IRQs & hardware


































Una interrupción se convierte en una interrupción de hardware cuando es solicitada por uno de los componentes de hardware delequipo.

Los periféricos cuentan con un número de interrupción que se denomina IRQ (Peticiones de Interrupción. Es como si cada periférico tirara de un "hilo" que está atado a una campana para señalarleal equipo que desea que le preste atención.







Configuración
IRQ
Bus Line?

Priority
Typical
Default Use
Other Common Uses

0
no
1
System timer
None
1
no
2
Keyboardcontroller
None
2
no (rerouted)

N/A
None; cascade for IRQs 8-15. Replaced by IRQ 9
Modems, very old (EGA) video cards, COM3 (third serial port), COM4 (fourth serial port)
3
8/16-bit

11
COM2(second serial port)

COM4 (fourth serial port), modems, sound cards, network cards, tape accelerator cards
4
8/16-bit

12
COM1 (first serial port)

COM3 (third serial port), modems, soundcards, network cards, tape accelerator cards
5
8/16-bit

13
Sound card

LPT2 (second parallel port), LPT3 (third parallel port), COM3 (third serial port), COM4 (fourth serial port), modems, networkcards, tape accelerator cards, hard disk controller on old PC/XT
6
8/16-bit
14
Floppy disk controller
Tape accelerator cards
7
8/16-bit

15
LPT1 (first parallel port)

LPT2 (secondparallel port), COM3 (third serial port), COM4 (fourth serial port), modems, sound cards, network cards, tape accelerator cards
8
no
3
Real-time clock
None
9
16-bit only

4

Network cards, soundcards, SCSI host adapters, PCI devices, rerouted IRQ2 devices
10
16-bit only

5

Network cards, sound cards, SCSI host adapters, secondary IDE channel, quaternary IDE channel, PCI devices
1116-bit only

6

Network cards, sound cards, SCSI host adapters, VGA video cards, tertiary IDE channel, quaternary IDE channel, PCI devices
12
16-bit only

7
PS/2 mouse

Network cards, sound...