Brian Chase <vaxzilla@jarai.org> wrote:
> On Sat, 22 Nov 2003 ragge@ludd.luth.se wrote:
>
> > > Does anyone know the CSR address(es) for the built-in AM79C30A
> > > audio/ISDN chip on the VAXstation 4000/VLC and the 4000/60?
> > >
> > Yes, on the /60 it is supposed to be at address 0x200D0000.
> > I think it is addressed byte-wise on longword addresses, or something.
>
> <grin>
>
> Oh good!  Based on examining a few of the most likely memory addresses
> on my 4000/VLC late last night, this is actually where I was guessing it
> would be located.  Specifically, the address range from 0x200D0000-
> 0x200D001C looked to be the most promising.  It'll be helpful to work
> under the assumption that it's to be accessed as bytes on the longword
> boundaries since that reduces the number of bytes I have to look at to
> only eight.

Matt Thomas mentioned plans to write a driver for the am79c30
a few years ago.  He may have additional information:
http://mail-index.netbsd.org/port-vax/2000/04/15/0004.html

-aw