May 23, 2026
Silicon secrets, comment-section chaos
80386 Microcode Disassembled
Internet geeks lose it as a 30-year-old chip finally gives up its secrets
TLDR: Researchers decoded the hidden inner instructions of Intel’s 80386 chip from high-resolution photos, a major win for computer history sleuths. The community reaction was a mix of worship, curiosity, and amused confusion, with many calling it elite nerd content and others begging for a simpler explanation.
A dusty old computer chip from the early 1990s just became the star of a very online detective story. On his blog, reenigne revealed that he and collaborators managed to pull apart the hidden instruction layer inside Intel’s 80386 chip using die photos, image processing, automation, and a lot of stubborn brilliance. In plain English: they looked at microscope-style pictures of the chip and slowly figured out the secret internal playbook that tells it how to work. For hardware history fans, this is basically forbidden archaeology.
And the comments? Pure adoration, awe, and a little bit of nerdy existential crisis. One fan called it “peak Hacker News,” saying this kind of post makes all those brutal university classes feel worth it. Another summed up the mood more simply: this kind of black-box decoding is “incredibly hard but also incredibly fun,” which is basically the community’s love language. The funniest mini-drama came from the confused-but-curious crowd asking, "Wait, how do you get secret code from a photo of a chip?" That launched the classic comment-thread ritual: half the room flexing, half begging for an explain-like-I’m-five version.
There was also some wholesome side chatter about reenigne’s blog apparently springing back to life after years of quiet, plus a commenter casually dropping a free-book recommendation like the thread’s resident professor. So yes, the technical feat is huge — but the real show is the comment section turning ancient silicon into a blockbuster nerd reunion.
Key Points
- •The author received a high-resolution image of the Intel 80386 microcode ROM from Ken Shirriff after earlier 8086 microcode work.
- •The 80386 ROM was much larger than the 8086 ROM, at 94,720 bits versus 10,752 bits, and initially lacked a clear roadmap for analysis.
- •Collaborators later extracted the ROM contents from die imagery using image processing, AI, and human-aided automation, then cross-checked the binary output.
- •The disassembly process involved identifying μ-op layout, ordering, and field meanings, aided by die tracing and decoding of the instruction decoder and protection test PLA.
- •The article says the 80386 microcode has 215 entry points from the decoding ROM, compared with 60 for the 8086, and emphasizes that the 80386 relies more on dedicated hardware accelerators.