Good thing you asked before you plugged. SCSI does not plug into the parallel port even though one form of SCSI cable has the same format, called D-25 I think.
The Amiga 1200 did not come with SCSI natively so a card needs to be added to it to use SCSI. Some accelerators have that as an option. There is the Squirrel SCSI PCMCIA card designed to work with the 1200 and 600. Dataflyer SCSI plugs into the IDE hard drive controller and adds a port to the back of the 1200 behind that small removable door under the floppy drive in the back.
By the way, if you do have a 25 pin port (unlabeled) under the floppy drive in the back of the machine that might be a SCSI controller behind it.
