ke5shr and myself have been working on a fun project. We're using an old PC, Linux software, an older 2meter radio, and a custom serial to PTT circuit.
We researched this as a means of creating a concise guide for others to follow in order to get into digital modes.
WM2U provides some great materials on his website:
www.qsl.net/wm2u/interface.html
That's all for now, but there will be a full write up and article posted here on this site in the articles section to share our experiences with everyone about this.