Well how do you like that? An old Sega SC-3000H from 1983 has been given new life as a fancy keyboard PC. An enterprising modder named Cuzza over in the TechPowerUp forums laid out $4 for the old-timey computer, rolled up his sleeves, and got to work.
The updated internal components include a VIA Nano-ITX board with 1.5GHz CPU, 1GB of RAM, 80GB hard drive, and a slot loading DVD/CDRW drive from an old iBook. Cuzza got the actual keyboard on the Sega PC to work, too.
All told, the project spanned at least a couple months. This recently-uploaded YouTube video details the ins and outs rather thoroughly: