79d404a

Notes on the Pentium's microcode circuitry

Ken Shirriff Blog · published 31 March 2025

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pbx.sh
uCode part 0: PLA / Mask ROM tool Read at the source ↗
21 Aug 2026

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https://static.righto.com/images/pentium-microcode1/pentium-labeled.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/rom-output-lines.jpg
static.righto.com
https://www.righto.com/2022/11/how-8086-processors-microcode-engine.html
righto.com
https://static.righto.com/images/pentium-microcode1/rom-closeup.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/mosfet-n.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/rom-transistors.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/rom-schematic.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/m1-diagram.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/rom-m3.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/MAR.jpg
static.righto.com
Standard cells: Looking at individual gates in the Pentium processor Read at the source ↗
righto.com
https://doi.org/10.1109/40.216745
doi.org
https://static.righto.com/images/pentium-microcode1/row-driver-schematic.jpg
static.righto.com
https://static.righto.com/images/pentium-microcode1/output-mux.jpg
static.righto.com
Interesting BiCMOS circuits in the Pentium, reverse-engineered Read at the source ↗
righto.com
https://static.righto.com/images/pentium-microcode1/output-die.jpg
static.righto.com
Intel's $475 million error: the silicon behind the Pentium division bug Read at the source ↗
righto.com
https://doi.org/10.1109/MDT.1987.295165
doi.org
https://bsky.app/profile/righto.com
bsky.app
Pentium II Microcode: collected tweets part 1 Read at the source ↗
pbx.sh
https://static.righto.com/images/pentium-microcode1/output-mux-detail.jpg
static.righto.com