From: utzoo!decvax!harpo!utah-cs!utah-gr!thomas Newsgroups: net.unix-wizards Title: Re: DZ-11 vs DH-11 Article-I.D.: utah-gr.557 Posted: Tue Sep 14 09:14:39 1982 Received: Wed Sep 15 04:23:22 1982 References: ittvax.437 Ken O's comments about DH inefficiencies on Vaxen do not apply to the 4.1bsd operating system. Why? Because the DH driver PERMANENTLY allocates a piece of Unibus map which points to the clist area. Thus, there is NO overhead of setting up the Unibus map for DH DMA output. There is still the normal overhead of setting up the DMA transfer, but this is small. =Spencer