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Basilisk II is an open source software emulator which emulates the 680x0-based Apple Macintosh computer on a variety of operating systems, including BeOS, Linux, Windows NT and Mac OS X.
The last version of Mac OS that can be run within Basilisk II is Mac OS 8.1, the last 680x0-compatible version. Newer Mac OS versions aren't compatible with Basilisk II because those newer versions require a PowerPC-based processor, which can't be emulated by the program. To run such operating systems, emulators that can emulate PowerPC-based processors, like PearPC, are needed.
Alpha versions were available from January 1999 with the first non-alpha release in October of the same year.