Rosetta uses QuickTransit technology licensed from Transitive Corporation, and works transparently from the end-user, leading Apple to market it as "the most amazing software you'll never see." as it, unlike most emulators, does not have a user interface. Though it wasn't included in by defualt on Snow Leopard users can optionally reinstall it from the Snow Leopard DVD or chose to install it with the OS when preforming a fresh install. Rosetta Apple's official PowerPC emulator for x86-based Macs included in Tiger (10.4.4). In 2015, a Google Summer of Code event brought PowerPC Macintosh support from a curiosity to a possibility and it now supports a specific range of versions as of 2017. QEMU Best known for its use as an x86 hypervisor, QEMU also emulates a wide range of CPU architectures. Sound is not emulated unless you use a buggy and now outdated fork. PearPC lacks a GUI (even the "Change CD" button is removed in the most recent builds), so using a frontend may be necessary. It was the subject of controversy when a closed-source emulator, CherryOS, was revealed to have used code stolen from PearPC. It once had lots of developer momentum, but activity and interest declined significantly following Apple's 2005 transition to Intel processors. PearPC This emulator had been developed since 2004, and is capable of booting OS X 10.1-10.4, but not prior Mac OSs, nor OS X's Classic environment. Like Basilisk and vMac, it needs a firmware image from a working Mac. It hasn't seen significant development in a while, not to mention that it is riddled with hacks and workarounds, which accounts for why some applications such as the default bundled Internet Explorer flat-out crash. It boots System 7.5.2 through (due to a lack of MMU emulation) OS 9.0.4, runs most Mac applications at full speed on any modern PC, and can interface with and copy files to and from host hardware. Originally commercial software named ShapeShifter, it is the companion app of the 68k Mac emulator Basilisk II. SheepShaver An open-source "run-time environment" that includes a PowerPC emulator for non-PowerPC host systems.
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