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Also the Quark X1000 SoCs --- they have an almost unmodified (there are a few Pentium/586-level instructions added) 486 core running at 400MHz. Compare the diagram on page 19 of this:

https://www.intel.com/content/dam/support/us/en/documents/pr...

...with this:

https://en.wikipedia.org/wiki/File:80486DX2_arch.svg

A lot of the text in the PDF above was copy-pasted from the 486 doc too.



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