IO 8-15 are bank 2. These chips have two different interrupt outputs:
One for bank 1 and another for bank 2. If irq-mirror is set, both
interrupts are generated regardless of the bank that an input change
- occured on. If it is not set, the interrupt are only generated for the
+ occurred on. If it is not set, the interrupt are only generated for the
bank they belong to.
On devices with only one interrupt output this property is useless.