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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Consumer Hardware & Components > cables (sorry for the convoluted post)

cables (sorry for the convoluted post)
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Join Date: Jan 2000
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May 8, 2000, 08:19 AM
 
Can someone tell me where I can find out about all the different types of scsi cables connections and the differences between them? For instance how many different configurations are there in the actual scsi plugs 50, 68, 25 pin?? I am confused. The reason I ask is because I have an rev b iMac and am looking into burner options and as far as I see it usb burners suck arse. I have found the iproraid scsi card for the imac but its scsi plug is a Ultra SCSI-68 /Ultra Bar 68/68 Pin .8mm (Very High Density). so I guess my question is are there lots of cable adapter options available out there or will I be totally limited to what kind of scsi burner I could get due to this type of connection? Whew, I guess that is what I wanted to say all along.
     
tonymac
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May 8, 2000, 09:18 AM
 
There are at least 4 different SCSI connector types:
1. DB-25 25pin connection; built in SCSI on older macs
2. Centronics 50; 50 pin connection; standard for most external hard drives, CDR, and scanners
3. HD-50; 50 pin high density; SCSI-2 connection used on Jaz drives
4. Ultra-68; 68 pin high density; UltraSCSI interface
And there's also the square connection on SCSI powerbooks.
As far as your iMac is concerned, you will probably need an adapter to go from the 68 pin connector on the SCSI card to the Centronics 50 pin connector on your CDR. It will probably be easier to get a cable with the correct connectors from a mail order company (Outpost.com, MacWarehouse, etc). The cable will be between $60 and $80.

Good luck.
     
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May 9, 2000, 07:56 PM
 
The cable to go from the iproraid to a standard centronics is hard to come by, but Formac sell it directly, at least they did!

Strangely, the cable was included when I bought the card, although I know it's not now.
     
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May 9, 2000, 08:02 PM
 
Sorry shmerek, in direct reply to your question, NO the mini-connector will not limit you - once you have the one lead coming off it with the correct connection on the end. Then everything else can happily daisy-chain off each other with standard(ish) leads!!! I have three SCSI devices hooked up to my RevB, Film Scanner, CD-R and a HD. No problems at all.
     
ESV
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May 10, 2000, 10:03 PM
 
We ran into this problem once with an Adaptec 3940UW card -- it took the .8mm VHD 68-pin connector, and we had a dickens of a time finding the right cable to go to a scanner from it.

I think we ended up going from .8mm VHD to standard 68-pin, then used an adapter to go from 68 pin to 50 pin, then had a 50-pin to DB-25. Ugh. The scanner happily talked to the 3940UW though, so all's well that ends well, I guess.

I think Cables to Go may still have one, and there was another outfit we ended up ordering from that had that particular cable. If I have time in the morning, I'll look it up.
     
ESV
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May 11, 2000, 07:41 AM
 
Found the source of our adapter, mentioned in my previous post.

Try Granite Digital at http://www.scsipro.com/ .

They also stock a full range of SCSI diagnostic tools, and were very pleasant to do business with.
     
   
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