MCA (MicroChannel Architecture): Offers high bandwidth at 20-160 Mbps. Offers many unique intelligence features, such as peer-to-peer communication, bus mastering, automatic configuration, reliability/data integrity, and remote communications/diagnostics. Compared to other buses in use, MCA is relatively expensive and not widely supported.
PCI: Offers high bandwidth at 132 to 264 Mbps. Offers similar features to Microchannel, but limited in the extensibility and expansion slots. PCI appears to be the emerging de facto standard for high-performance PC expansion buses.
USB (Universal Serial Bus): A group of computer vendors including IBM, Intel, and Microsoft introduced the Universal Serial Bus peripheral connection architecture in June 1995, which is targeted at peripheral connections. The universal bus will combine serial, parallel, mouse, telephony, and keyboard ports into a single standard. This will enable hot, active plug-and-play of peripherals, and any port can be used for any peripheral. The universal serial bus will feature bandwidths of up to 12 Mbps, a data rate could benefit the current 1 Mbps for parallel ports and 2 Mbps for serial ports. This higher data rate could benefit telephony because serial and parallel ports don't have enough bandwidth for digital audio and digital telephony.
IEEE 1394 (Firewire): Co-developed by IBM and Apple, Firewire employs a modified GameBoyreg. connector to carry consumer-grade I/O traffic and support a wide range of