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Want to know applications of DMA in real time

How and by what mechanism is DMA used in peripheral device drivers as well as functionalities such as network packet routing, audio playback and streaming video.

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Re: want to know applications of DMA in real time


Now a days DMA is replaced with  Bus Mastering technology , but still some sound chips use DMA to increase the Audio performance

DMA is a kind of technology where the data transfer is controlled by a chip other than CPU thus freeing cpu for other tasks.

When you request data from a high speed pheripheral for reading or writing , an Interrupt is generated by the pheripheral to alert the CPU , CPU then service the ISR ( Interrupt service routine) to perform the task , DMA plays its role here , it taks control from CPU for further data transfers over a bus , and act as a second cpu and monitor the data transfers.

Posted on Nov 20, 2007

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Re: want to know applications of DMA in real time

Good Morning
IT it a little "brige" to some sound aplications or routing signal to Printers or Sound Cards, but not for Network. Not good sometimes for Sound Cards, but you can play sometimes with settings and see what happend, you always can go back the DMA at previuos state, or simple, disable.

Posted on Nov 18, 2007

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Am looking for sound drivers for dell 520

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If your older PC has lost some zip -- An easy thing to check & fix.

After a while, usually several years, your hard disks wear. As this happens the disks will have errors. Windows keeps track of these errors and if they grow too numerous Widows will take actions designed to reduce the possibility of a catastrophic event. One thing it will do is change the method it uses to access the hard disk. It will change from DMA mode to PIO mode and slow you way down. This tip will restore DMA mode so you can get a little more use out of your aging system. You won't need any disks or special software, but you will have to reboot twice.

In Windows get to Device Manager.

One way to get there is click Start, right click My Computer, select Properties, click Hardware tab, click Device Manager button.

In Device Manager, press the + next to IDE ATA/ATAPI controllers.

It should look something like this:


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Click the Driver tab.


Click the Uninstall button. Click the OK button. Do this for all IDE Controllers that show PIO mode.

Windows will ask if you want to reboot. Let it happen. Windows will reboot, load the DMA drivers, and tell you it has to reboot again. Let it happen.

Now the DMA drivers should have been installed and some of the snap should return to your PC.

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on Sep 21, 2010 | PC Desktops


What are drivers?

Drivers are small software programs that help control devices attached to your computer because drivers enable your operating system and other software to communicate with various hardware devices, controllers, and other peripherals. In other words, drivers work as instruction manuals that provide software with the information with regard to controlling and communicating with different hardware devices.
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1 Answer

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Computer Repair Services

Computer repair includes software and hardware repair. Hardware repair is needed when any part of the computer is not functioning as expected. Software repair is required when any software program is not executing properly.

Need of computer repair

Computer repair is needed for making your computer function properly. Your computer will function properly if all its parts are working properly. Some of the issues for which you require computer repair are as follows:

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The reason for most of the computer issues is the lack of maintenance. For maintaining your computer and optimizing its performance, you have to update software regularly, clean registry, empty cache files and many others.

In case, you have the knowledge about how to repair your computer, you can perform it yourself. But if you do not have any knowledge in this field, then you can contact a computer support technician.

Computer repair technician is a person who will repair your computer either through online or on-site. Online computer repair is preferred in case your computer needs software repair. If you want to go for online computer repair, all you need to have is an Internet connection. Online computer repair saves your from the pain of taking your computer to some technical services center or inviting some technician at your own residence.

These days most of the companies offering online computer repair adopt the method of remote desktop connection. Technician will access your computer with the use of software made for remote desktop connection. But you have to give him permission for doing so. After getting permission, he will diagnose your problem and after that resolve it. Technician will install, reinstall or uninstall any software, or modify some of the settings for resolving issues.

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on Feb 04, 2010 | PC Desktops

1 Answer

What is peripheral device? and 2 eg. of peripheral in a computer system

Peripheral devise are the computer devices that are connected to the computer externally such as printer, scanner, keyboard, mouse, tape device, microphone and external modem. They can be internal such as CD-ROM or internal modem and external as the scanner, printer and Zip drive. Peripheral devices can be classified according to their functions.

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Hope this will be helpful to you.

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1 Answer

Irq dma err

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.  


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 DEVICE USED in AT, 386, 486, and Pentium Computers
0 System Timer
1 Keyboard Controller
2 Tied to IRQs 8-15
3 COM 2
4 COM 1
5 LPT2 or Sound Card
6 Floppy Diskette Controller
7 LPT 1
8 Real Time Clock
9 Substitutes for IRQ 2
10 Not Assigned
11 Not Assigned
12 PS/2 Mouse Port
13 NPU (Numerical Processing Unit)
14 Primary Hard Disk Controller
15 Secondary 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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Audio and video track are not in sync

I guess that your CDROM Device doesn't have DMA (Direct Memory Access) enabled.

From the Microsoft Knowledge Base Article:

To enable DMA mode using the Device Manager


Open Device Manager.


Double-click IDE ATA/ATAPI Controllers to display the list of controllers and channels.


Right-click the icon for the channel to which the device is connected, select Properties, and then click the Advanced Settings tab.


In the Current Transfer Mode drop-down box, select DMA if Available if the current setting is "PIO Only."
If the drop-down box already shows "DMA if Available" but the current transfer mode is PIO, then the user must toggle the settings. That is:

Change the selection from "DMA if available" to PIO only, and click OK.

Then repeat the steps above to change the selection to DMA if Available.

Oct 14, 2007 | PC Desktops

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