Most SCSI Host Adapters must be set to SCSI ID 7. Because of interference, you have to reduce transfer rates the longer a cable is. 50 feet is the maximum length that a serial cable should be. Connector resembles a small phone jack. Twisted pair cables use RJ45 connectors.
Connector resembles a fat phone jack.
COM Ports COM1 and COM3 use IRQ4. COM2 and COM4 use IRQ3. The majority of PC's have only 2 COM port connectors. System Assembly Basics Phillips and Flat-Head screw drivers are the most common tools needed for disassembly. Paper should be at hand for diagraming connections.