SCSI adapter
Small computer system interface (SCSI) is a set of standard electronic interfaces that allow personal computers to communicate with peripheral hardware such as disk drives, tape drives, CD-ROM drives, printers scanners faster and more flexibly than previous interfaces. The Small Computer System Interface (SCSI) defines an input/output bus and logical interfaces supporting the bus of interconnecting computer and peripheral devices. Small computer system interface (SCSI) allows for the connection of up to fifteen peripheral devices to a single controller called a "SCSI host adapter" of a computer device. SCSI peripherals are daisy chained together using a second port to connect each device to the next device in line. In addition to faster data rates, SCSI is more flexible than earlier parallel data transfer interfaces. The SCSI standard can transfer data at up to 80 megabytes per second (MBps). SCSI allows for the connection of multiple devices to a single SCSI host adapter. Typically, this host adapter is connected to a motherboard in a computer through a Peripheral Component Interconnect (PCI) slot. With this type of system, peripherals are daisy chained together. These peripherals have a second port used to connect the next device in line. Usually, the SCSI host adapter sent three messages to the target and then changed the SCSI bus phase to phase Command. A sequencer on the host adapter moved a CDB from a sequencer control block (SCB) that was received from a host to a DMA channel that in turn transferred the CDB over the SCSI bus to the SCSI target.
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