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Uploaded on Dec 13, 2011
The 8279 Programmable Keyboard/Display Interface & The 8259A programmable Interrupt Controller.
The 8279 is a hardware approach to interfacing a matrix keyboard and a multiplexed display. The 8279 is a 40-pin device with two major segments: keyboard and display. The keyboard segment can be connected to a 64-contact key matrix. Keyboard entries are debounced and stored in the internal FIFO (First-In-First-Out) memory; an interrupt signal is generated with each entry.
The 8259A is a programmable interrupt controller designed to work with Intel microprocessors 8085, 8086, and 8088. 1.The 8259A interrupt controller can manage eight interrupt according to the instructions written into its control registers. This is equivalent to providing eight interrupt pins on the processor in place of one INTR (8085) pin.