Bendix
Well-known member
I have been working on this for quite some time, googled a lot and finally succeeded, so I thought I share my findings.
Since the old 50 pin SCSI drives are getting scarce and ebay is full of affordable UW server drives (of ridiculously huge sizes for an old SE/30) I experimented with these and got as far as getting it working in an external case on a 50 pin cable and external active termination. I used a 50 pin to 68 pin male gender changer to connect the drive to the 50 pin cable in the case, jumpered the drive to “SE”, and “NO WIDE” and finally had a stable system.
Then I tried to do the same on the internal bus, used a 3 connector 50 pin cable with a terminator at the end but could not get it to work at all, no matter whether I jumpered the drive for supplying term power or not. I even tried a longer flat cable with an adapter for an external 50pin terminator with LED, so that I was positive the bus was terminated. Either the drive was not ready or not visible at all.
I finally found an entry in this forum, that advised to use a 50 to 68 pin female gender changer on the logic board and then go from there with a short cut 68 pin flat cable with active termination at the end and that did the trick.
So here it is, my SE/30 with a 68 GB Maxtor/Quantum Atlas 10K III UW SCSI. I can connect external devices like disks and CD ROM drives and the SCSI bus seems stable enough.
Since the old 50 pin SCSI drives are getting scarce and ebay is full of affordable UW server drives (of ridiculously huge sizes for an old SE/30) I experimented with these and got as far as getting it working in an external case on a 50 pin cable and external active termination. I used a 50 pin to 68 pin male gender changer to connect the drive to the 50 pin cable in the case, jumpered the drive to “SE”, and “NO WIDE” and finally had a stable system.
Then I tried to do the same on the internal bus, used a 3 connector 50 pin cable with a terminator at the end but could not get it to work at all, no matter whether I jumpered the drive for supplying term power or not. I even tried a longer flat cable with an adapter for an external 50pin terminator with LED, so that I was positive the bus was terminated. Either the drive was not ready or not visible at all.
I finally found an entry in this forum, that advised to use a 50 to 68 pin female gender changer on the logic board and then go from there with a short cut 68 pin flat cable with active termination at the end and that did the trick.
So here it is, my SE/30 with a 68 GB Maxtor/Quantum Atlas 10K III UW SCSI. I can connect external devices like disks and CD ROM drives and the SCSI bus seems stable enough.
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