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From: bazyar@chip (Jawaid Bazyar)
Newsgroups: comp.sys.apple2
Subject: Re: GS Sound
Message-ID: <1991Jan15.223422.26131@ux1.cso.uiuc.edu>
Date: 15 Jan 91 22:34:22 GMT
References: <9101141356.AA15001@apple.com> <8173@hub.ucsb.edu> <42561@ut-emx.uucp>
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In article <42561@ut-emx.uucp> ifar355@ccwf.cc.utexas.edu (David H. Huang) writes:
>The DOC and the sound tools support 16 channels, but there is no way to get at
>the upper 8. The IIGS hardware reference definitely says that there are only
>3 bits available to determine the channel number. So, there are only 8 usable
>output channels.

  This is true.  However, the 16 generators are multiplexed onto the 2, or 4, or 8
output channels you happen to have hooked up.  ONCE AGAIN, this is how GS sound works.

  32 oscillators
  two are set aside for timing
  leaving 30
  which are combined in pairs, and set in swap mode
  to facilitate interrupt driven sound playback.
  Thus, there are 15 FIFTEEN sound output generators on the GS.

  Now can we shut up about this absolutely pointless topic?!?!?!  If you'd really READ
the Hardware manual, you'd know what I just said.

--
Jawaid Bazyar               | Being is Mathematics 
Senior/Computer Engineering | Love is Chemistry
bazyar@cs.uiuc.edu          | Sex is Physics
   Apple II Forever!        | Babies are engineering