1)What are "masks"?
2)What is an IRQ mask? And how can I use it?
3)What is a NMI mask? And how can I use it?
4)What is a "palette"? How to interpret its numbers?
5)What are "ports" (accessed by IN and OUT instructions)
and why are they so important?
6)How can I reach a "port"?
Thanx for the help.
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