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This procedure is executed in response to a transmitter interrupt. It should be compared with “pcpint” (8739) and “lpint” (8976). Note that the parameter “dev” is a masked version (low order five bits preserved) of the “new processor status” word in the interrupt vector. Provided the vector was properly initialised, the minor device number will be properly identified.
The second part of the test on line 8074 will be discussed at the end of the next chapter.
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