NMI

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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