Knuckles writes Austrian computer pioneer Heinz Zemanek, the first person to build a fully transistorized computer on the European mainland, died in Vienna, aged 94 (link in German). Officially named Binär dezimaler Volltransistor-Rechenautomat (binary-decimal fully transistorized computing automaton), but known as "Mailüfterl", the computer was built in 1955 and in 1958 calculated 5073548261 to be a prime number in 66 minutes. Its power was comparable to a small tube computer of the time, and it measured 4 by 2.5 by 0.5 meters. "Mailüfterl" means "may breeze" in Viennese German and was a play on US computers of the time, like MIT's Whirlwind. 'Even if it cannot match the rapid calculation speed of American models called "Whirlwind" or "Typhoon", it will be enough for a "Wiener Mailüfterl"' (Viennese may breeze), said Zemanek. Mailüfterl contained 3,000 transistors, 5,000 diodes, 1,000 assembly platelets, 100,000 solder joints, 15,000 resistors, 5,000 capacitors and 20,000 meters switching wire. It was built as an underground project at and without financial support from the technical university of Vienna, were Zemanek was an assistant professor at the time. In 1961, Zemanek and his team moved to IBM, who built them their own lab in Vienna. In 1976, Zemanek became an IBM Fellow and stayed at IBM until his retirement in 1985. He was crucial in the creation of the formal definition of the programming language PL/I. The definition language used was VDL (Vienna Definition Language), a direct predecessor of VDM Specification Language (VDM-SL). He remained a professor in Vienna and held regular lectures until 2006.