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There are three widely used bus standards, PCI (Peripheral Component Interconnect), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). In some cases, organizations such as the IEEE (Institute of Electrical and Electronics Engineers), ANSI (American Nationa1 Standards Institute), or international bodies such as ISO (International Standards Organization) have blessed these standards and given them an official status. Some standards have been developed through industrial cooperative efforts, even among competing companies driven by their common self-interest in having compatible products. The popularity of that computer led to other manufacturers producing ISA -compatible interfaces for their 110 devices, thus making ISA into a de facto standard.

IBM developed a they called ISA (Industry Standard Architecture) for their personal computer known at the time as PC AT. Introduction: A number of standards have been developed for I/O Interface.