Question

What is 8259 programmable interrupt controller?

Answer 1

The Intel 8259 is a Programmable Interrupt Controller (PIC) designed for the Intel 8085 and Intel 8086microprocessors. The initial part was 8259, a later A suffix version was upward compatible and usable with the 8086 or 8088 processor. The 8259 combines multiple interrupt input sources into a single interrupt output to the host microprocessor, extending the interrupt levels available in a system beyond the one or two levels found on the processor chip. The 8259A was the interrupt controller for the ISA bus in the original IBM PC and IBM PC AT.

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Answer 2

HEY FRND
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its

8259 Programmable Interrupt Controller.

Features: It is a LSI chip which manages 8 levels of interrupts i.e. it is used to implement 8 level interrupt systems.

It can be cascade in a master slave configuration, which works up to 64 levels of interrupt.

It can identify the interrupted device.

It can solve the requests in the middle of the intermediate, that is, it does not require any external priority resolver.

It can be operated in different priority mode such as fixed priority and rotation priority.

It provides 8 bit vector number as an interrupt information.
It does not require clock signal.
It can be used in polled as well as interrupt modes.
The starting address of vector number is programmable.
It can be used in buffered mode.

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