> Nestopia is a Nintendo NES emulator for Mac OS X. It is a direct
> port of the original Nestopia developed by Martin Freij for Windows.
>
> Nestopia supports a total of 201 different mappers, covering just
> about every known NES title. It can also open UNIF format NES games
> and NSF sound files. In addition to the standard NES pAPU, Nestopia
> supports six extra sound chips - Famicom Disk System, Konami VRC6,
> Konami VRC7, Namcot 106, Nintendo MMC5, and Sunsoft FME-07.
>
> Why is Nestopia so slow?
>
> Nestopia has been designed to be as accurate as possible. All The
> different components are synchronized "as needed" on a clock cycle
> level, basically meaning that the PPU and pAPU update themselves
> only if an instruction is going to change the way the PPU render
> pixels or the pAPU generates sound or else they simply just wait
> until the end of the frame and then carry on. They all use the
> "master clock" as a cycle counter base which eliminates the need for
> decimals altogether. With this method many games that rely on
> perfect timing work flawlessly on Nestopia (Mach Rider, Slalom,
> Marble Madness etc).
>
> This does mean that Nestopia is quite a lot slower than other NES
> emulators (which use scanline or tile based rendering). However, if
> you have an 800MHz G4 or faster, Nestopia is for you.
>
> Famicom Disk System
>
> Nestopia is fully compatible with Famicom Disk System games in .fds
> format. The file "disksys.rom" must be present in the same directory
> as Nestopia for these to work. Please do not ask me to send you this
> file; it is copyrighted software.
>
> Writing to FDS disks is not supported on the Macintosh at this time,
> as it is a fair bit of work to do and not something I see the need
> for. If this feature is important to you, then please let me know by
> e-mail and I'll see about implementing it.
>
> Source Code
>
> Nestopia is normally covered by the GNU General Public License.
>
> Martin Freij has generously agreed to license Nestopia to me under a
> closed-source license for the present. As soon as I have my API kit
> ready, a buildable version of Nestopia will be released with my
> shell library. The license for this has yet to be decided but most
> likely will be normal GPL with my shell excluded under section three
> of the license. This has been postponed repeatedly due to lack of
> time but will be released one day - honest!
>
> Please don't e-mail me to ask about source code in the interim.

Download 1 ? Nestopia Universal 1.4.1 for Mac OS X 10.4 or later

Download 2 ? Nestopia PPC 1.2.4 for Mac OS X 10.2 or later

The default control scheme is as follows:

D-Pad = Arrow Keys
A Button = Alt / Option
B Button = Shift
Start = Return
Select = Tab

Compatibility
Architecture: PPC x86 (Intel:Mac)

Mac OS X 10.2 or later