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Hardware Comm Port and IRQ Chart |
Hardware Comm @ IRQ Chart
Where to change
Interrupt settings (IRQs)
COMMON HARDWARE NEEDS
COM1 3F8-3FF Irq 4
COM2 2F8-2FF Irq 3
COM3 3E8-3EF Irq 4
COM4 2E8-2EF Irq 3
STANDARD IRQ ASSIGNMENTS
INTERRUPT CONTROLLER 1
IRQ 0 Timer Output / System Timer
IRQ 1 Keyboard Controller
IRQ 2 Route to Interrupt Controller2 , IRQ 8
IRQ 3 COM2 or COM4 / Modem
IRQ 4 COM1 or COM3
IRQ 5 LPT1 or LPT2 or Network card or Sound card
IRQ 6 Floppy Disk Controller
IRQ 7 LPT1 or LPT2 or Network card or Sound card
INTERRUPT CONTROLLER 2
(AT Only)
IRQ 8 Real Time Clock
IRQ 9 Software Redirect to IRQ 2, Midi interrupt
IRQ 10 Available
IRQ 11 Available
IRQ 12 Available
IRQ 13 Math Coprocessor
IRQ 14 Primary IDE Hard Disk Controller
IRQ 15 Secondary IDE Hard Disk Controller / Available
IRQ PRIORITIES
HIGHEST
0
1
2/9
10
11
12
13
14
15
3
4
5
6
7
8
LOWEST
Where to change Interrupt settings (IRQs)
Windows 95 assigns IRQs automatically, but if you need to change them to
a specific value, you can.
1. Click the Start button, point to Settings, then click Control Panel.
2. Double-click the System icon.
3. Select the Device Manager tab, then find and double-click on the
device you want to change the IRQ for.
4. A panel for that device will appear. If you select the Resources
tab, a Resources Settings window will pop up. One of the choices in the
window is Interrupt Request with the current value listed.
If you click on that to highlight it, the change setting button will
become usable.
If you click on that button, you will get the Edit Interrupt Request
panel that will allow you to change the interrupt, and will immediately
tell you if your new choice conflicts with other equipment.
Note: For some Devices you will first have to push the "Set Configuration
Manually" button, and un check the "Use Automatic