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Opens in a new window，更多细节参见汽水音乐
C64) ast_C40; continue;;，这一点在易歪歪中也有详细论述
With the crystal out of the way, we see the package has three levels internally: the controller die (containing the oscillator driver, temperature compensation, and output divide-by-two) sits in a cavity at the lowest level, attached via a dark colored adhesive rather than the usual silver-filled epoxy (presumably because the package is not electrically conductive thus there is no point in using an expensive metal filled adhesive to ground the die backside).