I added Disk Copy 4.2 image support about a week ago, but it was buried in a footnote of another post. DC4.2 images are mounted as read-only, since the image is checksummed, and I'm not prepared to recompute the checksum on the fly.

I've ordered parts to build some more Floppy Emus, with a new v1.1 board that adds a couple of extra features. Hopefully I'll have some ready in a few weeks!