Your SCSI controller will usually give you this information.
Generally this is accessed by pressing a special key-combination at boot time - Either read its manual, look up the model on hte web, or watch those early messages from the BIOS as your computer boots - Adaptec SCSI controllers usually tell you what key combination to press to be able to get /see / set options for the connected SCSI devices Eg Bus speed, bus termination, DMA options etc.
HTH
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