07h BT$NMDN switch off NMIs to the processor
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Description This system service routine switches off NMIs to the processor.

NOTE: As the NMI interrupt is used to provide the system clock the system time will be invalid. It is possible to switch off NMIs and still maintain a valid system time (see BT$NOF).

If NMIs are switched off with this service then they should be switched back on with the BT$NMEN service.

Example
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