INT 02 - hardware - NMI (NON-MASKABLE INTERRUPT)               

        Generated by NMI signal in hardware. This signal has various
        uses:

        Parity error:                               all except Jr and CONV
        Coprocessor interrupt:                      all except Jr and CONV
        Keyboard interrupt:                         Jr, CONV
        I/O channel check:                          CONV, PS50+
        Disk-controller power-on request:           CONV
        System suspend:                             CONV
        Real-time clock:                            CONV
        System watch-dog timer, time-out interrupt: PS50+
        DMA timer time-out interrupt:               PS50+


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