I might have a DHV11 manual around, I'll have to check. I do have a board in an old uVAX II. Do you need anything in particular? Like the CSR and interrupt switch settings? As I recall, the Q-bus DHV isn't quite the same as a the Unibus DH11, but it does use DMA, much faster than a DZQ11. The DHV11 uses floating CSRs, do you know how to set them? (I assume you are going to use VMS) Jack Peacock