disk operation is unveiled at NAMM international Sound & Music Expo, Chicago. Production Model Serial Number 001 is issued to Stevie Wonder. July July 1 – Wonderland murders: The Wonderland Gang of cocaine dealers is brutally murdered in Los Angeles. Eddie Nash is suspected of involvement, but will never be convicted. July 3 – The Toxteth riots in Liverpool, England, start after a mob saves a youth from being arrested. Shortly afterward, the Chapeltown riots in Leeds start after increased racial tension. July 7 – United States President Ronald Reagan nominates the first woman, Sandra Day O'Connor, to the Supreme Court of the United States. July 9 – Donkey Kong is released, marking the first Donkey Kong and Mario smash hit arcade game developed by Nintendo in Japan. July 10 Mahathir bin Mohamad becomes the 4th Prime Minister of Malaysia. 1981 Handsworth riots in Birmingham begin, followed by further 1981 England riots in several urban areas including Liverpool and Leeds. July 16–21 – England become the first team this century to win a cricket Test match after the follow-on when they beat Australia by 18 runs at Headingley cricket ground, Leeds, England. July 17 Hyatt Regency walkway collapse: Two skywalks filled with people at the Hyatt Regency Hotel in Kansas City, Missouri, collapse into a crowded atrium lobby, killing 114. Israeli aircraft bomb Beirut, destroying multi-story apartment blocks containing the offices of PLO associated groups, killing approximately 300 civilians and resulting in worldwide condemnation and a U.S. embargo on the export of aircraft to Israel. July 19 – The 1981 Springbok Tour commences in New Zealand, amid controversy over the support of apartheid. July 21 – Panda Tohui is born in Chapultepec Zoo in Mexico City, the first panda to ever be born and survive in captivity outside of China. July 29 – A worldwide television audience of over 750 million people watch the Wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, UK. July 30 – 1981 Polish hunger demonstrations: As many as 50,000 demonstrators, mostly women and children, take to the streets in Łódź to protest about food ration shortages in Communist Poland. August August 1 – The first 24-hour video music channel MTV (Music Television) is launched in the United States and airs its first video, Video Killed the Radio Star by The Buggles. August 9 – 1981 Major League Baseball strike