Help with getting an IBM DDRS-34560 working

[BetaC]

As per the title, I’m trying to figure out why this 4.5GB SCSI drive doesn’t like showing up to any of my pre-G3 hardware. I’m using a passive adapter, and I’ve tried multiple different configurations for the jumpers, but nothing seems to work when 50 pins are involved.

 

[NJRoadfan]

I had a similar drive running in a 8600. You have to set the drive to single ended mode (JP6), set the SCSI ID to 0 thru 6 only. As for the adapter, I needed to use a 50 to 68pin model with "upper byte termination".

See PDF page 41 for jumper settings: https://www.ardent-tool.com/IBM_HD/ddrs_spw.pdf

 

[BetaC]

How do I find an adapter that has that feature? I’m currently using a mono price adapter, which doesn’t specify.

 

[NJRoadfan]

Search for a dealer selling a 50 to 68-pin adapter with "upper byte" or "high byte" termination. The adapter I have actually has the words "Upper Byte Termination" molded onto it.

More info on SCSI termination voodoo here: https://staffsite.scio.k12.or.us/staffweb/mettsg/comptec/SCSI/Scsi_termination_tutorial.htm#4

 

[BetaC]

Okay, thanks.

 

[trag]

@BetaC There was also a long thread about adapters for SCA drives (wide 80 pin drives) and upper byte termination several years ago. Maybe more than one. The end point was that @max1zzz ended up designing and building some adapters. I think they're long since gone. But it might be a useful read if you can find the thread.

They're difficult to find, usually. And sometimes sellers claim they have upper byte termination and they don't. If there's just two SCSI connectors and maybe a few jumpers on the adapter, then there's no components providing any termination...

 

[BetaC]

@BetaC There was also a long thread about adapters for SCA drives (wide 80 pin drives) and upper byte termination several years ago. Maybe more than one. The end point was that @max1zzz ended up designing and building some adapters. I think they're long since gone. But it might be a useful read if you can find the thread.

They're difficult to find, usually. And sometimes sellers claim they have upper byte termination and they don't. If there's just two SCSI connectors and maybe a few jumpers on the adapter, then there's no components providing any termination...

Thank you for the advice, I ended up just giving the drive away to a coworker who has a late PCI Mac that can just use it. Prices for the adapters I saw just made a scsi to flash solution look less expensive.

 

[max1zzz]

The end point was that @max1zzz ended up designing and building some adapters. I think they're long since gone. But it might be a useful read if you can find the thread.

I actually redesigned the adapters a couple of years back and still sell them
£13 each or £12 if you buy more than one. International shipping is expensive these days though.

There is a thread in the trading section though it's pretty buried now, I really need to set up a online store at some point....

 

[cheesestraws]

Will second general recommendation of Max's adaptors. Mine's been very useful.

 

[JHanna]

Apologies for the thread necromancy, but are these 50 to 68 pin adapters with upper byte termination still available from anywhere?

I need 2 of them.