I don't know about Pentium, but there's definitely some homebrew 486 projects out there, e.g.: https://maniek86.xyz/projects/m8sbc_486.php https://maniek86.xyz

I don't know about Pentium, but there's definitely some homebrew 486 projects out there, e.g.: https://maniek86.xyz/projects/m8sbc_486.php https://maniek86.xyz/projects/m8sbc_486.php