As Personal Computers (PCs) continue to decrease in size and become more streamlined, the input/output (I/O) slots have virtually disappeared, posing a challenge for applications like point-of-sale (POS) that require the connection of multiple peripheral devices. The I/O bus, or peripheral bus, is the pathway that joins peripheral devices to a PC. Industry Standard Architecture (ISA), Peripheral Component Interconnect (PCI) and Universal Serial Bus (USB) are the three busses commonly used in today’s PC, thin client or server applications. In comparing ISA, PCI and USB, the key differentiator is ease of installation.
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