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view source for mac operating systems wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for mac operating systems add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide mac operating systems you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page copland main copland operating system copland operating system copland was a project at apple to create an updated version of the classic mac os it was to have introduced memory protection protected memory preemptive multitasking and new underlying operating system features yet still be compatible with existing mac software they originally planned the follow up release gershwin to add multithreading computer architecture multithreading and other advanced features new features were added more rapidly than they could be completed and the completion date slipped into the future with no sign of a release in 1996 apple canceled the project outright and sought a suitable third party replacement copland development ended in august 1996 and in december 1996 apple announced that it was buying next for its nextstep operating system ref name pcworld project failures cite web url http www pcworld com article 152103 it_project_failures html title lessons learned it s biggest project failures work pcworld last widman first jake date october 9 2008 access date october 23 2012 df mdy all archive url https web archive org web 20121105191809 http www pcworld com article 152103 it_project_failures html archive date november 5 2012 url status live ref return to mac operating systems retrieved from https en wikipedia org wiki mac_operating_systems privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for mac operating systems add languages add topic