We've verified that another machine besides the Atari XEGS works with the Liber809. Slor (pseudonym), a guy from the Atari group, purchased one of the Liber809 prototypes and has installed it in his Atari 1200XL. We spent some time last night going over test code with DriveWire 4 Server. Here's a screen shot of it in the 1200XL:
I've got some tidying up to do on the Liber809 ROM for the Atari, but expect to get all of the bugs worked out. We're not sure on the final design of the Liber809 board yet, but Gary's working on it, so we'll have an update soon.