DB (D-Sub) Connectors and COM Ports A serial port on a PC is a male 9-pin connector (DE-9 D-sub). Early PCs had two 9-pin connectors or one 9-pin and one 25-pin (DB-25). On a PC, serial ports are ...

a DB to DB adapter is used to connect a 9-pin mouse to a 25-pin serial port. See D-sub connectors. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.