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From: hamilton@uiucuxc.UUCP
Newsgroups: comp.sys.amiga
Subject: re: DMA hard disks
Message-ID: <172200006@uiucuxc>
Date: Wed, 26-Nov-86 11:50:00 EST
Article-I.D.: uiucuxc.172200006
Posted: Wed Nov 26 11:50:00 1986
Date-Received: Fri, 28-Nov-86 07:22:21 EST
References: <2118@well.UUCP>
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Nf-ID: #R:well.UUCP:2118:uiucuxc:172200006:000:1090
Nf-From: uiucuxc.CSO.UIUC.EDU!hamilton    Nov 26 10:50:00 1986


spencer@well says:
> So what does all this mean?  I am not thinking really hard about getting a
> DMA hard disk because as I understand it, if I want to load a program into
> fast memory I am not going to be able to do it using DMA anyway!  Is this
> not true?  Maybe it could be DMA'ed into the chip_memory, and then be
> moved by the CPU to fast_memory, without having to worry about the interrupts.
> Is this true?  

    no, you're thinking of the amiga custom chips' DMA channels, which
are limited to CHIP memory.  an outboard DMA channel would not be so
limited.  even without a disk drive, an outboard DMA channel might be
useful for FAST to CHIP (and vice versa) ram transfers.

> is the C-LTD board DMA?  Not at that price I would think not.

    why not?  how much does DMA add to the cost?  $50?

	wayne hamilton
	U of Il and US Army Corps of Engineers CERL
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