Parallel SCSI
（重定向自Fast SCSI）
![Amphenol-50 SCSI plug](/Images/godic/202501/12/Centronics_50_SCSI_connector4259.JPG")
![NCR 53C94 SCSI-2 controller in PLCC-84 package.](/Images/godic/202501/12/Ncr_53c94_scsi_asic4259.jpeg")
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Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is one of the interface implementations in the SCSI family. In addition to being a data bus, SPI is a parallel electrical bus: There is one set of electrical connections stretching from one end of the SCSI bus to the other. A SCSI device attaches to the bus but does not interrupt it. Both ends of the bus must be terminated.