Apple buried Copland 30 years ago. Now the failed OS boots in a browser

Thirty years after Apple abandoned Copland, a new emulator lets you experience the final developer build of the failed operating system in your web browser. Copland aimed to replace Apple's aging System 7 with a PowerPC-native OS featuring a microkernel, protected memory, and preemptive multitasking. Three unfinished developer builds – D7E1, D9, and D11E4 – were publicly known, but most people outside Apple's developer community didn't get to try them.

Now, developer Michael Steil, also known as Mist, made it possible to boot Copland D11E4 in a browser using an experimental fork of the DingusPPC Power Mac emulator. The patches enabling DingusPPC to boot Copland were written with AI assistance, though the upstream project doesn't accept AI-assisted patches, so the fixes would need to be rewritten for incorporation.

Copland, demonstrated by Apple CEO Gil Amelio at the 1995 Worldwide Developers Conference, never reached the stability needed for release. Much of Copland existed as plans and documentation instead of finished code. Ellen Hancock from IBM was brought in to rescue Copland, but after reviewing its progress, she recommended cancelling it and acquiring an operating system elsewhere.

Apple considered alternatives like acquiring Be for BeOS and working with Sun on a Solaris-based system, but ended up buying NeXT instead. Copland's cancellation led to the development of Rhapsody, which evolved into Mac OS X Server 1.0 and the consumer release of Mac OS X 10.0 in 2001. While Apple folded some of Copland's mature components into updates to its existing OS, the project's failure had a significant impact on Apple's future.