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From: sam@amiga.UUCP (Samuel C. Dicker)
Newsgroups: net.micro.amiga
Subject: Re: Can't make Non-DMA audio out work.
Message-ID: <882@amiga.amiga.UUCP>
Date: Thu, 20-Mar-86 00:19:03 EST
Article-I.D.: amiga.882
Posted: Thu Mar 20 00:19:03 1986
Date-Received: Sat, 22-Mar-86 04:06:07 EST
References: <1020@cadovax.UUCP>
Reply-To: sam@snidely.UUCP (Samuel C. Dicker)
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 20

In article <1020@cadovax.UUCP> keithd@cadovax.UUCP (Keith Doyle) writes:
>Been trying to get non-DMA audio output to work...
I got this from Glenn Keller who designed Paula (the audio chip):

 Using nonDMA audio
    gjk  18-mar-86

If you want the input period to track the output period:
   Set the period to what you want with the dma off.
   Collect 4 bytes, collect the 1st 2 in a word.
   (clear the interrupt, output, collect 2 more, poll interrupt) loop

If you want the output period to track the input period:
   Set the period small (like 1 ) with dma off
   (collect a byte, duplicate into a word (two identical bytes),clear
    interrupt, send word); loop

Note: An update has been sent to the hardware manual people with
  exact details of the audio controller state machine for those
  who want even more detail.