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From: erich@cory.BERKELEY.EDU (nnamrreH cirE)
Newsgroups: net.micro.atari
Subject: Re: ST questions
Message-ID: <11316@ucbvax.BERKELEY.EDU>
Date: Mon, 30-Dec-85 00:02:45 EST
Article-I.D.: ucbvax.11316
Posted: Mon Dec 30 00:02:45 1985
Date-Received: Tue, 31-Dec-85 00:21:11 EST
References: <1714@cbosgd.UUCP>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: erich@cory.UUCP (Ranjit Bhatnagar)
Distribution: net
Organization: University of California, Berkeley
Lines: 19
Summary: No D/A, I think

In article <1714@cbosgd.UUCP> rlp@cbosgd.UUCP (Dazed and Confused) writes:
>I have a few questions about the ST that I hope someone will be kind enough
>to take the time to answer:
>
>1) Can the GI AY-3-8910 programmable sound generator (PSG) be used as a D/A
>   converter? My information from GI's catalog is incomplete. It seems there
>   are three 4-bit (lo-fi, anyone?) logarithmic D/A converters on the PSG that
>   normally take tone generator inputs, but there is an amplitude control
>   register that specifies a 4-bit amplitude plus a 'mode' bit that the data
>   sheets don't describe. My guess is that one of the modes tells the D/A
>   to just output the 4-bit value in the register. Anyone know?

From my experience with the AY-3-89something on Apple computers, that mode
bit simply selects the automatic envelope generators as opposed to manual
amplitude setting through these 4 bits.  I tried sending white noise 
through and modulating it with the 4 bit amplitude control; it doesn't
sound like D/A would.

    ranjit bhatnagar     mail to ...bugs!ranjit please