Member Avatar for convict

Ihave 3 scsi hds and i just bought another computer that was runnin scsi.Never hooked them up before if someone could take the time to explain to me how to go about gettin them to read in the bootup ie: boot 0 boot 1 boot 2 etc.. And where the pins need to be set on them and in what order

thank-you

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As asked about getting SCSI drives to appear at boot, and after pointed to vendor docs while touched on addressing, below is a compact, practical checklist that fills gaps most people run into but that were not detailed in the thread.

First confirm the host adapter type (narrow 50-pin vs wide 68-pin, SE vs LVD). Drive and cable types must match the adapter or use the correct bridge cables; mixing signaling types can prevent the bus from working. Only the devices at the physical ends of the parallel SCSI cable should provide termination — every other connector must have termination disabled. See general SCSI bus behavior for background: SCSI (Wikipedia).

Set unique SCSI addresses for each drive using the drive’s ID jumpers/DIP/rotary switch (consult the drive label/manual for the exact jumper map). Physical location on the cable does not by itself determine which disk the system will boot from; boot selection is controlled by the host adapter BIOS or its configuration utility. If the adapter provides a boot menu, use that to choose which assigned SCSI ID to boot from; if not, consult the adapter manual to see its default selection rules.

Quick hookup and debug checklist:

  • Power off and connect the adapter to the first drive, then continue to the last connector; enable termination only on the two ends.
  • Verify each drive has a distinct ID and correct terminator setting.
  • Enable the adapter/SCSI BIOS in the system BIOS if required and enter the adapter’s setup at POST to confirm device list and boot device.
  • If drives do not appear: recheck cable seating, termination, duplicate IDs, and whether any drive is SE vs LVD incompatibly mixed.
    Do not hot-swap unless the controller and drives explicitly support it.

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Member Avatar for raybay

Go to Google search, and type in SCSI Drive Installation Guide where you will get lots of results with pictures and diagrams.
If the drivers are by different manufactures, they may be different, you can work it out. Also, every manufacturer of SCSI drives has instructions and images online.
This is just not a good topic to attempt assistance here... too many options... too much time... too difficult to describe what you can see on the manufacturer's site.

Member Avatar for jbennet

generally you daisy chain them and set the switchs on the bottom to go from 1 to 8 in the order they are on the chain (and how you want them to boot)

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