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From: pozar@kumr.UUCP (Tim Pozar)
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.misc,comp.os.msdos.programmer
Subject: DMA channel asignments
Keywords: DMA
Message-ID: <200@kumr.UUCP>
Date: 19 Oct 90 05:34:38 GMT
Reply-To: pozar@kumr.UUCP (Tim Pozar)
Organization: Late Night Software (San Francisco)
Lines: 26


    I am currently working on a driver for a very fast serial port.
I am interested in using one of the DMA channels on the AT.  (I expect
that this driver will be used on mainly '386 systems.)  I am trying
to find out what has been assigned to which channels on the DMA(s) on
the XT and AT.  

    Also, I noticed that TOPS's flashcard uses a default of channel 
1 at the address of 398.  Is this a pretty safe address to use?

    I tried to track some of this down via the IBM XT tech manual and 
a number of other books like Norton's and Duncan's, but to no avail.
I also checked out the latest Interrupt file (590) with VERY sparce
info on DMAs (read: useless for this project).  Is there another 
reference I should seek?

                   Thanks for any help...

                       Tim
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