I'm investigating some SMS (Scientific Micro Systems) dual 8" floppy units that were built for PDP- and LSI-11 systems. They are model number FWT0100 and, similar to an RX02, have a "formatter" board inside the box with the floppy drives. Then there is a 40-pin ribbon cable that goes to a host controller in the PDP or LSI which can be either a Unibus or a QBus interface. I am wondering if anyone knows if the box+formatter is electrically and protocol compatible with the real RX02... such that you could connect the box to an RX11 or RX211 controller if you do not have the actual SMS host adapter? The documentation for the OEM version of the SMS box (which is out on Bitsavers) talks about the unit being interface and protocol compatible with the RX02 but it is not clear if they are talking about the complete system including their controller in the host or if they are meaning that the interface to the formatter is compatible. The thing has two modes... normal and enhanced and in enhanced mode, there are extra capabilities that the RX02 can not do and I fully expect that you need the SMS controller to operate in that mode... but the normal mode is still a question. I have an RX211 and no real RX02 drives and I now also have one of these SMS boxes so I'm trying to do a little investigation of their compatibility before I just plug them together and see what happens. The RX211 end is pretty well documented. The SMS end... with details of the formatter board... not so much. There is also a FWT1100 version of the SMS box which has a single 8" floppy and an 8" Winchester in it. These work with the same SMS host controller but then for sure run in enhanced mode in order to support the Winchester capabilities. Does anyone have more info or experience with the SMS dual 8" floppy boxes? Chris -- Chris Elmquist