I’m happy to finally be able to let the cat out of the bag. Darron Schall and myself have been working on a low level 6502/6510 emulator and, based on that, on a Commodore C64 emulator/simulator.

The emulator is completely written in Actionscript 3 and runs on Flash Player 9. It loads the original binary C64 Kernel ROMs at runtime, and executes them just like the original hardware would do.

The sources are released under GPL, get them here:
Trac: https://mirror1.cvsdude.com/trac/osflash/fc64/
SVN: http://svn1.cvsdude.com/osflash/fc64/

Quoting Darrons blog post from today:

It’s still a work in progress, and we’re looking for hardware-nerds to step up to the plate and help us finish it. The CPU code is complete, but hasn’t been extensively tested. The memory code is a work in progress, and we haven’t had a chance to start on the display code yet. Still though, it’s a good start.

At this point, we’re just running the CPU as fast as possible without trying to get the timing completely accurate. On the debug Flash Player, it runs at ~2.5 MHz. On the release Flash Player, it runs at closer to 6 or 7 MHz. This is a good thing, as the original Commodore chip only runs at 1 MHz. So, in theory, it should be possible to emulate the games in real-time without any slow down or speed delays (holy @#!@).