Adding to Jeff's comments, I would say that you probably need to terminate the upper 8 bits. I had a real head scratcher a few years back trying to get SCA drives working in some of my older Quadras and the solution was a rather expensive SCA-50 pin adapter which provided upper byte termination. Even when forcing the drive into SE mode with the lower byte terminated, the drives (I tried more than 1 type) would simply not work without the upper byte being terminated.
Sadly, the seller I purchased most of my SCSI paraphernalia from has closed shop... And I could have used some more of the adapters too! Derek On Feb 2, 2015, at 11:29 AM, Jeff Walther wrote: > > > On Saturday, January 31, 2015 at 10:38:37 PM UTC-6, Scott Holder wrote: > Hey folks, > > Recently picked up an 18gb LVD SCSI drive from a Sun machine for my LC475. > Already had an adapter kicking around, so I now have it adapted to the > classic 50-pin SCSI. The problem is it only works when I have something > terminated plugged into the external SCSI. > > Most likely, your adapter does not provide termination. SCA drives have no > on-board termination, so, in order to terminate your SCSI bus, you really > should have termination in the adapter. The $2 - $5 adapters on Ebay and > Amazon do not have termination. The least expensive SCA - 50 pin adapters > I've seen with termination are about $20, although OWC did have some for ~$10 > for a while. I think they're out, unless they restocked. > > Ideally, the upper 8 pins on the SCA drive should be terminated as well (SCA > drives are wide), not just the 50 pins in use. > > Jeff Walther -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
