An emulator from Apple that ran PowerPC-based applications on Intel-based Macs under OS X when Apple transitioned from Power to Intel x86 CPUs (see Intel Mac
). Introduced in 2006 with Apple's first Core Duo-based laptops, Rosetta ran all PowerPC applications except those that used specific instructions in G5 processors (see G5
Named after the Rosetta Stone, which inscribed a decree in 196 BC of the Egyptian King Ptolemy V in three languages, the Rosetta emulator was discontinued in 2011 with the Lion version of Mac OS X.
Rosetta 2 - For ARM-Based Macs
Starting in late 2020, Apple once again began switching hardware platforms (see Apple M1
). Rosetta 2 runs Intel x86 applications in ARM-based Macs.