Hyper64
a Commodore - 64 Emulator on the Windows/DOS platform
Hyper64 is a working proof-of-concept of an experimental C64 emulator implementation without resorting to a conventional CPU emulation, but instead utilizing a realtime dynamic recompilation engine – which disassembles, analyzes and re-assembles the 6510 machine code as native 32-bit x86 code. It further uses a fast translation code cache.
Author's website:
http://micro64.de/