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Encyclopedia > 8259

8259A is the original interrupt controller used in the IBM PC, the very first PC, it is a PIC, or programmable interrupt controller.


  Results from FactBites:
 
Intel 8259 - Wikipedia, the free encyclopedia (1152 words)
The Intel 8259 is a family of Programmable Interrupt Controllers (PICs) designed and developed for use with the Intel 8085 and Intel 8086 8-bit and 16-bit microprocessors.
The 8259 was included in the original PC introduced in 1980 and maintained by the PC/XT when introduced in 1983.
The 8259, though originally a separate chip, is now part of the Southbridge chipset on modern x86 motherboards.
8259 (677 words)
8259 IRQ signal is raised high by hardware setting the corresponding IRR bits true.
These can be written to the 8259 anytime after initialization.
- The 8259 differentiates between the OCW1, OCW2 and OCW3 by the port address and the value of the data bits D4 and D3.
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