Standard form factor (ATX and its derivatives) desktop/tower PCs have the old fashioned parallel printer port alongside all the newer I/O options.
SCSI Disk Mode requires a switch on the adapter or a special cable with a missing pin that tells the PB that it's an external SCSI HDD when it boots.
There are a lot of different ways to do a SCSI chain with a CD in between the 605 and the 5300.
Post a pic of all your adapters and SCSI cables and we can try to figure out how to cobble it together. You've already got a non-Apple ROM'd CD, correct?
SCSI Disk Mode requires a switch on the adapter or a special cable with a missing pin that tells the PB that it's an external SCSI HDD when it boots.
There are a lot of different ways to do a SCSI chain with a CD in between the 605 and the 5300.
Post a pic of all your adapters and SCSI cables and we can try to figure out how to cobble it together. You've already got a non-Apple ROM'd CD, correct?