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Irq dma err

\015 IRQ, DMA, and other Computer Creatures\015

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IRQ's (Interrupt Request) LinesIRQ's are hotlines to the main computer (CPU) that allow devices connected to the computer to signal the CPU that they need immediate attention. If you're a Batman fan, think of IRQ's as the Batphone - getting his attention immediately. 
Not all devices require IRQ lines, which is good news because in modern (post IBM XT) computers, we only have 16 of them. Of those, 3 are already dedicated to the main system board itself - the system timer, keyboard, and memory parity error signal. That leaves only 13 for all the other devices connected to your computer. This is why IRQ conflicts are probably the #1 problem faced by computer users when they add hardware to their computer.\011 


 

Its a general rule for ISA-type systems (the standard computer architecture used in most IBM compatible systems) that IRQ lines CANNOT by shared with multiple devices except under special circumstances. For this reason, a good understanding of what IRQ's are assigned to what devices is essential in avoiding conflicts. The table below is a general outline for standard IRQ assignments.IRQ\011DEVICE USED in AT, 386, 486, and Pentium Computers
0\011System Timer
1\011Keyboard Controller
2\011Tied to IRQs 8-15
3\011COM 2
4\011COM 1
5\011LPT2 or Sound Card
6\011Floppy Diskette Controller
7\011LPT 1
8\011Real Time Clock
9\011Substitutes for IRQ 2
10\011Not Assigned
11\011Not Assigned
12\011PS/2 Mouse Port
13\011NPU (Numerical Processing Unit)
14\011Primary Hard Disk Controller
15\011Secondary Hard Disk Controller


Depending on the computer's configuration, add-in devices such as SCSI controllers, sound cards, modems, cd-roms, etc. will want an IRQ line that is already used by another device, and thus we have what is commonly referred to as an IRQ Conflict. 

The most common IRQ conflicts seem to be between two COM ports, generally a mouse and modem conflict that ends up freezing the mouse whenever the modem is activated. The table below explains each IRQ and the most common devices each may use.

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Irq dma err


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