Siig Dual-Serial Port PCI RS-232 CTLR (LB-S00014-S1)
Micro Connectors, Inc USB to Dual Serial DB9 Adapter Windows 10/Win 8/7/XP/Vista/Mac E07-162 - The Home Depot
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2 Port DB9 Serial Port Bracket Header - DB9 Cables & DB25 Cables | StarTech.com
2-Port PCI Express RS232 Serial Card - Serial Cards & Adapters | StarTech.com
Amazon.com: SIIG Dual (2) Serial Port / RS-232 and Single (1) Parallel Port PCIe Card Compatible with 16C550 UART (JJ-E20411-S1) : Electronics
Fujitsu Dual Serial Port RS-232 Card With Splitter Cable CP-140 S26361-F3465-L7 | eBay
Allen Bradley 1769-L30 /A CompactLogix Dual Serial Port Processor 256KB - PLCCable.com - Automation Supplies and PLC Tools
Dual Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ FTDI Chip - Coolgear
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PCI to 2 Dual COM RS232 Serial I/O Port Riser Card PCI to 2 RS232 Expansion Card Dual Serial Port Card Support Plotter
Dual-Serial Port plus Single Parallel Port PCIe Card
USB to 2 TTL serial port USB to dual serial port Two TTL to USB5V3.3VFT2232D dual serial port - AliExpress
2 Ports Rs232 34mm Expresscard To Dual Serial Port Db9 Com Rs-232 Expansion Card For Laptop Mcs7720 Chipset - Add On Cards & Controller Panels - AliExpress
StarTech.com Dual Serial Parallel PCI Card - 3 Port 2S1P PCI (PCI2S1P)
FTDI Dual Serial Port DB-9 RS-232 MINI-Adapter With Cable | Cooldrives