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===Mixing wide and narrow===
Both narrow and wide SCSI devices can be attached to the same parallel bus. All the narrow devices must be placed at one end and all the wide devices at the other end. The wider part of the bus needs to be terminated between the wide and narrow devices because the high half of the bus ends with the last wide device. This can be done with a cable designed to connect the wide part of the bus to the narrow part which either provides a place to plug in a terminator or includes the terminator itself.{{efn|This is sometimes referred to as a cable with high-9 termination.}} Specific capability commands allow the devices to determine whether their partners are using the whole wide bus or just the lower half and drive the bus accordingly.
Alternatively, each narrow device can be attached to the wide bus through an adapter. As long as the bus is terminated with a wide – internal or external – terminator, there is no need for special termination.<!--[[User:Kvng/RTH]]-->▼
▲Alternatively, each narrow device can be attached to the wide bus through an adapter. As long as the bus is terminated with a wide – internal or external – terminator, there is no need for special termination.
===SCA adapters===
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