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How do I create a weak function via Keil Cx51?
Then having the default handler in a library (a true, pre-built, binary) would solve that - the linker will only take the function from the library if it isn't provided by the user.
How about C++ on a C51 :-)
Filip Natronce would be the man to ask about that
http://www.keil.com/forum/10074/