Interrupt Requests Flashcards

1
Q

What are interrupt requests (IRQ)?

A

A hardware signal sent to the processor that temporarily stops a running program and allows a special program, an interrupt handler, to run instead. Interrupts are used to handle such events as data receipt from a modem or network, or a key press or mouse movement.

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2
Q

What is the interrupt request level (IRQL)?

A

The priority of an interrupt request

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3
Q

What are the two types of interrupt requests?

A
Master PIC (0-7)
Slave PIC (8-15)
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4
Q

IRQ 0

A

System timer (cannot be changed)

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5
Q

IRQ 1

A

Keyboard controller (cannot be changed)

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6
Q

IRQ 2

A

Cascaded signals from IRQs 8-15

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7
Q

IRQ 3

A

Serial port controller for serial port 2 (shared with serial port 4 if present)

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8
Q

IRQ 4

A

Serial port controller for serial port 1 (shared with serial port 3 if present)

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9
Q

IRQ 5

A

Parallel port 2 and 3 or sound card

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10
Q

IRQ 6

A

Floppy disk controller

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11
Q

IRQ 7

A

Parallel port 1. It is used for printers or for any parallel port if a printer is not present

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12
Q

IRQ 8

A

Real-time clock

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13
Q

IRQ 9

A

Advanced configuration and power interface system control interrupt on Intel chipsets.
Other chipset manufacturers might use another interrupt request for this purpose.

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14
Q

IRQ 10

A

The interrupt is left open for the use of peripherals. Open interrupt / available or SCSI or NIC

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15
Q

IRQ 11

A

The interrupt is left open for the use of peripherals. Open interrupt / available or SCSI or NIC

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16
Q

IRQ 12

A

Mouse on PS/2 connector

17
Q

IRQ 13

A

CPU co-processor or integrated floating point unit or inter-processor interrupt (use depends on OS)

18
Q

IRQ 14

A

Primary ATA channel

19
Q

IRQ 15

A

Secondary ATA channel