gave a talk at Beaconsfield Library, which he had visited as a child, and donated the income from the event to it. He also visited his former school to speak to the students. Pratchett often wore large, black hats, a style described as "more that of urban cowboy than city gent". Concern for the future of civilisation prompted him to install five kilowatts of photovoltaic cells (for solar energy) at his house. Interests Computing Pratchett started to use computers for writing as soon as they were available to him. His first computer was a Sinclair ZX81; the first computer he used properly for writing was an Amstrad CPC 464, later replaced by a PC. Pratchett was one of the first authors to routinely use the Internet to communicate with fans, and was a contributor to the Usenet newsgroup alt.fan.pratchett from 1992. However, he did not consider the Internet a hobby, just another "thing to use". He had many computers in his house, with a bank of six monitors to ease writing. When he travelled, he always took a portable computer with him to write. In a 1995 interview with Microsoft co-founder Bill Gates, Pratchett expressed concern about the potential spread of misinformation online. He felt that there was a "kind of parity of esteem of information" on the internet, and gave the example of holocaust denial being presented on the same terms as peer-reviewed research, with no easy way to gauge reliability. Gates disagreed, saying that online authorities would index and check facts and sources in a much more sophisticated way than in print. The interview was rediscovered in 2019, and seen by Pratchett's biographer as prescient of fake news. Pratchett was a video game player, and collaborated in the creation of a number of game adaptations of his books. He favoured games that are "intelligent and have some depth", citing Half-Life 2 (2004) and fan missions for Thief as examples. The red army in Interesting Times prompted comparisons to the 1991 puzzle game Lemmings. When asked about this connection, Pratchett said: "Merely because the red army can fight, dig, march and climb and is controlled by little icons? Can't imagine how anyone thought that ... Not only did I wipe Lemmings from my hard disk, I overwrote it so I couldn't get it back." He described The Elder Scrolls IV: Oblivion (2006) as his favourite video game, and said