Embedded motherboard designs change slowly when it comes to peripheral interfaces. ISA-based interfaces like PC/104-Plus remain because it supports legacy boards and it is easy to design peripheral boards, but the interface for the future is PCI Express (PCIe). While there are a host of PCIe daughter board options, the Mini-PCIe form factor offers a compact expansion option for embedded motherboards.
A single Mini-PCIe socket has been commonly found on embedded motherboards
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