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NCR 53C9x
The NCR 53C9x is a chipset made by the former NCR Corporation for implementing the SCSI protocol. The 53C9x is a low-cost solution and was therefore widely adopted by OEMs in various motherboard and peripheral device designs; however, the chipset lacks many features commonly attributed as beneficial aspects of SCSI interfaces—for example, the 53C9x lacks Direct memory access (DMA) or bus-mastering capability, and therefore drivers for the chipset consume more processor cycles than those for chipsets which implement such features, due to the necessity of programmed IO.
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