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From: bobmon@iuvax.cs.indiana.edu (RAMontante)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: broken DMA
Summary: Not necessarily...
Keywords: DMA 80386
Message-ID: <1991Mar1.113741.19965@news.cs.indiana.edu>
Date: 1 Mar 91 16:37:31 GMT
References: <63023@bbn.BBN.COM>
Organization: 'twixt Dali and Dada
Lines: 15

grossman@bbn.com (Martin Grossman) <63023@bbn.BBN.COM> :
| 1) I just got a 80386DX 33MHZ
|    A: is 5.25 1.2MB
|    B: is 3.5 1.4MB
|    C: is 130MB IDE
|    BIOS is megatrends (or something like that)
| 
| 2) I've installed fastback plus and during install it says it can't use
|    the DMA (even low speed DMA)

Try running your machine at slow (viz. 8MHz) speed.  (It does have a
"turbo" or speed switch, doesn't it?)

I had this same problem on my 25MHz 386box, but slowing it down to 8MHz
allowed FB to use DMA.