I believe there's a 3E binary on this list:
http://www.biglist.com/lists/stella/archives/200501/msg00023.html
>From: "atari2600" <atari2600@xxxxxxxxxxxxx>
>Reply-To: stella@xxxxxxxxxxxxxxxxxx
>To: stella@xxxxxxxxxxxxxxxxxx
>Subject: Re: [stella] Stella 2.0 Alpha 3 available
>Date: Sun, 3 Jul 2005 23:39:17 -0400
>
>I don't have a testbed binary handy (I'm still on holiday in the USA), but
>the information in that post about the 3E format was mostly correct. The
>only glaring error I can see is that switching in a ROM bank via write to
>3F actually switches in a 2K ROM bank, not 1K. The 2K area occupies the
>same address space as the read and the write areas of the 1K RAM bank
>similarly switched in by a 3E write. To write to RAM, write to
>address+$400.
>Cheers
>A
>
>
>-------Original Message-------
> > From: "B. Watson" <atari@xxxxxxxxxxxxxx>
> > Subject: Re: [stella] Stella 2.0 Alpha 3 available
> > Sent: 03 Jul 2005 20:27:13
> >
> > On Sun, 3 Jul 2005, atari2600 wrote:
> >
> > > I would like to check this out on Boulder Dash (R) -- but I'm
> > > wondering... does Stella handle 3E bankswitching?
> >
> > Apparently not: there's no Cartridge3E class and no mention of the
>string
> > "3E" in the source anywhere.
> >
> > If you can point me to a web page or something with a good description
> > of the 3E scheme, I'll (attempt to) add support for it. Actually I
> > found your original post about it:
> >
> > http://www.biglist.com/lists/stella/archives/200505/msg00128.html
> >
> > There may be enough information there... Though it'd be nice to have at
> > least one ROM image that uses 3E, so I can test my code. Apparently you
> > can't just send me your binary for copyright reasons, but maybe early
> > on in your work you wrote a test ROM that just switches banks and does
> > something like display different colors in the different banks...?
> >
> > Also, you'll probably have to generate your own stella.pro entry for
> > your binaries: I don't know if I'll be able to auto-detect 3E mode.
> >
> > --
> > B.
> > Archives (includes files) at
>http://www.biglist.com/lists/stella/archives/
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