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It would cost a single flip-flop to prevent re-entering NMI handler, or at least the greatest part of it. The flip-flop output pin is routed to the /NMI pin, flip-flop reset is to actual NMI pulse source. The set pin would be then strobed programmatically (for example, doing out to a dedicated IO-port), as the last instruction before RETN. This way, there is ...

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