From: "Bob Armstrong" <bob at jfcl.com> As I remember, the RM02/3/5 were CDC 9760-something drives, which were SMD. Of course it's possible that the DEC OEM versions had customized interfaces. Yes, DEC made a bunch of gratuitous changes, although it might be possible to duplicate them with another drive. IIRC they reversed the polarity of most/all of the signals on one cable (it's differential so you can fix that by swapping wires), and the direction of the unit-select lines is reversed (so the plug in the drive tells the RM adapter what Massbus unit to be, rather than telling the drive what SMD unit to be). I think there are a few other things but the basic I/O interface is the same. My 11/730 has a UDA50 + RA81 instead of the RB730, and was bootable last time it was anything-able, FWIW. So I'd think a CDU720/etc. would work fine too. John Wilson D Bit