Any IDE unit on the mobbo ide chain will do.
In example, connect an IDE cdrom, as master, your df0, and the csppc. POwer it on and a few seconds later, you have to see the 3.1 rom screen ( if there is not any hardware fault at all )
Dont forget to put both CLK jumpers on EXT position
Anyway, the best way to be sure is to test the CSPPC on another known working amiga hardware.
