For BETTER support see M5 branch supporting CoreFireIoT,CoreS2,CoreS3 which have extra RAM for D64 and C128 support. Also see master branch for list of supported platforms.
This is a static snapshot of the m5 project supporting an Atom S3 without SD/D64/C128 support, features include rendering full color screen on LCD.
Open browser-keyscan-helper/index.html to run an adapter with instructions how to use a keyboard via serial from a desktop web browser (e.g. Chrome).