I know Orange Micro made some hardware that did that. Never really looked into it so I don't know if they still are around or what state that project is in.
Yep,
orange micro did make such a product but they discontinued it once I got my B&W G3 Those chips are in the Pentium stage now lol
They also included it's own RAM and so on... I am just talking about the chip.. no extra ram or graphics boards... well Chip + maybe parallel and a serial port for controllers