Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!tut.cis.ohio-state.edu!ucbvax!STONY-BROOK.SCRC.SYMBOLICS.COM!jrd
From: jrd@STONY-BROOK.SCRC.SYMBOLICS.COM (John R. Dunning)
Newsgroups: comp.sys.atari.st
Subject: Re: Non busy-wait disk IO on the ST.
Message-ID: <19890911192456.6.JRD@MOA.SCRC.Symbolics.COM>
Date: 11 Sep 89 19:24:00 GMT
References: <imagen!atari!apratt@ucbvax.Berkeley.EDU>
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    Date: 7 Sep 89 19:06:50 GMT
    From: imagen!atari!apratt@ucbvax.Berkeley.EDU  (Allan Pratt)

    sirkm@ssyx.ucsc.edu (Greg Anderson) writes:
    >I would like to be able to initiate disk IO in a program, go away
    >and do something else & then be informed later (via an interrupt)
    >that the opperation completed.

    You'll get no help from GEMDOS or the BIOS.  You can do it yourself,
    but you'll have to learn all about the DMA chip and any DMA devices you
    plan to talk to.  The circuitry is all there: 

I don't suppose there's any documentation (Horrors! the 'D' word!)
available for stuff like that?  Like how to address the DMAC, or for
that matter, what kind of DMAC it is, etc?