The first electronic hobbyist to take an interest in building computers, whom we know of, was Stephen Gray. In 1966, he founded the Amateur Computer Society (ACS), an organization that existed mainly to produce a series of quarterly newsletters typed and mimeographed by Gray himself.

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Angola - The World Factbook (cia.gov) Bantu-speaking people settled in the area now called Angola in 6th century A.D.; by the 10th century various Bantu groups had established kingdoms, of which Kongo became the most powerful. From the late-14th to the mid-19th century, a Kingdom of Kongo stretched across central Africa from present-day northern Angola into the current Congo republics.

From ACS to Altair: The Rise of the Hobby Computer (technichistory.com) A certain pattern of technological development recurred many times in the decades around the turn of the twentieth century: a scattered hobby community, tinkering with a new idea, develops it to the point where those hobbyists can sell it as a product. This sets off a frenzy of small entrepreneurial firms, competing to sell to other hobbyists and early adopters. Finally, a handful of firms grow to the point where they can drive down costs through economies of scale and put their smaller competitors out of business. Bicycles, automobiles, airplanes, and radio broadcasting all developed more or less in this way.