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> SCSI ... which allowed you to connect to exactly one serial device Pedantry, but: SCSI is parallel, not serial. The distinction is the number of data lines i
by quesera 6y ago
> SCSI ... which allowed you to connect to exactly one serial device
Pedantry, but: SCSI is parallel, not serial. The distinction is the number of data lines in the cable -- serial has one line, and SCSI has 8 or 16. This allows for much faster data transfer rates, at the (significant) expense of greater complexity and cabling cost.
The other advantage of SCSI is the ability to connect to multiple devices through "daisy-chaining". Old-style serial connections (RS-232, RS-422, etc) were strictly point-to-point.
Modern SCSI (SAS) runs the SCSI protocol over a serial connection, because port clock speeds are now fast enough that the parallel advantage isn't important for most uses.
Not to detract from USB though. It was an improvement over all of the above, and nowadays it's pretty fast, too.