By F. H. George (Auth.)
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Extra resources for An Introduction to Digital Computing
Although a digital computer is electronic and automatic, and it represents l's and O's by electronic pulses, and usually uses electronic or magnetic stores, it can be thought of in many different ways. As one analogy, we recommend that the reader thinks of a filing cabinet with a desk calculator inside one of the files. When the reader is thinking of the automatic operation of the computer he should have in mind something like a railway system which is automatically controlled by signals. A desk calculator is manual and not automatic.
Now, do we have to place both the instructions and the numbers in store before the computer operates?
How many different digits are there in binary code? Think of the answer, then turn to 42 12 from 33/37 False is the correct answer. A desk calculator is manual. It is, in effect, an arithmetic unit which could be said to store the numbers as you calculate with them, but a computer stores numbers and instructions. No system could be automatic without a store. The fact of having a store is no guarantee that it will be automatic, but if the system contains both instructions and data (numbers), then it may operate over a period of time without human interference and it is this property we call "automatic".