On Tue, 13 Jul 1999 19:45:46 -0700 (PDT), Colin Wood <cwood@ichips.intel.com> wrote:
> Ken Nakata wrote:
> > On Tue, 13 Jul 1999 19:58:13 -0500 (CDT), Frederick Bruckman <fb@enteract.com> wrote:
> > > 
> > > Do you have any information on the Singer codec in the AV macs? All
> > > I've been able to find so far is the code name of the chip.
> > 
> > I do.  Singer is Apple's code name, but it's actually a codec chip
> > developed and sold by another company (I think the company was called
> > ITT or something).  I downloaded the PDF datasheet off the Net a while
> > ago
> oooohhhh....that'd be very cool.

Ok, I was wrong.  I found it!  Go to:

http://www.itt-sc.de/pages/product_documentation/multimedia/asc.html

It says ASC 3553O, but it is the Singer chip.  It's ASC 3553O instead
of ASCO 2300 only because they've changed the IC type designation from
ASCO 2300 to ASC 3553O!

BTW, Apple's _Quadra 840AV and Centris 660AV Developer Note_ says, at
page 16:

	The Singer is an I/O chip that constitues a 16-bit digital
	sound codec.  It conforms to the IT&T ASCO 2300 Audio-Stereo
	Codec Specifications. ...

It sounds like there's a codec standard or something called ASCO 2300,
or the Singer is an ASCO 2300 compatible chip, but if you open the
case, you'll find a chip with the number ASCO 2300 silk-printed on
top.  At least that's what's sitting on my Q840AV's logic board.

Happy hacking,

Ken