StarTech.com 24in Internal USB Motherboard Header to 2 Port Serial RS232 Adapter - DB-9 Male Serial - IDC Female Serial - 24

Extensive list of OS support and Microsoft WHQL certified drivers makes for maximum compatibility and simple installation Direct connection from the motherboard header allows for a clean and completely contained setup without taking up a PCI/PCI-Express slot in your system Standard and low profile/half-height bracket included to ensure fitment in any system