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PCI Express - Wikipedia
SHINESTAR PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC with Low Bracket - NWCA Inc.
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Amazon.com: IO Crest 2 Port Serial PCI-e 1.0 x 1 with Full and Low Profile Brackets SI-PEX15037 : Electronics
Amazon.com: REDLUX PCIe 3.0 to NVMe (4) M.2 Adapter for M.2 (M Key) SSD, X16,Compatible with PCIe 3.0 Motherboards and Backward Compatible with PCIe 2.0 and PCIe 1.0 : Electronics
Introduction to PCI Express (withdrawn product) > Lenovo Press