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Path: utzoo!mnetor!seismo!rutgers!cbmvax!andy
From: andy@cbmvax.cbm.UUCP (Andy Finkel)
Newsgroups: comp.sys.amiga
Subject: Re: re DMA hard disks
Message-ID: <1048@cbmvax.cbmvax.cbm.UUCP>
Date: Wed, 3-Dec-86 11:44:43 EST
Article-I.D.: cbmvax.1048
Posted: Wed Dec  3 11:44:43 1986
Date-Received: Thu, 4-Dec-86 09:04:01 EST
References: <2135@well.UUCP>
Reply-To: andy@cbmvax.UUCP (Andy Finkel)
Organization: Commodore Technology, West Chester, PA
Lines: 44

In article <2135@well.UUCP> spencer@well.UUCP (Randal Spencer) writes:
>Really, is that true?  If you get a hard disk that is DMA it has a DMA chip in
>it that is completely seperate from the Amiga DMA circuitry? 
Yes, its true.
 So that must be
>how the PC hard disks can be said to be DMA also.  So what does that mean for
>the lowly 3.5" floppies?  They don't have their own DMA circuitry so do they
>DMA only to chip memory and not to fast memory?  
This is also true.  The trackdisk.device (which talks to the floppies)
user the blitter.
Is it definate that when 
>an advertiser says that their hard disk is DMA then they mean that they have 
>one of those full memory DMA's and are not just using the Amiga DMA to Chip
>memory?  
I'd call and ask, personally.  Byte-By-Byte's has a DMA chip.

How does the sidecar do it? or is the side car just going to be slow?
voodoo.
>Is the sidecar going to have 2 meg of sockets for Amiga memory and sockets to
>bring the IBM memory up to 640K and an 8087 co-processor socket and is it going
>to reach the market?
The answe to that last question is yes, it is going to reach the
market.  It is already available in Germany, I'm told.
>
>You know, in psychology (my sisters graduate degree) they say that the most
>boring way to make conversation is to just keep asking questions.  So I thought
>I would provide this last piece of information to spice up this letter.
>
>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>Randy Spencer P.O. Box 4542 Berkeley CA 94704 (415)284-4740 ...well!spencer

				andy finkel
-- 

			andy finkel
			Commodore/Amiga
			{ihnp4|seismo|allegra}!cbmvax!andy
		or	 pyramid!amiga!andy

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"Never make anything simple and efficient when it can be complex and wonderful."