In 1966 I became a PhD student of A. van Wijngaarden at the Computational Department of the Mathematical Centre in Amsterdam. Whatever my topic was going to be, it was clear that my job would be to program. There used to be one computer, the Electrologica X1. Shortly before my arrival a much faster and bigger successor was added: the X8 from the same manufacturer. The language was Algol 60. Most o
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