Acc.#1990.0505 NCR Collection SCSI

NCR SCSI Chip Page 4 of 9

WHY USE SCSI?
NCR Corporation and Shugart Associates changed the face of computing by developing Small Computer System Interface (SCSI) technology. Before SCSI, adding a new peripheral to a host computer meant "teaching" the host to work with the new peripheral by adding new hardware and/or software modules. By the time the host computer "learned" how to work with the new peripheral, more advanced peripherals were available, and the host computer was unable to take advantage of them. No matter how much development effort was spent, the peripherals that could be used on a host system were usually at least a generation behind current technology. SCSI is designed to keep computers in step with advancing technologies. SCSI enables host computers to connect with virtually any peripheral device -- even those just off the drawing board -- without always having to overhaul system hardware and/or software. The host computer does not have to "learn" a new way to communicate every time a peripheral device is added. SCSI works by masking the internal structure of the peripherals from the host computer. It uses an eight-port bus that can accommodate either single- or multiple-host systems. Its impressive transfer rate of up to 5 Mbytes per second allows direct copying between devices. This frees the host for additional activity, and also gives the host power for considerable I/O data transfers. SCSI gives original equipment manufacturers (OEMs) , systems integrators, and value-added-resellers (VARs) a cost-effective way to personalize product offerings without sacrificing compatibility. Equally important is the upward mobility provided by the SCSI I/O bus. As new storage, printing, and communications technologies move into the mainstream of systems design, integrators can quickly incorporate them into their existing systems with only minimal hardware engineering and software development. (From What is SCSI? Understandinq the Small Computer System Interface, NCR Corporation, 1988.)

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