Ensure Smooth Data Flow From Either Your Serial Or Parallel Port With An I/O Add-A-Port Adapter Cable From Cables To Go. Choose Db9-Pin Or Db25-Pin Male Serial Ports With A Bracket Or A Db25-Pin Female Parallel Port With A Bracket. These Adapter Cables Connect To The Motherboard Or I/O Adapter Via Flat Ribbon Cabling. Connectors: Internal 26-Pin Ids Dual Row To External Db25 Female Compatible With Most Brands Of Motherboards And I/O Cards Application: Parallel