Q-bus to CF [was: IOmega]

For commercial you have to deal with the holder of the MSCP intellectual rights. The other issue is MSCP is an intelligent system that has DMA and is able to run linked lists for queued IO.The pro for MSCP is most all of the DEC OSs had drivers for it. The minus is complex, firmware intensive, DMA and temporary bus master and it would try to do some of the buffering that IDE drives already do well. Simple IDE/CF to Qbus(Ubus)... design is near complete copy of a bdirectional parallel port described in the Small Computer Interfacing Manual with a bit more to look like IDE bus and isolate reads and writes. Minus here is the IO is slower using PIO (but still faster than RX02), a driver is required for most OSs. The plus is simple to construct, the driver needed is very simple, if CF is used the board and a 32MB CF is a complete package with as much space as many small Qbus 11s ever had! I'd suggest to anyone that does this a basic boot rom on the board is a sane thing. For RT11, the DD (tu58) driver would make a good prtotype as would the HX previously mentioned. The RT-11 docs cover creating new drivers and VMS docs too. NO, I don't volenteer, way too much going on right now. Allison First you must have core or ram that looks like core (doesn't lose data on power fail). The assumption for real PDP-8 is always core and program in core.