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80386 Microcode Disassembled

https://www.reenigne.org/blog/80386-microcode-disassembled/
35•nand2mario•48m ago

Comments

mettamage•28m ago
For me, this is peak Hacker News. I am happy I took the hard courses at uni to understand a post like this. I’m also happy that HN was there to stimulate this thinking at the time (2015). Even if I now don’t really do anything with my humble knowledge of low level programming, every time it feels consciousnesses enriching. And it’s an awesome feeling.

For people that don’t have access to a uni, I recommend nand2tetris.org

morphle•17m ago
Just building your own microprocessor from gates is an easier way to learn about designing microcode and understanding how processors work(ed). But it can't hurt to study a few simple old designs like RISC or Transputer. The 80386 is on the other side of that spectrum, needlessly complicated because they wanted to be backwards compatible with an old bad design.

There certainly is no need to go to university to learn chip design. Watching a few Alan Kay talks [3] or browsing Bitsavers computer designs [4] are good starting points.

We made an easier way (than FPGA) to simulate and convert your gate level design into transistors on a chip (for less than $200 in 2026). We call it Morphle Logic. Eventually you grow into making the largest fastest and cheapest supercomputer wafer scale integration [2].

[1] https://github.com/fiberhood/MorphleLogic/blob/main/README_M...

[2]https://www.youtube.com/watch?v=vbqKClBwFwI

[3] https://www.youtube.com/watch?v=f1605Zmwek8

[4] http://bitsavers.informatik.uni-stuttgart.de/pdf/xerox/alto/...

bmenrigh•20m ago
The black box analysis needed to decode this is incredibly hard but also incredibly fun and rewarding to pull off. Very impressive work.

I Miss Terry Pratchett

https://www.mahl.me/blog/the-spell-that-wouldnt-leave/
32•gorgmah•24m ago•7 comments

80386 Microcode Disassembled

https://www.reenigne.org/blog/80386-microcode-disassembled/
41•nand2mario•48m ago•3 comments

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https://www.anthropic.com/research/glasswing-initial-update
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185•colinprince•14h ago•107 comments

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225•speckx•20h ago•51 comments

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142•Michelangelo11•5h ago•40 comments

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https://devblogs.microsoft.com/oldnewthing/20260519-00/?p=112339
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https://www.cringely.com/2026/05/21/im-writing-again/
156•dan_hawkins•22h ago•40 comments