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 …

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 …

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).

Jul 23, 2025 · What is 8259? The Programmable Interrupt Controller 8259 is developed by Intel. It is used to manage and control hardware interrupts in a computer system. It enables the CPU to …

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 …

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.

Jun 11, 2025 · The 8259 PIC was first introduced by Intel in the late 1970s as a part of their 8080/8085 microprocessor family. Over the years, it has undergone several revisions and …

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.

The 8259A is a device specifically designed for use in real time, interrupt driven microcomputer systems. It manages eight levels or requests and has built-in features for expandability to other …

Jul 23, 2025 · What is 8259? Intel 8259 is a programmable Interrupt Controller (PIC).By connecting intel 8259 with these microprocessors, we can increase their interrupt input …