Milan manufactured by MILAN Computersystems, Hades by Medusa Computer Systems). MagiC versions 6.0 through 6.2 were released also for use with Atari clone machines of the late 1990s (e.g. Version 4.0 added support for the Atari Falcon, and finally in 1995 version 5.0 brought the significant addition of loadable file system support, along with an implementation of VFAT with long file names, and a number of other improvements to the GEMDOS layer including threads and signals. The name changed from Mag!X to MagiC with the release of version 3.0, which added many improvements and a significant amount of MiNT compatibility. In contrast, MagiC offered preemptive multitasking, giving the ability to run multiple (well-behaved) GEM applications as well as other non-graphical software on the Atari ST series the Atari STE and Atari TT. At that time, TOS featured only limited multitasking in the form of desk accessory programs, simple programs accessed from the 'Desk' menu and that multitasked using cooperative task switching. MagiC was originally released as Mag!X (or MagiX) in 1992.

Some Atari ST programs assume they alone control the machine, are troublesome when multitasked (mostly graphics glitches).Magic-Mac and Magic-PC variants only run under Mac OS and Microsoft Windows respectively, not e.g.Drivers and file systems from MiNT are not compatible with MagiC.MagiC is not 100% compatible with the original TOS.MagiC was originally a commercial product and not freely available, like MiNT.

Significant performance advantages over both the original TOS and MiNT/MultiTOS platform on the same hardware.Loadable file systems and long file names.Extensive Atari TOS compatibility, the developer also created an improved variant (KAOS).The kernel of MagiC is largely written in hand-coded assembly language for Motorola 68000, and offers:

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