On Tue, Nov 24, 2015 at 3:13 AM, Johnny Billquist <bqt at update.uu.se> wrote: > The RH11 do DMA, just like all other disk controllers I know of. IIRC, the RX11/RX211 (Unibus) and RXV11/RXV21 (Qbus) don't do DMA.