What does the "N" in "zsN: silo overflow", and other "zsN" messages, signify?

	signify?

        The name "zsN" is ambiguous.

        In kernel "config" files, and in the boot-time autoconfig
        messages, "zs0" is the first on-board Z8530 chip, the two
        channels of which handle "ttya" and "ttyb", respectively, and
        "zs1" is the second on-board Z8530 chip, the two channels of
        which handle the keyboard and mouse ports, respectively.

        In "zsN: silo overflow" messages and the like:

                "zs0" is the A channel on the first on-board Z8530, handling
                    "ttya";

                "zs1" is the B channel on the first on-board Z8530, handling
                    "ttyb";

                "zs2" is the A channel on the second on-board Z8530, handling
                    the keyboard;

                "zs3" is the B channel on the second on-board Z8530, handling
                    the mouse.

        So a "zs0: silo overflow" error is for "ttya", and a "zs1: silo
        overflow" error is for "ttyb", not for the keyboard or mouse.
        Keyboard silo overflows are "zs2: silo overflow"; mouse silo
        overflows are "zs3: silo overflow".

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