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    8259 evaluates the request and sends INT to CPU. CPU sends INTA-bar. Highest priority ISR is set. IRR is reset.
    Fig below shows the internal block diagram of the 8259A. It includes eight blocks: data bus buffer, read/write logic, control logic, three registers
    The Intel 8259A Programmable Interrupt Controller handles up to eight vectored priority interrupts for the . When the 8259A PIC receives an interrupt INT be-.The block diagram of 8259 is shown in the figure below: enter image description here. It contains following blocks-. Data bus buffer-. It is used
    4 Jan 2019 Intel 8259A Programmable Interrupt Controller In the Intel family PIC 8259, A is a remarkable PIC which is to be noted. Comments Edit
    The Intel 8259 is a Programmable Interrupt Controller (PIC) designed for the Intel 8085 and Intel 8086 microprocessors. The initial part was 8259, a later A suffix
    8259 microprocessor is defined as Programmable Interrupt Controller (PIC) microprocessor. There are 5 hardware interrupts and 2 hardware interrupts in 8085
    17 Apr 2014 8259A is treated as peripheral in a microcomputer system. 6. 8259A PIC adds eight vectored priority encoded interrupts to the microprocessor.
    4 Apr 2018
    The 8259A is a programmable interrupt controller specially designed to work . The 8259A (PIC) has eight interrupt request inputs – IR7 – IR0. The 8259A uses


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