ST questions

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2 total messages Started by Dazed and Confused Fri, 27 Dec 1985 16:42

#1843

Author: Dazed and Confused
Date: Fri, 27 Dec 1985 16:42

19 lines
1497 bytes

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?

2) Is there a way (say from BASIC) to turn off all graphics DMA (similar to
   the DMACTL register of the 400/800)?

3) What is it that causes INTERPC's terminal software to crash the system
   (usually)?

						Thanks in advance,
						cbosgd!nscs!jmk (Joe Knapp)

Re: ST questions

#1852

Author: nnamrreH cirE
Date: Mon, 30 Dec 1985 05:02

19 lines
1799 bytes

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

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