The NCR 53C9x is a family of application-specific integrated circuits (ASIC) produced by the former NCR Corporation for implementing the SCSI protocol in hardware. The 53C9x is a low-cost solution and was therefore widely adopted by OEMs in various motherboard and peripheral device designs. The original 53C90 lacked direct memory access (DMA) capability, an omission that was addressed in the 53C90A and later in the 53C94 and 53C96 versions.
The 53C90(A) supported the SCSI-1 protocol and implemented the eight bit bus. The 53C94 supported SCSI-2 features, as well as SCSI-1, and the 53c96 added support for the high voltage differential (HVD) bus.
QLogic FAS216 and Emulex ESP100 chips are a drop-in replacement for the NCR 53C94. The 53C90A and 53C94/96 were also produced under license by Advanced Micro Devices (AMD).
A list of systems which include the 53C9x chipset includes:
53C94
53C96
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