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The signal requests permission from
The signal requests permission from the CPU to send the character on. The PIC notifies the keyboard controller
when the way is clear to the CPU, and then the byte is moved onto the I/O bus. At the physical level, an IRQ is a
printed track on the bus. The printed track connects to all the PCI slots on the motherboard, so no matter which
slot the adapter is installed in it has contact with the IRQ system.
8 or 15 IRQ lines
In the original PC architecture, an 8259 Programmable Interrupt Controller was used on the motherboard. It could
handle 8 IRQ lines. This was later extended to two controllers with a total of 15 lines (one of the lines is used to
connect the two PIC’s). That means there are 15 IRQ’s available to I/O devices. They are used for several tasks.
Certain system devices, such as the FPU (the number cruncher discussed earlier, and the system clock, each lay
claim to one IRQ. Five of the IRQ’s are reserved for internal system devices like these. In Fig. 179 these are, for example, IRQ numbers 0, 8 and 13.
when the way is clear to the CPU, and then the byte is moved onto the I/O bus. At the physical level, an IRQ is a
printed track on the bus. The printed track connects to all the PCI slots on the motherboard, so no matter which
slot the adapter is installed in it has contact with the IRQ system.
8 or 15 IRQ lines
In the original PC architecture, an 8259 Programmable Interrupt Controller was used on the motherboard. It could
handle 8 IRQ lines. This was later extended to two controllers with a total of 15 lines (one of the lines is used to
connect the two PIC’s). That means there are 15 IRQ’s available to I/O devices. They are used for several tasks.
Certain system devices, such as the FPU (the number cruncher discussed earlier, and the system clock, each lay
claim to one IRQ. Five of the IRQ’s are reserved for internal system devices like these. In Fig. 179 these are, for example, IRQ numbers 0, 8 and 13.
0/5000
Tín hiệu yêu cầu sự cho phép từ CPU cho các ký tự. PIC thông báo cho bộ điều khiển bàn phím Khi đường là rõ ràng với CPU, và sau đó các byte được di chuyển lên/o xe buýt. Ở cấp vật lý, một IRQ là một in theo dõi trên xe buýt. Theo dõi in kết nối với tất cả các khe cắm PCI trên bo mạch chủ, vì vậy không quan trọng mà khe cắm các bộ chuyển đổi được cài đặt trong đó có tiếp xúc với hệ thống IRQ. 8 hoặc 15 IRQ dòngKiến trúc PC gốc, một 8259 hệ thống ngắt điều khiển được sử dụng trên bo mạch chủ. Nó có thể xử lý 8 IRQ dòng. Điều này sau đó được mở rộng để hai bộ điều khiển với tổng số 15 dây chuyền (một trong những dòng được sử dụng để kết nối hai của PIC). Đó có nghĩa là có là 15 IRQ là có sẵn cho I/O thiết bị. Chúng được sử dụng cho một số nhiệm vụ. Thiết bị hệ thống nhất định, chẳng hạn như FPU (cruncher số thảo luận trước đó, và đồng hồ hệ thống, mỗi lay yêu cầu bồi thường để một IRQ. Năm trong số các IRQ được dành riêng cho hệ thống nội bộ thiết bị như thế này. Trong hình 179 đây là, ví dụ, IRQ số 0, 8 và 13.
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The signal requests permission from the CPU to send the character on. The PIC notifies the keyboard controller
when the way is clear to the CPU, and then the byte is moved onto the I/O bus. At the physical level, an IRQ is a
printed track on the bus. The printed track connects to all the PCI slots on the motherboard, so no matter which
slot the adapter is installed in it has contact with the IRQ system.
8 or 15 IRQ lines
In the original PC architecture, an 8259 Programmable Interrupt Controller was used on the motherboard. It could
handle 8 IRQ lines. This was later extended to two controllers with a total of 15 lines (one of the lines is used to
connect the two PIC’s). That means there are 15 IRQ’s available to I/O devices. They are used for several tasks.
Certain system devices, such as the FPU (the number cruncher discussed earlier, and the system clock, each lay
claim to one IRQ. Five of the IRQ’s are reserved for internal system devices like these. In Fig. 179 these are, for example, IRQ numbers 0, 8 and 13.
when the way is clear to the CPU, and then the byte is moved onto the I/O bus. At the physical level, an IRQ is a
printed track on the bus. The printed track connects to all the PCI slots on the motherboard, so no matter which
slot the adapter is installed in it has contact with the IRQ system.
8 or 15 IRQ lines
In the original PC architecture, an 8259 Programmable Interrupt Controller was used on the motherboard. It could
handle 8 IRQ lines. This was later extended to two controllers with a total of 15 lines (one of the lines is used to
connect the two PIC’s). That means there are 15 IRQ’s available to I/O devices. They are used for several tasks.
Certain system devices, such as the FPU (the number cruncher discussed earlier, and the system clock, each lay
claim to one IRQ. Five of the IRQ’s are reserved for internal system devices like these. In Fig. 179 these are, for example, IRQ numbers 0, 8 and 13.
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