2 serial port PCI-Express add-on card, with extra low-profile bracket (SPC-22)
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SRC01G 2-Port Serial PCIe Card - Conceptronic
How to Fix PCI Serial Port Driver Issues on Windows
Pcie Asix 99100 Chip 4s 4-port Com Db9 Rs232 Serial Port Card Controller Card Pci Express 4 Ports Rs-232 To Pci-e Adapter - Add On Cards & Controller Panels - AliExpress
2 Port Serial & 1 Port Parallel PCI Card - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
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
PCIe to 2 Ports RS232 DB9 Serial Controller Card,IO-PCE382-2S - PCIe - Serial Port - My web