Spectre GCR
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The Spectre GCR was a hardware add-on to the Atari ST computers that plugged into the cartridge port. Designed by David Small and sold through his company Gadgets by Small, it basically turned the Atari ST into an Apple Macintosh computer (basically a Macintosh Plus). It was the final and best Macintosh 'emulator' for the ST, and replaced the previous products Magic Sac and Spectre 128.
The Spectre GCR required the owner to purchase a set of official Apple Macintosh 128K ROMs and the Macintosh Operating System 6.0.8 disks. This avoided any legal issues of copying/pirating Apple's software. The user also has to obtain and use the SCM124 black & white monitor. The Spectre GCR plugged into the floppy port, and controlled the floppy like a standard Macintosh floppy, thus allowing one to run most Macintosh software.
Although Spectre GCR would run in 1MB of memory, 2MB or more was recommended.