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Forgive the dumb question... it's been ages since I've done Amiga programming in C. What behaves differently? Is the lower K of memory mapped, such that null pointer deferences cause excitement rather than simply crashing your program? Or is it something else?

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AmigaOS has no memory protection whatsoever. If your program crashes, so does the entire machine. And it will possibly bring your hard drive with it, too.

Not unworkable, but not the most relaxed environment for fast’n’fun cowboy coding. You typically have to reboot a lot.

I thought the Amiga 1k had page protection, just not virtual memory?

No, there's no MMU.

Well, apparently if your CPU has one (030+) you can use something like Enforcer (http://www.sinz.org/Michael.Sinz/Enforcer/). I’ve yet to try it.

No MMU.

A1000 has... something. The WORM (write once read many), RAM used for the kickstart, which is latched as read-only after the kickstart has been loaded from floppy by the bootstrap ROM.

I don't get it either, particularly as most advent challenges can be solved using just iso c and its standard library.

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