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NMI
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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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