A3000 and CSPPC cards

[Castellen]

That's correct, you'll need to do the simple hardware modification in order for the Cyberstorm SCSI controller to function.
It's just a matter of fitting a wire which puts one of the interrupt lines into the CPU slot.  Most (all?) A3000D were like this and some A3000T.

I wrote an easy step-by-step guide a few months ago showing how to do this.
It's on Aminet, or look on my webserver:

http://amiga.serveftp.net

Look in the downloads section.

[Castellen]

The solder point in guide I wrote is a slightly tidier and easier way of doing the same thing.

Pin 19 of CN600 is the physically closest and easiest point to the CPU slot.
If done as per the instructions, you get a very professional looking job.

In the testing section, you'll note that the testing is done from U352 pin 21 as a 2nd verification the wire has been soldered to the correct place.
U350-21 and CN600-19 are electrically jointed together.