2、1945年,美籍匈牙利科学家冯·诺依曼(J.Von Neumann)提出的,是现代计算亮歼机的理论基础。现代计算机已经发展到第五代,但仍遵循着这个原理。
3、存储坦圆程序和程序控制原理的要点是,程序输入到计算机中,存储在内存储器中(存储原理),在运行时,控制器按地址顺序取出存放在内存储器中的指令(按地址顺序访问指令),然后分析指令,执行指令的功能,遇到转移指令时,则转移到转移地址,再按地址顺序访问指令(程序控制)。
仅供参考:what's so significant about a computer's ability to store
instructions? Take a moment to think about the way you use a simple handheld calculator to balance your checkbook each month. You're forced to do the calculations in stages. Although you can store data from one stage and use it in the next stage. you cannot store the sequence of formulas-the program required to balance your checkbook.
计算机缘何能够存储指令?首先,让我们看一下您每个月结算账单时所源碰使用的那枯森种简易计算器。使用这种计算器时,您必须按步就班的进行计算。虽然这种计算器可以将当前计算步骤中的结论存储起来,用于下一步计算,但是它无法存储一系列的计算公式--用于结算账单的程序。
Every month. therefore. you have to perform a similar set of
calculations. The process would be much simpler if your calculator remembered the set of calculations you needed to perform, and simply asked you for this month's checkbook entries.
每个月您都得重复进行类似计算。您要进行哪些计算,如果计算器能够将它们记住的话,您工作起来将事半功倍,只需输入当月账单上的原始数据就可以轻松搞定了。
Early "computers" were really no more than calculating devices, designed to carry out a specific mathematical task. To use one of these devices for a different task, it was necessary to rewire its circuits -a job best left to an engineer.
早期的“计算机”只是是雹败谈计算设备罢了,只能执行特定的数学计算。执行不同任务时,需要对其电路进行重写---这项工作一般由工程师完成。
In a modern computer. the idea of stored program means that a series of instructions for a computing task can be loaded into a computer's memory. These instructions can easily be replaced by a different set of instructions when it is time for the computer to perform another task.
现代计算机中的存储程序概念表示用于执行计算任务的指令序列可以载入计算机主存。当计算机执行不同任务时,不同指令序列可以轻松替换当前的指令序列,进行新的计算。
The stored program concept allows you to use your computer for one task, such as word processing,and then easily switch to a different type of computing task, such as editing a photo or sending an e-mail message. it is the single most important characteristic that distinguishes a computer from other simpler and less versatile devices, usch as calculators and pocketed-sized electronic dictionaries.
通过存储程序概念,您可以使用计算机进行字处理,也可以轻松切换到图像编辑或电子邮件发送等其它类型的计算任务。存储程序概念是区分计算机与计算器和袖珍电子词典等其它功能较简易的电子设备的唯一区别,同时也是最重要区别。
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