Each instruction set architecture is incompatible with its predecessor, necessitating a transition plan based on a software layer to emulate the previous instruction set on the succeeding one.

Macintosh has used CPUs with several different instruction set architectures: the Motorola 68000 series, PowerPC, Intel x86, and ARM64 in Apple silicon. Rosetta 2, introduced in 2020 as a component of macOS Big Sur, is part of the Mac transition from Intel processors to Apple silicon, allowing Intel applications to run on Apple silicon Macs. Support for Rosetta was dropped with the release of Mac OS X Lion (10.7) in 2011. The first version of Rosetta, introduced in 2006 in Mac OS X Tiger, was part of the Mac transition from PowerPC processors to Intel processors, allowing PowerPC applications to run on Intel-based Macs. The name is a reference to the Rosetta Stone, the artifact which enabled translation of Egyptian hieroglyphs. It enables a transition to newer hardware, by automatically translating software.

for macOS, an application compatibility layer between different instruction set architectures. Its LCD IPS 10.1' 1024×600px HDMI Waveshare 11870 screen is turned 180°, so that the wiring does not interfere with the upper Macintosh frame.Rosetta is a dynamic binary translator developed by Apple Inc. 'I bought my Macintosh Classic II case on eBay - it was completely yellow, but I restored it to the factory condition by means of 18 per cent hydrogen peroxide and appropriate light exposure. 'My version of MacintoshPi is driven by Raspberry Pi 3B+,' Jaromaz explains of his physical Mac recreation. Jaromaz didn't create the emulator alone: The MacintoshPi project builds atop the existing Basilisk II and SheepShaver emulator, for Mac OS 7-8 and Mac OS 9 respectively, and if Mac OS compatibility isn't enough Jaromaz has squeezed an emulator for Commodore 64, Commodore 128, and Commodore PET emulation into the bundle for good measure. The second reason is performance: By reducing background tasks to a bare minimum, the emulator can run on almost - but not quite - any Raspberry Pi from the Raspberry Pi 2 upwards. The first is aesthetics: The system boots rapidly and shows the Mac OS environment full-screen, making it convincing if installed inside original hardware to replace a faulty motherboard. There are a couple of very good reasons why Jaromaz sought to build MacintoshPi without relying on a graphical environment. This handy tool turns a Raspberry Pi into a classic Apple Mac, or a Commodore PET/C64/C128.

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