Amazon.com: RS232 (2 Male to 1 Female) Serial DB9 Splitter Cable : Electronics
PCI-E to RS232 2-Port Converter, PCI Express Controller Expansion 2-Port Serial Port Converter Expansion Card for PC: Amazon.co.uk: Computers & Accessories
RS232 2 click - full RS232 to UART signal conversion - MIKROE
Black Box ACX1MR-AR KVM Receiver 2-Way Analog Audio RS2322 Expansion Card Mod Ext
Amazon.com: PCI-E to RS232 2-Port Serial Port Converter Adapter, Dual Serial RS-232 PCIe Card Low Bracket with 16C550 UART, RS232 PCIe X1 Card for Desktop : Electronics
KB RS232-2 HS 65x8 | 50120434
UNITEK Y-1050 USB Male to DB9pin RS2322 Adapter Cable Line (1.5m)