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The 8259 may be configured to work with an 8080/8085 or an 8086/8088. On the 8086/8088, the interrupt controller will provide an interrupt number on the data bus when an interrupt occurs. The interrupt cycle of the 8080/8085 will issue three bytes on the data bus (corresponding to a CALL instruction in the 8080/8085 instruction set).
In computing, a programmable interrupt controller (PIC) is an integrated circuit that helps a microprocessor (or CPU) handle interrupt requests (IRQs) coming from multiple different sources (like external I/O devices) which may occur simultaneously. [1]
Interrupt lines are often identified by an index with the format of IRQ followed by a number. For example, on the Intel 8259 family of programmable interrupt controllers (PICs) there are eight interrupt inputs commonly referred to as IRQ0 through IRQ7.
Hardware interrupt vector numbers correspond to the hardware IRQ numbers. The exact mapping depends on how the Programmable Interrupt Controller such as Intel 8259 is programmed. [2] While Intel documents IRQs 0-7 to be mapped to vectors 0x20-0x27, IBM PC and compatibles map them to 0x08-0x0F. IRQs 8-15 are usually mapped to vectors 0x70-0x77.
In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of programmable interrupt controllers. As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems. It is one of several architectural designs ...
82380 - High Performance 32-Bit DMA Controller with Integrated System Support Peripherals. This chipset has 20-level programmable interrupt controller a superset of Intel's 82C59 PIC. It also has four (x4) 16-bit programmable internal timers which its superset Intel's 82C54 PIT. It also has built-in DRAM refresh controller as well.
An end of interrupt (EOI) is a computing signal sent to a programmable interrupt controller (PIC) to indicate the completion of interrupt processing for a given interrupt. Interrupts are used to facilitate hardware signals sent to the processor that temporarily stop a running program and allow a special program, an interrupt handler, to run ...
8259 – Programmable Interrupt Controller; 8271 – Programmable Floppy Disk Controller; 8272 – Single/Double Density Floppy Disk Controller. It is compatible with IBM 3740 and System 34 formats and provides both Frequency Modulation (FM) or Modified Frequency Modulation (MFM). This version was available for US$38.10 in quantities of 100 ...