These extractors are themselves Classic apps, so you'll need access to a Mac capable of running Classic or older to get the ROMs. Extract the ROM from the updater with TomeView. 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?). 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. For SheepShaver, use the Mac OS ROM Update 1.0, provided by Apple. Use CopyROM or ROM-grabber for the extraction. For B2, you must extract a ROM file from an old 68K Mac that you own. E-Maculation has a downloadable OS 7.5.3 starter disk already prepared ( 4.3MB download).

You can get OS 7.5.3 for free from Apple. An old Mac OS (up to OS 8.1 for B2, or OS 7.5.2 through 9.0.4 for SS).B2 emulates an old 68K Macintosh, while SS emulates a PowerPC Mac. Do you use an Intel-based Mac but still have a few essential Classic (pre-OS X) Mac applications you want to run? Recent universal compiles allow you to use SheepShaver (SS) or Basilisk II (B2) to run Classic software in emulation on Intel Macs under Mac OS X directly - or under Windows via dual-boot or Parallels virtualization.

Mac classic emulator for mavericks