Weekend finds - uVAX II w/ SCSI!

Chuck McManis <cmcmanis(a)mcmanis.com> wrote: There's good news and bad news. The good news is that yes, those definitely are differential transceivers. The bad news is that FAST SCSI 2 is *NOT* differential. It's single ended. 99.9% of the drives you're likely to encounter are single-ended. Differential and single-ended will not mix [1]. It sounds like this controller will ONLY work with differential drives, unless they provided some sort of jumper arrangement to bypass the differential transceivers. There exist single-ended to differential converters, but they're very expensive. Good luck! Eric [1] The new-fangled "Low Voltage Differential" (LVD) is different than the traditional SCSI differential. They cleverly designed most (all?) LVD drives so that they will work on either LVD or single-ended busses. But LVD drives will NOT operate on traditional differential SCSI.