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I'm 99% sure that particular IBM drive has dip switches on it to enable onboard termination. Whether those are accessible from outside its current case is another question entirely.</div>
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-Adam</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Roundtable <roundtable-bounces@muug.ca> on behalf of Trevor Cordes <trevor@tecnopolis.ca><br>
<b>Sent:</b> Thursday, January 12, 2023 6:08:38 PM<br>
<b>To:</b> Alberto Abrao <alberto@abrao.net><br>
<b>Cc:</b> Continuation of Round Table discussion <roundtable@muug.ca><br>
<b>Subject:</b> Re: [RndTbl] Need to borrow a SCSI Controller</font>
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<div class="PlainText">On 2023-01-12 Alberto Abrao wrote:<br>
> <br>
> I am not very familiar with SCSI, It may be easier for me to just <br>
> explain what I want to do.<br>
<br>
Haha, welcome to the very simple and carefree world of SCSI.<br>
<br>
> - IBM TotalStorage Ultrium Tape Drive (3580-L23). <br>
> <a href="https://www.ibm.com/support/pages/overview-ibm-totalstorage-ultrium-tape-drive-3580-l2">
https://www.ibm.com/support/pages/overview-ibm-totalstorage-ultrium-tape-drive-3580-l2</a><br>
<br>
Ultra160 is 68 pin, LVD and wide. It says the tape itself can push<br>
20MB/s, up to 40 if you luck out on compression. So really any lvd<br>
fast wide card should run it at max speed.<br>
<br>
> - SCSI Cable. One ends seems to connect on the drive, the other one <br>
> would connect to the card, presumably.<br>
<br>
Did you check if your cable can connect to external box? And the cable<br>
is the same on both sides? Should look like a super-dense connector.<br>
You can match it up with pictures online.<br>
<br>
The IBM spec says they supplied a terminator with the drive. That<br>
probably means the drive itself doesn't do optional self-termination<br>
(bummer). Is the 2nd connector on the drive case filled with a<br>
terminator? I do not have any 68 pin terminators. They are rare.<br>
Might be easier to find another external 68 pin SCSI device that can do<br>
self-termination and put that on the end of the chain. :-)<br>
<br>
I have these cards that offer 68-pin external connectors you can<br>
borrow. Oh, btw, you'll need a box with PCI. Almost no old-style SCSI<br>
cards exist for PCIe, certainly none that people have just kicking<br>
around.<br>
<br>
With external 68-pin:<br>
IBM RS/6000 PCI 11H8085 AN011H8083 NCR 53C825 chipset sym53c8xx<br>
Tekram DC-390F Symbios Logic 53C875<br>
Those 2 will get you only get you 20MB/s, but that should be fine<br>
<br>
With only internal 68-pin:<br>
Adaptec ASC-29160N PCI (suports 160MB/s)<br>
<br>
But the internal-only one can be turned into external with:<br>
SCSI CABLE internal to external 68 pin; 3 drop internal, 1 drop<br>
external on metal slot bracket; int68-int68-int68-ext68<br>
<br>
Loving SCSI yet?<br>
<br>
If the Ultrium drive doesn't need to be kept in mint condition, I often<br>
find it's best to crack open the external SCSI case those things are in,<br>
take out the bare drive, and plug it into your SCSI setup internally,<br>
using your normal PS power for it. Much easier to do internal<br>
termination. I have many internal 68 pin cables with terminators<br>
built-in or tacked on.<br>
<br>
If you can't find an external terminator or a device that can self<br>
terminate to put on the chain, then your only choice is converting to<br>
internal.<br>
<br>
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