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From: brian@sdcsvax.UUCP (Brian Kantor)
Newsgroups: net.micro.68k
Subject: DMA SCSI/SASI port
Message-ID: <1435@sdcsvax.UUCP>
Date: Thu, 20-Feb-86 10:02:47 EST
Article-I.D.: sdcsvax.1435
Posted: Thu Feb 20 10:02:47 1986
Date-Received: Mon, 24-Feb-86 05:31:52 EST
Organization: UCSD wombat breeding society
Lines: 22

Does anyone out there have a design or a pointer to an application note
for a DMA SCSI interface?  I am thinking of using a MC68440 Dual DMA
controller to implement one in a 68000 system for a radio system
communications interface and controller, but other dma chips or methods
would be of interest too.

Or is DMA worth doing?  I've always used interrupt-synchronized
processor byte i/o for SASI interfaces, but this application will have
LOTS of block i/o going on constantly on the SASI bus, so it might be
worth it.

First cut on the design uses a 68010 at 8 MHz, 68440 DDMA, 68230, 8530,
some miscellaneous i/o, 128K of PROM, and 1/2 to 1 meg of DRAM.  In
other words, sort of a vanilla controller.

	Brian Kantor	UCSD Office of Academic Computing
			Academic Network Operations Group  
			UCSD B-028, La Jolla, CA 92093 (619) 452-6865

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