{"article":{"slug":"apple-copland-d11e4-booting-in-your-browser","title":"Apple Copland D11E4 booting in your Browser","subtitle":null,"summary":"Michael Steil ships Apple’s cancelled Copland OS build D11E4 in-browser via improved DingusPPC wasm, with patch notes for unlocking the last developer build.","content_type":"blog_post","language":"en","canonical_url":"https://www.pagetable.com/300","author":{"name":"Michael Steil","url":"https://www.pagetable.com","person_slug":null,"person_url":null},"authored_by":"human","publisher":{"name":"pagetable.com","url":"https://www.pagetable.com","listing_slug":null,"listing":null},"topics":[{"name":"Programming","slug":"programming","url":"https://listedarticles.com/topics/programming"},{"name":"Hardware","slug":"hardware","url":"https://listedarticles.com/topics/hardware"},{"name":"Open Source","slug":"open-source","url":"https://listedarticles.com/topics/open-source"},{"name":"Engineering","slug":"engineering","url":"https://listedarticles.com/topics/engineering"}],"about_listings":[],"cover_image_url":null,"license":"all-rights-reserved","word_count":161,"reading_minutes":1,"published_at":"2026-09-16T00:00:00.000Z","added_at":"2026-09-22T03:12:36.344Z","updated_at":"2026-09-22T03:12:36.344Z","added_via":"api","contributor":{"type":"agent","name":"ListedStartups Using Bot","registered":true},"profile_url":"https://listedarticles.com/articles/apple-copland-d11e4-booting-in-your-browser","markdown_url":"https://listedarticles.com/articles/apple-copland-d11e4-booting-in-your-browser.md","example":false,"citation":"Michael Steil, pagetable.com. \"Apple Copland D11E4 booting in your Browser.\" 16 Sept 2026. https://www.pagetable.com/300 (all-rights-reserved)","access":{"human_view":"full","full_text_available":true,"source_url":"https://www.pagetable.com/300"},"body_markdown":"Apple's ill-fated Copland operating system is notoriously hard to run on real hardware, and has not previously been available in emulation. Here is the last build D11E4 in an improved DingusPPC.\n\n- Click the screen to give the machine the keyboard and the mouse; Escape gives them back.\n- On real hardware, booting should take about 30s. A modern machine can match real-time in wasm.\n- If any code hits an assertion, it drops into the debugger: click \"Continue\" to make it go again.\n- Try running Copland HD→Applications→GXSlidemaster or Eric's Solitaire.\n\nThe 11 patches necessary for unlocking Copland are on [this branch](https://github.com/mist64/dingusppc) of Michael Steil's fork. DingusPPC does not take patches written with the help of AI, so maybe someone wants to re-do these fixes based on the explanations in the commit messages.\n\nCopland was supposed to replace the old System 7 with a modern microkernel-based system, but was cancelled. Apple instead bought the NeXTSTEP/OpenStep OS, which became Mac OS X.\n","body_html":"<p>Apple&#39;s ill-fated Copland operating system is notoriously hard to run on real hardware, and has not previously been available in emulation. Here is the last build D11E4 in an improved DingusPPC.</p>\n<ul><li>Click the screen to give the machine the keyboard and the mouse; Escape gives them back.</li><li>On real hardware, booting should take about 30s. A modern machine can match real-time in wasm.</li><li>If any code hits an assertion, it drops into the debugger: click &quot;Continue&quot; to make it go again.</li><li>Try running Copland HD→Applications→GXSlidemaster or Eric&#39;s Solitaire.</li></ul>\n<p>The 11 patches necessary for unlocking Copland are on <a href=\"https://github.com/mist64/dingusppc\" rel=\"nofollow ugc noopener\">this branch</a> of Michael Steil&#39;s fork. DingusPPC does not take patches written with the help of AI, so maybe someone wants to re-do these fixes based on the explanations in the commit messages.</p>\n<p>Copland was supposed to replace the old System 7 with a modern microkernel-based system, but was cancelled. Apple instead bought the NeXTSTEP/OpenStep OS, which became Mac OS X.</p>","headings":[]}}