The cables are intended to plug in the SCSI ID selectors in the back, so you don't need to alter the devices inside the case.
Doubtfully you'll have the proper SCSI device to attach those. Set the SCSI ID directly on the devices.
SCSI devices must have an unique number like as follow:
- 0 OR 7 for the SCSI controller (the Squirrel is 0, IIRC);
- 1 to 6 for the other devices
Prefer 1 to the hd and 2 for the CD.
Yes, you need terminators in both ends of the cable (one is built-in on the Squirrel), so you only need to terminate the other end.
Check the hd (if you have one), normally they have terminators on the board (in a form of two resistors packs, or a jumper).
Remember to terminate only[/] the last device in the cable.
When running hdtoolbox, remember to call it via a CLI and type "hdtoolbox squirrel.device" in order to find the SCSI hd.