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"If the modem has to interrupt the CPU 1440 times a second, it certainly eats up a lot of the time available for other things." That's theory, that's not knowledge. After all if you assume that an interrupt takes a 1000 instructions to process, then you are talking about perhaps 5% of the CPU for handling the device. Who knows if the figure of 1000 is reasonable or not (it is ludicrously high but, these big operating systems are in the ludicrousness budiness :-) the point is that just assuming without measurement is entirely unconvincing, it's no better than guessing.