On Mon, 31 Jul 2000, Benjamin Herrenschmidt wrote:

> On Sat, Jul 29, 2000, Emmanuel Dreyfus <p99dreyf@criens.u-psud.fr> wrote:
> 
> >What is the status of the Apple sound chip? As I understand, the only
> >support there is for it is just beeping.
> >
> >How difficult would it be to get it fully supported? Where could I find
> >some documentation about that chip? I assume that Darwin driver might
> >help, but there are 3 audio drivers in Darwin: drvPPCAwacs,
> >drvPPCBurgundy, and drvPPCDACA. Is there 3 different audio chips?
> 
> Awacs is the one used on most machines. The latest revisions of it are
> also called "screamer" and contain more registers and some power
> management features.
> 
> Burgundy is used on iMacs, B&W G3s and maybe other machines
> 
> DACA is the I2S/I2C based chip used in the iBook
> 
> All 3 use a common mecanism for sending/receiving audio datas (thru DBDMA
> channels) so the code for that can be common. The differences reside in
> the various "control" registers.

To add even more confusion, AWACS is really a superset of "Singer", used
in some of the NuBus... PowerBooks, was it?  And Quadra AVs, IIRC....


David

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