My bad.  The Circuit Cellar article is for the RTL8019, not the 8139.  Not
certain the difference -- will look more at the RealTek web site:
  www.realtek.com.tw

Jonathan Sadler

Jonathan Sadler wrote:

> Christopher -
>
> I know that the BBA is using a standard RealTek RTL8139, however there is an
> ASIC (SEGA Part 315-6310?) on the BBA to handle the "glue".  Not knowing the
> details of the BBA/Modem slot interface, I have no idea how complex the logic
> is in the ASIC.  Gut feel is it wouldn't need to be too complex, as the
> RTL8139 is an easy to interface chip.  (For example projects, try Circuit
> Cellar's article from July '99 found at:
> http://www.chipcenter.com/circuitcellar/july99/c79bl1.htm)
>
> Anyone know more?  Maybe it's time to spelunk the BBA driver...
>
> Jonathan Sadler
>
> Christopher John Thomas wrote:
>
> > On Fri, 6 Jul 2001, Jonathan Sadler wrote:
> >
> > > Seems they have information on the "modem/BBA slot" card edge connector
> > > in order to get this working.  Wonder if a BBA alternative is
> > > possible...
> >
> >   Forgive me if this is a newbie question, but - is the BBA slot just a
> > PCI bus, or something alien?
> >
> >   The NetBSD boot screen lists a PCI bridge when I have the BBA hooked up,
> > which suggests it's a stock network chip with a bridge chip connecting it
> > to the Dreamcast's bus.
> >
> >   If this is the case, any idea if Sega is selling these chips to
> > third-party developers? :) [dusts off soldering iron]
> >
> > Ttyl,
> >                                 -Christopher Thomas