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.
network interface cards
This interrupt is the first choice that most sound cards make when looking for an IRQ setting.
On a notebook, an ExpressCard slot will allow you to read flash memory cards. This interface was formerly known as a NEWCARD.
The default IRQ for COM2 is typically 3, while for COM4, it is usually 5. These IRQ settings allow the operating system to manage hardware interrupts for the respective serial ports. However, these values can sometimes vary based on the system configuration and settings in the BIOS. Always check your specific system documentation for accurate IRQ assignments.
LTP1 should use IRQ7.
Windows 2000 and on used IRQ sharing because the OS would allow more and more hardware. There is a set number of IRQs (15 or 16).
By default, the IRQ for the floppy disk controller is IRQ 6.
By default IRQ 7 is assigned to LPT1.
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
IRQ 1 is used exclusively for the keyboard controller.
IRQ 1
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