Although promoted and used by manufacturers such
as General Motors, Boeing, and others, it lost market
share to the contemporary Ethernet standard and
was not widely adopted. Difficulties included
changing protocol specifications, the expense of MAP
interface links, and the speed penalty of a token-
passing network. The token bus network protocol
used by MAP became standardized as IEEE standard
802.4 but this committee disbanded in 2004 due to
lack of industry attention.