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AST RESEARCH TECHNICAL BULLETIN TB-0140 1-15-86
FOURPORT/XN
Two FOURPORT/XN boards cannot share the same interrupt. Due to
current hardware and software designs, when two FOUR PORT/XN
boards share the same IRQ, the boards's IRQ drivers conflict with
each other. As a result, the interrupt request may not be seen
by the IRQ controller and, therefore, may never be serviced by
the processor.