Apple's failed Copland OS boots in a browser 30 years later

Thirty years after Apple abandoned Copland, its failed attempt to build a modern Mac operating system, the final developer build can now be booted in a browser. Developer Michael Steil, known as Mist, used an experimental fork of the DingusPPC Power Mac emulator. Copland D11E4 runs on a page at pagetable.com, and nothing needs to be installed.

How the browser boot works

Steil says the 11 patches that enable DingusPPC to boot Copland were written with AI assistance. The catch: upstream DingusPPC does not accept AI-assisted patches, so the fixes would need rewriting first. Nor should anyone expect miracles. D11E4, the last build Apple distributed to developers in June 1996, remains unfinished: if the emulated system hits an assertion, it drops into a debugger and asks the user to continue manually.

What Copland was meant to be

Copland was intended to replace Apple's System 7 with a PowerPC-native operating system built around a microkernel, protected memory and preemptive multitasking for system services. Three unfinished developer builds are publicly known: D7E1, D9 and D11E4; few outside Apple's developer community ever got to use them. Apple CEO Gil Amelio demonstrated Copland at the company's 1995 Worldwide Developers Conference, but the project never approached the stability required for release. Much of it existed as plans and documentation rather than code; in 2009 Steil assembled a large archive of that material, and its planned successor, Gershwin, never left the planning stage.

Why Apple killed it

Copland overran so badly that Amelio recruited Ellen Hancock from IBM as Apple's CTO to get it back on track. After reviewing its progress, she recommended cancelling it and acquiring an operating system elsewhere. Apple considered buying Be for BeOS or working with Sun on a Solaris-based system, and ultimately bought NeXT at the end of 1996, bringing Steve Jobs back along with NeXTSTEP. Hancock was later sidelined under Jobs and resigned in 1997. The first developer release of the NeXTSTEP-based successor, Rhapsody, followed in 1997 and evolved into Mac OS X Server 1.0 in 1999 and Mac OS X 10.0 in 2001.

What Copland left behind

Replacing the Mac OS architecture took years; meanwhile Apple folded some of Copland's more mature components into updates to the existing system. Mac OS 8, released in 1997, gained Copland's Platinum interface and a PowerPC-native, multithreaded Finder; Mac OS 8.1 followed in 1998 with HFS+, and Mac OS 8.5 became the first PowerPC-only release. NeXTSTEP's portability later helped Apple move to Intel, while OS X became the basis for the iPhone's and iPad's systems. Apple's future might have looked very different had Copland succeeded; today it is easier than ever to see why it did not.