Anyone got a clue how to connect the scsi-cables with terminators to the csppc board?
Terminate both ends of the scsi chain. If you have some hairier configration (some converters for example), then it gets more complex. If you want detailed help, post detailed info.
If I switch on the A4000 I get the kickstart1.3 screen.
Your A4000 is in serious trouble, then. :-)