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ISA (pronounced eye-suh), which is an acronym for Industry Standard Architecture, is a data transfer standard introduced in the IBM PC in 1982. An ISA bus, or data pathway, operates at 8 MHz clock rate and has a maximum data rate of 8 MBps. In newer systems ISA buses are used only for slower devices.

PCI, which stand for Peripheral Component Interconnect, was introduced in 1992. It operates at clock speeds of 33 or 66 MHz. At 32 bits and 33 MHz, a PCI bus has a maximum data rate of 132 MBps. Sockets, or slots, for PCI cards are shorter than those for ISA plug-in cards.