Notable for the trapezoidal shape of its attachment area. A linking of one or more SCSI devices to a computer. Sometimes also called a daisy chain. There can be only one chain per computer, and each device can belong to only one chain.
Some terminators are external, while some devices feature built-in termination.
Somewhere, on almost all external devices, there is a means of mechanically setting the SCSI ID number. Sometimes the numeral is hidden by a sliding door, and on some cheaper devices the numeral is permanently set, and cannot be changed. Next, for best results, set the device first in line from the computer to a low ID number, then set each additional device to a higher number than the one before it. Don't worry too much if sequential numbering is not possible, everything will probably work just fine as long as no numbers are duplicated. Keep in mind that some devices, notably scanners and older CD-ROM drives, can be temperamental.