> > A list of I/O adresses should not be that much of a problem, DMA
> > transfers are another story. Anyway, if you are interested, i'll
> > prepare a list from the NetBSD sources.
> The DECstations don't use DMA, IIRC ... the SCSI and Ethernet controller
> have their own little buffer RAM areas, the R3000 is responsible for all
> memory transfers ...
Michael, i'm afraid that is not fully correct. AFAIK all Turbochannel
DECstations except the 5000/200 have an IO-ASIC on board which
supports DMA-Channels for the SCSI, Ethernet and even the serial
ports. These machines have no RAM buffers. But remember, this is
second if not third hand information, so take it with a grain of
> Michael Engel (email@example.com)