16-Port asynchronous adapters adapter board priority

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The interrupt arbitration logic sets priority for adapters according to a specific scheme.

Adapter   Priority
    0     Highest
    1       |
    2       |
    3       |
    4       |
    5       |
    6       |
    7       |
    8       |
    9       |
    10      |
    11      |
    12      |
    13      |
    14      |
    15    Lowest

The DUART channels with pending interrupts are serviced according to a fixed-priority scheme. The highest priority is assigned to port 0. Next in priority is port 1, and so forth. The lowest priority is port 15.