There were two versions of Futurebus. The original version dated from the early 1980s and was described in the IEEE 896 standard. It used standard 9Ux280mm euroboards and three 96 pin DIN connectors. Tektronix used this in their 3000? series workstations. The second version, Futurebus+, used improved backplane connectors and hard metric packaging. This is the version that DEC included in two different VAXen. Futurebus+ was a great intellectual exercise but was a market failure. Lots of Futurebus+ technology has made it's way into otehr products. Michael Thompson E-Mail: M_Thompson(a)IDS.net