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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
The Peripheral Component Interconnect or more commonly known as PCI is a standard for connecting a lot of devices inside your computer to extend its capabilities. Devices like sound cards, modems, NIC, TV Tuners, and some video cards have at some point or another have used the PCI port. The latest version of PCI known as PCI express is a much improved version in terms of speed. PCIe uses a serial interface instead of the old parallel interface used by PCI. It also utilizes individual buses for each of the devices connected to it instead of a shared one like what PCI uses.