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EISA Interrupts
The EISA bus supports 11 edge-triggerable or level-triggerable interrupts. IRQ0-IRQ2, IRQ8, and IRQ13 are reserved for internal functions and are not available to EISA cards. The remaining 11 interrupt lines (IRQ3-IRQ7, IRQ9-IRQ12, IRQ14, IRQ15) can be generated by EISA cards. Multiple cards can use one IRQ level, so long as they use the same triggering method.
All EISA-generated interrupts are transmitted to a single interrupt level on the Silicon Graphics CPU (see "Interrupt Priority Scheduling".)
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