Empire of the Sum: The Rise and Reign of the Pocket Calculator. By Keith Houston. W.W. Norton & Company; 384 pages; $32.50. To be published in Britain in October; £25 WHEN WAS the last time you used a ...
Clive Sinclair, who invented the Sinclair ZX Spectrum, an early personal computer, died of cancer Thursday at age 81, his family confirmed. Sinclair was an inventor with an impressive list of ...
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