The links to the info referenced there are to the two sites I previously mentioned were inaccessible. I think I've found what I'm after though on http://www.nextgenos.co.uk/Atawhitepapers.htm Thanks for the link though Taavi - there's lots more good info there! Cheers! Jon On Thu, 23 Aug 2001, Taavi Burns wrote: > http://www.techfest.com/hardware/bus.htm