Serial Card - 2-Port PCIe - 16C1050 UART - Serial Cards & Adapters | StarTech.com
Moxa CP-102E 2-Port RS-232 Serial PCI Express Board, DB-9s on bracket
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PCIe Serial Expansion Card PCI Express 1.0 x1 to 2 Port Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC w - AliExpress
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StarTech.com 16 Port PCI Express Serial Card - High-Speed PCIe Serial Card - expansion module - PCIe 1.1 - RS-232 x 2
Amazon.com: PCIE 2 Port Serial Expansion Card PCI Express to Industrial DB9 Serial / RS232 COM Port Adapter 16C550 UART WCH382 Chip for Desktop PC Windows 10 with Low Bracket : Electronics
StarTech.com 2 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART - PCIe RS232 - PCI-E Serial Card (PEX2S553LP) - serial adapter - PCIe - RS-232 x 2