FEATURES OF 8259:
1. It is programmed to work with either 8085 or 8086 processor.
2. It manage 8-interrupts according to the instructions written into its control registers.
3. In 8086 processor, it supplies the type number of the interrupt and the type number is programmable. In 8085 processor, the interrupt vector address is programmable. The priorities of the interrupts are programmable.
4. The interrupts can be masked or unmasked individually.
5. The 8259s can be cascaded to accept a maximum of 64 interrupts.
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