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MachTen development started in 1989, and the first release in 1991 has Mach 2.5 and 4.3BSD -Reno. The second release in 1992 has the X Window System. Early releases do not support System 7, and later versions support System 6 with MultiFinder, and System 7.
In 1993, release 2.1 introduced virtual memory, memory protection, and an improved paging model for Mac applications. Since then, MachTen was published as Personal MachTen, and Professional MachTen with development tools and virtual memory. Release 2.1.1 was announced in 1994, introducing virtual memory support for Motorola 68040. Professional MachTen for Motorola 68000 -based Macintoshes ended with release 2.3, announced in 1996 for low-cost web servers.
In 1995, Power MachTen was launched for Power Macintosh, with release 4.0 supporting shared libraries and memory-mapped files, and a 4.4BSD-based, POSIX -compliant distribution. Release 4.1 was in March 1998, and 4.1.1 in July 1998 with discounted prices. Power MachTen lacks some of the features of Professional MachTen (including true virtual memory and memory protection) but is PowerPC native and is compatible with Mac OS 9 through its final version, 4.1.4, released in February 2000. Tenon discontinued MachTen in October 2001, citing the release of Mac OS X as a successor.