One guy discusses the XVR-1000 a bit: http://www.michaelfrankdeering.com/Projects/HardWare/FFB3/FFB3.html
but mostly the history, rather than anything specific enough to work with. There's also the page http://wikis.sun.com/display/FOSSdocs/Home where one can request docs on legacy hardware; I'd done that a few months ago, but it obviously can take quite awhile before someone has time to look at it. This message posted from opensolaris.org
