Pocket calculators, designed originally to assist accountants and engineers, are rapidly becoming everyman's instant genie. Worldwide sales of these minicomputers are expected to top 13 million this year and are growing in the U.S. alone at the rate of 400% annually. As prices drop (one model was selling for only $22 last week), consumers are snapping them up to check cost-per-unit prices at the supermarket, balance checkbooks, figure out tax returns and do their schoolwork. But all work and no play makes even a calculator a dull gimmick, and now the little machines...
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