It's suddenly started working again! When I I use the SCSI Mounter progrm that is part of the Squirrel software it does not show the CDRom.I'm not sure if this is down to having no terminator or if its the wiring on the custom inerface?If there is no terminator could this be the problem and what number should I set the jumpers to on the SCSI chain baring in mind that for the present I'll only be using the CDRom on the Squirrel interface.