SCSI - Wikipedia
https://en.wikipedia.org/wiki/SCSI
OverviewDevice identificationHistoryInterfacesCablingSCSI command protocolDevice TypeSCSI enclosure servicesOn a parallel SCSI bus, a device (e.g. host adapter, disk drive) is identified by a "SCSI ID", which is a number in the range 0–7 on a narrow bus and in the range 0–15 on a wide bus. On earlier models a physical jumper or switch controls the SCSI ID of the initiator (host adapter). On modern host adapters (since about 1997), doing I/O to the adapter sets the SCSI ID; for example, the adapter often contains a Option ROM (SCSI BIOS) program that runs when the computer boots …
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