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How printf()s work under C51?

Can any body tell me how printf() and the likes work under C51? If I don't have a display device, where does the output go? If I don't have a kernel and still want to use the functions and redirect the output to the serial port what should I implement first? I have already implemented a putch() function. Can I use it?

I'm a rookie here in C51. Would you help me on that? Thanks very much.

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