Actually, Copland was an entire OS architecture that never saw the
light of day. It was to run on a Unix-like nanokernel called
NuKernel. It was to have partially protected memory (with some code
areas still allowing read-write access by applications - something
about "re-entrant code", I don't remember the details), and huge
chunks of the low-level operations were to be executed as threads
that would multitask preemptively in the background.
And yes, it was to have a more modern sleeked-up user interface,
which DID in fact get rolled out eventually in MacOS 8. But most of
the really big architectural changes of Copland got cancelled, along
with the roadmap to the next iteration, Gershwin, which was to be a
pure preemptive multitasking / protected memory OS.
Aside from the user interface, which was called "Platinum", the only
parts of Copland to make it into the MacOS were Finder threads (under
System 7 you could not do anything once a file copy had started,
until it was completed; in MacOS 8 for the first time you could start
multiple simultaneous file copy operations, empty the trash while
they were running, and switch to another app while the Finder
finished up its file operations); oh, and perhaps Open Transport,
that might've originated as part of Copland, I'm not sure.
--
Allan Hunter
<[EMAIL PROTECTED]>
http://members.bellatlantic.net/~adhdah/FmPro/fmdevindex.html
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