The Intel 8259 is a programmable interrupt controller (PIC) designed for the Intel 8080 and Intel 8085 microprocessors. The initial part was the 8259; the later 8259A was upward compatible and usable …

The 8259A is fully upward compatible with the Intel 8259. Software originally written for the 8259 will operate the 8259A in all 8259 equivalent modes (MCS-80/85, Non-Buffered, Edge Triggered).

The 8259A Programmable Interrupt Controller handles up to eight vectored priority interrupts for the CPU. It is cascadable for up to 64 vectored priority interrupts without additional circuitry. It is …

May 6, 2023 · Intel 8259 is a Programmable Interrupt Controller (PIC). There are 5 hardware interrupts and 2 hardware interrupts in Intel 8085 and Intel 8086 microprocessors respectively. But by …

Aug 17, 2025 · What does the 8259 PIC do? The 8259 PIC controls the CPU's interrupt mechanism, by accepting several interrupt requests and feeding them to the processor in order.

The Intel 8259 Programmable Interrupt Controller (PIC) is used to manage hardware interrupts in microprocessor-based systems. It’s a key part of traditional x86 architecture and helps prioritize …

The Intel i8259A Programmable Interrupt Controller (PIC), AKA "Legacy PIC", is the IC used as the interrupt controller for the original IBM PC and later variants. Since the PC "AT" model (1983) there …

It is cascadable for up to 64 vectored priority interrupts without additional circuitry. It is packaged in a 28-pin DIP, uses NMOS technology and requires a single +5V supply. Circuitry is static, requiring no …

The 8259 is known as the Programmable Interrupt Controller (PIC) microprocessor. In 8085 and 8086 there are five hardware interrupts and two hardware interrupts respectively.

After initialization, the 8259 Programmable Interrupt Controller is ready to process interrupt requests. However, during operation, it might be necessary to change the mode of processing the interrupts. …