the sca adapter has a 68 pin connector.

Buy yourself a cable with a several 68p connectors, at least 3 if it comes with a terminator attached, 4 connectors if it has no terminator.
Buy yourself two terminators if the cable has none, or 1 if the cable has one.
Buy yourself a 50 to 68 adapter. Stick this in your scsi controller
add the terminators to the end connectors of the cable.
add the scsi controller adapter and the sca adapter to the other connectors on the cable.
.
disable termination on the scsi controller or set it to auto.

That will take care of any termination issues.

Now lookin into the drive itself to see if it supports SE mode, since it's clearly marked as an LVD drive.

edit: unclear. If it only supports LVD mode, you are SOL, cables and terminators won't help. A SCSI controller supporting LVD mode will, though you won't find that in ISA. Although you could get an SE to LVD converter. Likely insanely priced, if you can find one at all.

edit2: you might try adding a jumper to the pins marked D TRGT INIT, though, you'll still need to terminate the end of your scsi cable, since this drive will not do that.

edit3: according to the manual posted by Horun, the D TRGT INIT should be already installed. so forget about that possibility. or just play around with it for the heck of it.

i have playes so much with that in past week, 80pin drive must are SE compatible to be seen, usually 50pin and 68pin are also SE, 80pin..mmmhhh not so sure.

Try to use a Force-SE jumper on the drive.
It is likely your SCA adapter does not connect DIFFSENSe.

Those WD Enterprise scsi do not have a "force SE" jumper or mode. The IBM and Quantums of same size/era do (and why I never bought the WD's, have many IBM and Quantums).
https://web.archive.org/web/20000817083839/ht … bat/918-813.pdf

https://web.archive.org/web/20001205061600/ht … enterprise.html

Ah, okay.
Then I'd like to see a picture from the front and rear side of that adapter, without cables - to check DIFFSENSe.

Yeah it may be a LVD only SCA adapter. It might be possible to mod it to force SE mode from the bus....Cheap SCA adapters from China

Regardless, you DO need an external terminator. SCA drives never support internal termination, and the adapters don't provide it either

maxtherabbit wrote on 2024-01-13, 02:36:

Regardless, you DO need an external terminator. SCA drives never support internal termination, and the adapters don't provide it either

Good observation. The drive appears on end connector, needs to be moved and a terminator placed there....

Alternatively a 68pin terminator could be installed on the spare socket of the adapter

DaveJustDave wrote on 2024-01-12, 17:56:

So I have a newer 80 pin SCSI drive hooked up via a 80 to 50 pin adapter that supplies power (since there is no molex on the dri […]
Show full quote

So I have a newer 80 pin SCSI drive hooked up via a 80 to 50 pin adapter that supplies power (since there is no molex on the drive), 50 pin cable running from the adapter to a VLB adaptec scsi board on my 486.

I can't for the life of me get the drive to detect. I am thinking it's a termination issue? How would I even get this setup to terminate? Do I need a Terminator for internal 50 pin cables?

20240111_235856.jpg

20240112_000005.jpg

What's the news Dave?