Apple's cancelled future now opens in a browser

Apple cancelled Copland in August 1996, and you can now boot it in a browser tab. Michael Steil got the last build, D11E4 from June 1996, running in an improved DingusPPC emulator and posted it on his pagetable blog, where MacRumors and MacTrast both sent readers to try it.

Steil describes it as the OS that “was supposed to replace the old System 7 with a modern microkernel-based system,” and that’s why it still matters. MacTrast lists what it promised, including “protected memory, and preemptive multitasking.” MacRumors says that after the cancellation, Apple’s search for a new OS “led to the purchase of NeXT in 1997,” and NeXTSTEP became the precursor to Mac OS X. Some of Copland’s parts landed in Mac OS 7.6 and Mac OS 8, per MacTrast.

Getting it running took real work. Steil says Copland “is notoriously hard to run on real hardware” and had never been available in emulation. He lists “The 11 patches necessary for unlocking Copland” on a branch of his fork, a figure iPhoneSoft repeated in its own report. The fixes may stay there, since he notes that “DingusPPC does not take patches written with the help of AI.”

It’s unfinished, and it shows. Steil warns that “If any code hits an assertion, it drops into the debugger,” and you click Continue to get it moving again. It’s like touring a house before the drywall goes up, when you can still see every pipe and the builder’s pencil notes on the studs.

If you want to poke at it, Steil’s page has the steps. You click the screen to give the emulated Mac your keyboard and mouse, and Escape gives them back. He suggests trying “GXSlidemaster or Eric’s Solitaire” from the Applications folder. I’d give the debugger a few clicks of patience before deciding the whole thing crashed.

Thirty years late, Copland finally shipped, sort of.