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Written by Site-Administrator
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Sunday, 21 December 2008 11:47 |
IRQ Assignments0 System Timer 1 Keyboard 2 IRQ Cascade to 9 3 COM2 / COM4 (Modem, if present) 4 COM1 / COM3 (Serial mouse, if present) 5 SoundBlaster style sound cards, LPT2 if present 6 Floppy disk controller 7 LPT 1 8 Real Time Clock 9 ACPI controller, SCSI adapter, Video adapter Substitutes for IRQ 2 10 USB Controller, sometimes Ethernet 11 Usually PCMCIA slot devices, sometimes Ethernet 12 PS/2 Mouse 13 Math Co-Processor 14 IDE Primary Controller 15 IDE Secondary Controller DMA Assignments0 Available (Sometimes used by Soundcard) 1 Available 2 Floppy Drive 3 ECP LPT Port 4 DMA Cascade Controller 5 Available (Sometimes used by Soundcard) 6 Available (Sometimes used by LT Win modem) 7 Available (Sometimes used by LT Win modem)
I/O Addresses Within the computer's memory map, certain memory addresses are generally used for certain things. Listed below you will see the common I/O addresses with problems, and what hardware should be assigned to what address. These addresses are in hexadecimal format.
I/O Address | Common Device using Address | 130h | Used for SCSI host adapters | 140h | Used for SCSI host adapters | 170h | Secondary IDE Interface | 1F0h | Primary IDE Interface | 220h | Typically used for Sound Blaster-type sound cards | 240h | An alternate address for sound cards | 278h | Assigned to LPT2 or LPT3 and generally used with IRQ 5 | 280h | Network Interface cards or the Aria Synthesizer | 2A0h | An alternate address for NIC cards or the Aria Synthesizer | 2E8h | Assigned to COM 4 and used with IRQ 3 | 2F8h | Assigned to COM 2 and used with IRQ 3 | 300h | Another Network Interface Card choice | 320h | A good place for a Network card, unless there is a SCSI host adapter or MIDI device | 330h | A common place for the SCSI host adapters | 340h | Another good alternative for the SCSI host adapter | 360h | A Network card choice, but beware of the first parallel printer port, this could be a conflict. | 378h | The first parallel printer port (LPT 1) in color systems, commonly used with IRQ 7. | 3BCh | The first parallel printer port (LPT1) in monochrome systems, beware you may have problem assigning this address to a printer port in Windows 95. | 3E8h | Assigned to COM 3 and used with IRQ 4 | 3F8h | Assigned to COM 1 and used with IRQ 4 |
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After the installation of most hardware, if the system starts to freeze or the additional device does not operate properly, it’s probably caused by a conflict with the IRQ, DMA, or I/O address regions of the new card. With a thorough understanding of which devices use which system resources, generally a solution can be worked out to allow the new device to work properly.
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Last Updated on Friday, 26 December 2008 20:16 |
IRQ Assignments
