High Quality Content by WIKIPEDIA articles! 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, AmigaOS, Windows NT, Mac OS X and even on the Sony PSP. 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 SheepShaver or PearPC, are needed. Alpha versions were available from January 1999 with the first non-alpha release in October of the same year.