Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!burkett
From: burkett@csd4.csd.uwm.edu (Edward W Burkett)
Newsgroups: comp.sys.ibm.pc
Subject: Re: backup programs, DMA speeds
Message-ID: <4048@csd4.csd.uwm.edu>
Date: 30 Aug 89 13:11:20 GMT
References: <8Yym5V200WB58jE1Az@andrew.cmu.edu>
Sender: news@csd4.csd.uwm.edu
Reply-To: burkett@csd4.csd.uwm.edu (Edward W Burkett)
Organization: Computing Services Division, UW Milwaukee
Lines: 32

In article <8Yym5V200WB58jE1Az@andrew.cmu.edu> mg32+@andrew.cmu.edu (Michael Ginsberg) writes:

>Just a note:  One reason why you'd want to turn off concurrent DMA (read:
>the hard drive is being read while the floppy writes) is that, while real
>IBM's and good clones have seven channels, all dependable, many clones have
>only one, or seven with only one really being proven in.
.
.
>Another thing, many people find that
>the dma works at a slower speed... I had an AT clone that did perfect backups
>at 8 mhz, but at 12 it failed miserably (of course never telling you that it
>was dying).  Many backup programs (such as FastBack Plus, but I don't really
>trust this program in general so...) will test your system for you, trying to
>make backups and restore at various DMA speeds, and it then recommends to you
>one of the speeds...

I have one of those clones (LE Model D) that have a bad DMA.  I have been using
FastBack Plus for sometime now and it seems to be a very reliable program.  
When I test the DMA, I find that I can only make backups at the slow speed :-(!
I would like to replace the defective chip but I need to know more about its
location.  Is the DMA chip part of the mother board, floppy disk controller or
harddisk controller.  I assume it is on the mother board.  Secondly, can it be
easily purchased and replace by the owner or would it have to be put in by a
repair technician?

Any help would be greatly appreciated.

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burkett@csd4.csd.uwm.edu (Edward W Burkett)
University of Wisconsin -- Milwaukee
Department of Biological Sciences
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