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The Intel 8259A Programmable Interrupt Controller is used to manage interupts from various sources, source as the hard disk, the floppy disk, the communications ports, the keyboard, the real-time clock, etc., and provide interrupt vectors as specified by the program. Originally designed for the 8086, in 8086 mode it works with the 8086/8088 and its functionality is included in most South Bridge chipsets today.

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