what is 8259 Programmable Interrupt Controller Pin Diagram?

8259 microprocessor is defined as Programmable Interrupt Controller (PIC) microprocessor. There are 5 hardware interrupts and 2 hardware interrupts in 8085 and 8086 respectively. But by connecting 8259 with CPU, we can increase the interrupt handling capability. 8259 combines the multi interrupt input sources into a single interrupt output. Interfacing of single PIC provides 8 interrupts inputs from IR0-IR7.

​

you can also watch the below video for more details........

​

https://www.youtube.com/watch?v=0xva-pmr9FA&feature=youtu.be