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From: pstevens@pioneer.arpa (Paul Stevens RCE Sterling)
Newsgroups: comp.sys.dec
Subject: microVAX memory
Message-ID: <2423@ames.arpa>
Date: Fri, 31-Jul-87 10:32:32 EDT
Article-I.D.: ames.2423
Posted: Fri Jul 31 10:32:32 1987
Date-Received: Sat, 1-Aug-87 21:48:33 EDT
Sender: usenet@ames.arpa
Reply-To: pstevens@pioneer.UUCP (Paul Stevens RCE Sterling)
Distribution: world
Organization: NASA Ames Research Center, Moffett Field, Calif.
Lines: 18
Keywords: memory, block mode DMA

I am in the process of putting together a microVAX II based data
acquisition system in which it is intended to use DRQ3B's in block
mode DMA.  In some of the DEC related periodicals I have seen 
indications that not all memory boards support block mode DMA.
This seems strange as I thought that block mode was function only
of the DMA controller and how that controller used the bus.  My
question is therefore twofold:

1) Is is true that not all memory boards support block mode?

2) What is it about a memory board that would preclude using
   block mode?

respond as you see fit: net,email,phone and thanks in advance

P. Stevens
(415)-694-4887
sorry I'm too new to the net world to suggest paths for email.