diy 486 schematics (around year 2000)[0]. no longer available. Discription/overview[3]. :( But, current linux doesn't support 486 cpus.

Was turned into something commerical (?2002[2])[1]. Perhaps modern version would be the old AMD cyrix chips?

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[0] : http://boole.stanford.edu/cebit/

[1] : https://megagames.com/news/matchbox-pc-smallest-world

[2] : https://ptacts.uspto.gov/ptacts/public-informations/petition...

[3] : https://www.paloaltoonline.com/morgue/monthly/1999_May_26.MI...