Frodo is a poor emulator that is short on feature and really not worth bothering with. If you want the most accurate and full featured 64 (and VIC-20, 128, Plus/4 and PET) emulator out there, get VICE (http://www.viceteam.org/) which is completely free. If you want a relatively accurate emulator that is really well integrated with OS X, easy to use and you're willing to pay for it, get Power64 (http://www.infinite-loop.at/Power64/index.html).