It may be most, but it's definitely not all of them, even if you restrict yourself to DEC options. In addition to the DEC VMEbus adapter I mentioned in another message, there was also an A.Open (I think that's the name; the mutilation of I2C DEC used for keyboards and mice on the 5000/25) adapter. I know DEC did some serial ports, although I don't think they sold them; when I asked for info on doing serial port drivers for Ultrix, they dredged up code for a TURBOchannel serial interface from the bowels of some Ultrix lab. There was also some audio interface they used as an example implemenation in some paper somewhere.