Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!microsoft!kentsu
From: kentsu@microsoft.UUCP (Kent Sullivan)
Newsgroups: comp.sys.cbm
Subject: Re: C128D
Message-ID: <8055@microsoft.UUCP>
Date: 15 Oct 89 21:52:12 GMT
References: <89276.135528MHM104@PSUVM.BITNET> <23035@cup.portal.com> <471@uwm.edu>
Reply-To: kentsu@microsoft.UUCP (Kent Sullivan)
Organization: Microsoft Corp., Redmond WA
Lines: 25

In article <471@uwm.edu> jgreco@csd4.csd.uwm.edu (Joe Greco) writes:
>
>Actually, I believe it is a design flaw that the speech synthesis relies on.
>A long time ago, a friend was working on a speech digitizing and recreation
>program that relied on the SID to provide a pop when needed to generate the
>sounds (I believe this was accomplished via the volume register).  Similar
>to the pop you hear when you put the SID volume from 0 to 15 suddenly...
>
>In any case, I do also recall that he had some problems when he ran into a
>newer version of the SID which had the popping problem greatly reduced....
>his program became quite mute.  That's what you get for relying on sneaky
>techniques and hardware bugs.

You're right, Joe.  I talked with one of the test engineers for the 6582/
8580 SID chip, which is the new 9 VDC version used in 64Cs and 128Ds.  He
said that a lot of work had been done to clean up the filtering, and as a
result, the behavior is quite different from the 6581 SID.  You have to use
radically different capacitor values for the 6582/8580 as well.  I have noticed
poor sound from digitized samples when played on the 6582/8580 too.

Kent Sullivan
Microsoft Corporation

The opinions expressed in this article are my own and do not necessarily
reflect those of my employer.