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8259 Interrupt Controller OCW2 register

Hi all,

I am trying to figure out how an 8259 OCW2 register behaves, more specifically if the "Automatic Rotation" bits of OCW2 are latched or not.

For example, if I want to automatically rotate interrupt priorities on a Non-Specific EOI, do I

a) Issue a "Rotate on non-specific EOI command" to OCW2 during initialisation and then issue a Non-Specific EOI at the end of my ISR.

or

b) I issue a "Rotate on non-specific EOI command" at the end of my ISR.

Thanks Hans.

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