说明：掌上个人数字处理系统，实现通讯录、日历、计算器、电子画板功能。
Handheld personal digital processing system, realize the mail list, calendar, calculator, electronic drawing board function.
电子计算器是一种典型的大规模数字集成电路，主要由微处理器和外围的显示电路、键盘接口电路等组合而成。
Calculator chip is a typical kind of digital large scale integrated circuit. It consists of microprocessor and peripheral display diver and keyboard interface circuit.
电子计算器是一种典型的大规模数字集成电路，主要由微处理器和外围的显示电路、键盘接口电路等组合而成。
Calculator chip is a typical kind of digital large scale integrated circuit. It consists of microprocessor and peripheral display diver and keyboard interface circuit.
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