NMI: /N-M-I/ n. Non-Maskable Interrupt. An IRQ 7 on the PDP-11
or 680[01234]0; the NMI line on an 80[1234]86. In contrast with a
priority interrupt (which might be ignored, although that is
unlikely), an NMI is _never_ ignored. Except, that is, on clone
boxes, where NMI is often ignored on the motherboard because flaky
hardware can generate many spurious ones.
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