8-Port interrupt arbitration logic

The interrupt arbitration logic determines the priority for software service when two or more 8-port or 16-port adapters generate interrupts.

Up to eight 8-port adapters can co-reside and concurrently operate in a system. This logic provides the system with adapter and port identification as well as the interrupt type in a single read operation. After an interrupt request is detected, the system reads the 16-bit interrupt arbitration register, which is located at I/O address 0130.