Mainframe computers had multiply instructions, but they did the same sorts of shifts and adds as a "multiply routine".Įarly microprocessors also had no multiply instruction. Which repeatedly shifts and accumulates partial results, However, until the late 1970s, most minicomputers did not have a multiply instruction, and so programmers used a "multiply routine" Crucially during this period he studied for a PhD degree at the University of Manchester, where he worked on the design of the hardware multiplier for the early Mark 1 computer. Between 19 Arthur Alec Robinson worked for English Electric Ltd, as a student apprentice, and then as a development engineer.
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