'8259a' presentation slideshows

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??? ???????. Interrupt and Interrupt Applications. ????. ?? ??????? 80x86 ??? ????? ??????? ???? 8259A ???????? 8259A ?? 8259A ??? ?? 8259A ??? ??? 8259A ?????. ???? ( ? ). 8259A ????????? ?????? (ICWs) ??????? (OCWs) 8259A ?? ?? 8259A ?? ??? 8259A ????. ??.

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Computer Buses

Computer Buses. A bus is a common electrical pathway between multiple devices. Can be internal to the CPU to transport data to and from the ALU. Can be external to the CPU, to connect it to memory or to I/O devices. Early PCs had a single external bus or system bus .

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? 9 ? ???????? 8259A. ????? ? 1 ?????? 8 ?????????????????? 64 ???????? ? 2 ??????????????? ? 3 ??? CPU ????????????????? ? 4 ???????????????????????????? ? 5 ????????????. 9.3.1 8259A ????????. 1. ???? ? 8 ???????? 9-6 ? 1 ? 8 ????????? IRR ??????????????????? IR0~IR7 ??

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8259A PRIORITY INTERRUPT CONTROLLER

8259A PRIORITY INTERRUPT CONTROLLER. 8086 has 2 interrupt inputs 1. NMI 2. INTR

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