What you need:Additional emulators exist, but I haven't tried them: Executor and SoftMac. Both run under Windows. Executor is commercial, but does not require a ROM.
- An old Mac OS (up to OS 8.1 for B2, or OS 7.5.2 through 9.0.4 for SS). You can get OS 7.5.3 for free from Apple. E-Maculation has a downloadable OS 7.5.3 starter disk already prepared (4.3MB download).
- A Mac ROM. For B2, you must extract a ROM file from an old 68K Mac that you own. Use CopyROM or ROM-grabber for the extraction. For SheepShaver, use the Mac OS ROM Update 1.0, provided by Apple. None of the other Apple-distributed software-based New World ROMs, nor the Old World ROMs I've extracted from my own Macs have worked. However, to use this ROM, I think you'll need at least System 8.5 (I couldn't get it to run on OS 8.1; maybe older systems don't support New World ROMs?). Extract the ROM from the updater with TomeView. These extractors are themselves Classic apps, so you'll need access to a Mac capable of running Classic or older to get the ROMs.
- To run SS or B2 under Windows, you'll also need: (a) the Win32 Runtime Library of Simple DirectMedia Layer and (b) the Gtk+ Win32 Runtime Library. Just extract the contents of the downloaded files into the same directory as the SS and B2 .exe files.
via Mac OS X Hints.