Here's the first page I came across with some appropriate pictures: http://www.appelt4u.de/vax/vax4000-500/g-vax4000-500.htm IIRC, the far right is the PSU, the wide panel to the left of that covers the CPU + memory cage and the rest of the cage extending to the left is Q-bus. There are disk/tape bays above. Built-in DSSI gives these beasts in-built clustering capabilities. The VAX 4000-705A was just about the top of the VAX 4000 range. Given the appropriate CPUs and memories you could run anything from a VAX 4000-300 upwards in those boxes. Size-wise they are just about waist high and will need two people to lift comfortably. They roll aroun quite easily on their castors though. You can remove the skins and rack mount them in standard 19" racks - no extra rails required. At one stage I had two such VAXes mounted back to back in a rack clustered together. Quite a compact system for its day! Plenty of docs on Manx (http://vt100.net/manx). Look for "VAX 4000" and KA694, KA692, KA690, KA680 and KA670 (from latest to earliest). You can ignore anything in the VAX 4000-100 range, they are completely different beasts. The VAX 4000-200 is also a completely different animal but lives in a similar size enclosure. One final point is that the first member of the familt, the VAX 4000-300, originally shipped with a backplane that cannot support the later members of the family. So if you do come across a VAX 4000-300 enclosure you might not be able to swap parts freely with the -400/500/600/70x. Antonio -- Antonio carlini arcarlini at iee.org