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IRQs 3 is reserved for the COM1 port.

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Q: What is IRQ 3 used for?
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Related questions

What IRQ does COM2 use?

IRQ 3.


What is the address of COM1?

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


What is the IRQ for a keyboard?

IRQ 1 is used exclusively for the keyboard controller.


What IRQ is used by the mouse?

i dont know the answer


What IRQ is used by moused?

i dont know the answer


List interrupts used with the IBM PC type sytems?

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


What system resources does COM2 use?

IRQ 3


IRQ address typically used for LPT2?

5


What system resources does com1 use com2 com2 com3 com4?

COM1-IRQ 4, memory addresses 03F8-03FF COM2-IRQ 3, memory addresses 02F8-02FF COM3-IRQ 4, memory addresses 03E8-03EF COM4-IRQ 3, memory addresses 02E8-02EF pg. 396


If IRQ 2 is in use IRQ 9 cant be used?

Depends if it's sharable or not. You could try moving the card to another slot.


Which interrupt is usually used for the System Timer?

IRQ 0


What is irq3 used for?

IRQ Interrupt Request 3 are usually reserved for COM port (1,2,3,4) but can be assigned to anything.Interrupts are a commonly used technique for computer multitasking, especially in real-time computing. Such a system is said to be interrupt-driven.An act of interrupting is referred to as an interrupt request (IRQ