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From the perspective of the PC as a whole, SCSI host adapters are expansion devices, since they plug into a system bus and represent a peripheral device on the system bus. (Some motherboards have integrated SCSI host adapter chips, but these are logically similar to separate host adapters even if no distinct physical card is used.) Host adapters typically require several different system resources, depending on the system bus that the host adapter is designed for, and the method it is using for transferring data over the system bus.
The following resource types are typically used on various adapters:
Most newer SCSI host adapters, especially those using the PC bus, support the Plug and Play initiative. Plug and Play allows the system to configure resources for the host adapter automatically in many cases, reducing configuration difficulties. (Note that I am speaking here of Plug and Play at the system level, which deals with system resources. This is different than so-called Plug and Play SCSI, which is similar in concept but is applied to dynamically allocating SCSI device IDs on the SCSI bus, not PC system resources.)