Blizzard 1230IV Internal SCS device connections

[Boot_WB]

Here is the pinout of the DB 25 scsi connector, and here is the pinout of the internal IDC 50-pin connector.

I think the easiest way for you would be to adapt a standard 50-pin scsi cable to connect to the Blizzard 25-pin header (using the pinouts supplied). Ensure that you connect the intermediate ground connectors - your Amiga will not blow up if you don't, but you may experience data corruption problems.

Then, use individual 50 - 68 pin adapters (like this)to connect your scsi devices.

68-pin cables tend to use single core wires, which will not work properly with the 25-pin IDC crimp connector (they are much narrower cables than the older 50-pin types). Although you could solder a connector onto the 68-pin cable, the result would probably be quite fragile.

[Boot_WB]

Assuming the drive can operate in single-ended mode, it should work (as you say, a lot of adapters though!). You can get 50>80 pin adapters, which would cut down the adapter chain a bit at least.
My experience with 68>80 pin adapters was not good though, poor contact with the 80-pin SCA connection of the hard drive - the hard drive kept dropping out. Cheapo adapters!

There's usually a "force single-ended mode" jumper (usually marked SE), I'd recommend you set that. And, of course, you'll have to set the scsi ID in the 0-7 range, as scsi-2 only has 3 ID bits (0-7).