XRoar is a Dragon and Tandy CoCo emulator.

Changes:

* More WD279x commands implemented.
* Fixed 16-byte video mode rendering.
* Fixed Delta drive select bug.
* Better compatibility with old snapshots.
* Performance improvements in OpenGL driver.
* Writes supported to DMK format disk images.

http://www.6809.org.uk/dragon/xroar.shtml