Samsung SN-S082D Service Manual - Page 21

5-4. Compatibility Issues and Suggested Actions What is DMA Mode? DAM (Direct Memory Access) allows autonomous transfer of data between the main memory and peripheral devices without CPU intervention which reduces the CPU load for multi-tasking, and increases the transfer speed. - It minimizes the number of interrupts for inputs and outputs during program execution increasing system efficiency. It provides direct exchange of I/O data at high speed between the main memory and peripheral devices without going through the CPU. - In DMA mode, data are transferred directly among peripheral devices without the intervention of CPU. However, DMA mode cannot be selected if the mainboard does not support the DMA mode. In addition, DMA mode cannot be selected if an external connection device is used. - In DMA mode, a number of mainboard using VIA chipsets and some specialized mainboard may have compatibility issues. Check for DMA mode support on your mainboard before using the mode. If the mainboard does not support the DMA mode, then change the mode to PIO mode. DMA Selection Windows98 & WinME Select DMA by clicking Start -> Settings -> Control Panel -> System -> Hardware Wizard -> CD/ROM -> Drive Property -> Select Windows2000 & Windows XP Select DMA by clicking Start -> Settings -> Control Panel -> System -> Hardware -> Hardware Wizard -> IDE ATA / ATAPI Controller -> Secondary IDE Cable Controller Property -> Advanced The DMA selection procedure may vary depending upon the OS environment. Verify that the DMA selection has been performed correctly after the selection process. 19