Re: SCSI Gurus: HELP!

[bazyar@mrcnext.cso.uiuc.edu (Jawaid Bazyar)]

snelson@umaxc.weeg.uiowa.edu (Steven Nelson) writes:

>It sounds like you need terminator power on the Quantum.  Evidently the
>Seagate is supplying power to the bus so the SCSI chain works, but the
>Quantum isn't, so it doesn't work alone.  Funny thing, I thought the Ramfast
>was supposed to supply power to the bus.  Apple SCSI cards do not, so a
>device on the chain needs to supply it.  How, you ask?  I don't know, but
>I use a Quantum 105 in a external case with an Apple HS SCSI card and it
>boots fine!  So there must be some way of telling the Quantum to supply
>bus power, a jumper somewhere perhaps.  I guess I was lucky that mine came
>configured OK, and I never had to learn how to power a SCSI bus.  But it
>does work, because mine _does_ work.  Don't give up, keep trying.

  Most devices supply terminator power; however, said power supply line
is fused, and if you blow that fuse, the device will stop supplying
terminator power. This happens quite frequently, especially if you add/and
or remove ddevices from a SCSI chain with everything powered up.

  The RamFAST only supplies term power if you request it to, either by
setting Dip Switch #1 on the Rev. C, or removing the jumper from the
upper left corner of the Rev. D.

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