Dan Sanderson reports that there is a C128 core for the Mega65 computer. Here is what he wrote:
Commodore 128 core for the MEGA65, by Stefan Eilers.
Meanwhile, Stefan Eilers has a Commodore 128 core in progress, with an early release for people to try. So far only 40-column mode and IEC disk drives are supported. It does not yet support cartridges, 80-column mode, or virtual disk images off the SD card. But there's meaningful progress, and you can play with it!
You will need C128 ROMs for this one as well. The 72 KB system ROM bundle is to be installed as: /c128/boot0.rom The 512 KB drive ROM is: /c128/boot1.rom Check out the Github repo for the project for more information.
https://github.com/eilers/c128Mega65
Truly,
Robert Bernardo
Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan