When running at a specific level, only higher priority interrupts were allowed.
2.
The priority interrupt system allows 2 38 input / output interrupts and up to 896 system interrupts.
3.
The "'priority interrupt feature "'added thirty-two interrupt levels to the standard five.
4.
System software can use the TPR register to temporarily block low-priority interrupts from interrupting a high-priority task.
5.
This is accomplished by loading TPR with a value corresponding to the highest-priority interrupt that is to be blocked.
6.
The 980 was, for its time, a relatively powerful small computer that offered memory protection and multiple-priority interrupt capabilities.
7.
Should a high priority interrupt occur when a portion of the store is complete, the operation must be completed when the interrupt level is returned.
8.
The interrupts were numbered from 0 ( highest priority ) to 31 ( lowest ); a higher priority interrupt could interrupt processing of a lower priority.
9.
An ( unusual ) FLIH which unmasks its associated interrupt before it completes is called a priority interrupt system, the FLIH also ( briefly ) masks other interrupts of equal or lesser priority.
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