| From: | Neil Bothwick |
| Date: | 3 Jul 2001 at 17:30:28 |
| Subject: | Re: Arright, what's going on here? [SCSI update] |
Sean Courtney said,
> --- Neil Bothwick <neil@wirenet.co.uk> wrote:
>> It's wrong. A SCSI chain must be a straight line electrically. Every
>> point on the chain must have exactly two cable runs running away from
>> it, except for the two ends, which must be terminated.
> BUT -- if I were to have only two ends, I would have:
The basis for a correct SCSI chain.
> - The Cyberstorm at the beginning of the chain
> - A terminator would then HAVE to be next -- wouldn't that cause a
> problem?
Why does the CyberStorm have to be at the beginning of the chain?
What's wrong with
Term---HD---CSPPC-----external devices----Term
> The way I have it now, I have:
> First, the terminator, which is theoretically providing termination to
> the Cyberstorm. The next thing on the SCSI chain is the Cyberstorm,
> then the hard drive, then the ports, then the external port.
> maybe it should look like this:
> [terminator]----[Cyberstorm]----[hard drive]---[blank port]----[blank
> port]---[external port, Zip]---[CD drive]---[terminator]
That looks better.
> Here's my old diagram, revised to what it REALLY looks like:
> [10] .------------------------------.
> [9] | .-----. |
> .-----. | | [2] |----[1] |
> | [8] | | `--|--' |
> `-----' | / |
> | | .------. / |
> | | | [3] |-< |
> .-----. | `------' | |
> | [7] | | _/ |
> `-----' | [4] |
> `---[6]|------[5]__/ |
> | |
> `------------------------------'
> Key:
> 1 -- internal active SCSI-3 terminator
> 2 -- Cyberstorm PPC
> 3 -- Compaq SCSI-3 hard drive
> 4 -- unused port
> 5 -- unused port
> 6 -- external port with MD68-DB25 converter
> 7 -- Zip drive
> 8 -- CD burner
> 9 -- MD50-MD68 converter
> 10 -- external SCSI-3 active terminator
If it works without the HD and fails with the HD connected, I'd suspect
your HD is terminated.
Cheers
Neil
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