On 20/06/2022 00:14, chris wrote:
Early processors often had just a couple of interrupt pins, irq and nmi,
You mean microprocessors. NMI seems to be a concept that was introduced with microprocessors, and multi-priority interrupts existed before even the earliest microprocessors.
In terms of software, I don't think typical Linux code really fully supports multi-level interrupts, and, if anything, may effectively invert the priority order.
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