Members of the USB-IF in 1999 developed a standard for MIDI over USB, the “Universal Serial Bus Device Class Definition for MIDI Devices”. MIDI over USB has become increasingly common as other interfaces that had been used for MIDI connections (ISA card, game port, etc.) disappeared from personal computers. Linux, Microsoft Windows, Macintosh OS X, and Apple iOS operating systems include standard class drivers to support devices that use the “Universal Serial Bus Device Class Definition for MIDI Devices”.