IRQ stands for Interrupt Request, which is a direct line to the Microprocessor and tells the Microprocessor to stop what it is doing and wait until it has further instructions. Every PC computer has a maximum of 15 IRQs that are prioritized according to the importance of the device.
IRQ stands for Interrupt Request.
The default IRQ for LPT2 is IRQ 5.
By default, the IRQ for the floppy disk controller is IRQ 6.
The PCI devices must all share at least one IRQ; ALL devices need an IRQ to be functional. XP and Vista will automatically assign all PCI devices to a single IRQ (IRQ 9) whenever possible.
IRQ 0 - System timer. IRQ 1 - Keyboard. IRQ 2 - Cascaded signals from IRQs 8-15. IRQ 3 - COM2 (Default) and COM4 (User) serial ports IRQ 4 - COM1 (Default) and COM3 (User) serial ports IRQ 5 - LPT2 Parallel Port 2 or sound card IRQ 6 - Floppy disk controller IRQ 7 - LPT1 Parallel Port 1 or sound card (8-bit Sound Blaster and compatibles) IRQ 8 - Real time clock IRQ 9 - Free / Open interrupt / Available / SCSI. Any devices configured to use IRQ 2 will actually be using IRQ 9. IRQ 10 - Free IRQ 11 - Free IRQ 12 - PS/2 connector Mouse. IRQ 13 - ISA / Math Co-Processor IRQ 14 - Primary IDE. If no Primary IDE this can be changed IRQ 15 - Secondary IDE These are just a set of standard IRQs. For much more detail check our Ralf Brown's list located at http://www.cs.cmu.edu/~ralf/files.html
IRQ 1 is used exclusively for the keyboard controller.
a sound card uses IRQ 5
IRQ Ports 2 & 9 -Taylor
By default IRQ 7 is assigned to LPT1.
What is the standard IRQ setting for a math coprocessor?
From: http://www.techadvice.com/tech/C/ComPort_TS.htmCom1, IRQ 4, address: 3F8Com2, IRQ 3, address: 2F8Com3, IRQ 4, address: 3E8Com4, IRQ 3, address: 2E8
None. Its the graphics card that uses an IRQ. The monitor is just a peripheral.
See the Related Links for the source of this answer.Com1, IRQ 4, address: 3F8Com2, IRQ 3, address: 2F8Com3, IRQ 4, address: 3E8Com4, IRQ 3, address: 2E8
This interrupt is the first choice that most sound cards make when looking for an IRQ setting.
IRQ or interupt request : An IRQ allows a device to request certain system resources on priority. Normally, the system allowcates the different non-competing IRQ numbers to different devices. The system allocated IRQs may some times be manually changed. However, it may lead to serious IRQ conflicts resulting in a hung operating system.
IRQ 1 is used for the standard plugged keyboard. USB and Wireless will use variable IRQ's
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