Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!UMDD.BITNET!BBOURBIN
From: BBOURBIN@UMDD.BITNET (Brett S Bourbin)
Newsgroups: comp.sys.amiga
Subject: DMA control
Message-ID: <8803031951.AA06762@jade.berkeley.edu>
Date: 3 Mar 88 19:40:33 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 21

I am writing a assembly language game and I am not using Intuition in the
program so I disable Intuition from using port 0, which I use for my own
control, and I want to get rid of all the sprites.  I do not use the sprite
hardware at all, since I use an overscanned screen, so I want to shut down all
sprite DMA and turn off raster DMA until I set up my screen.

So here is the code I am using:
      XREF _custom
      movea.l _custom,a6
      move    #DMAF_RASTER!DMAF_SPRITE,dmacon(a6)

and to turn it on:
      move    #DMAF_SETCLR!DMAF_MASTER!DMAF_RASTER,dmacon(a6)

Is this the correct method for doing this, or do I have to SetPointer() to
a null sprite?  Also, is this legal, since this is direct hardware access or
is there a system function to turn off/on the DMA?  I want to follow all the
rules that Commodore states, but I can find no information on this.

Brett S Bourbin
President Selgus Ltd.
BITNET: BBOURBIN@UMDD