By F. H. George (Auth.)
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Extra info for An Introduction to Digital Computing
Let us store the result of the first addition in the store with address D and the final result in the store with address E. Now that we have allocated all the stores that we need for our numbers, code the two ADD instructions in the form that we have already used. Turn to 35 12 from 40 An address is the name of the location, in store, of a number or an instruction. Look at this very simple block diagram of a digital com puter: Input T Arithmetic Unit Control Unit Store I Output This is almost the simplest possible representation of a complete digital computer.
Go to 40 12 from 36 This is the end of our first chapter which has simply outlined the simplest relationship between the input and the store and the arithmetic unit. The control carries out the instructions and transfers numbers from store into the arithmetic unit, to be operated upon, and then transfers the results back into store. The computer operates automatically, and represents both numbers and instructions (these are both called computer words) in binary code, a language of O's and l's. The computer also has an input and an output, and for this purpose usually uses punched cards or punched tape.
Programming is a specialized and skilled job. What would you say, in general terms, a programmer had to do? Turn to 55 58 from 53 Two registers will be needed merely for the instructions and eight for the numbers, so two will not be enough, since both instructions and numbers need registers with their own addresses. Return to 53 59 from 55 No. It is true. The point is that a computer can store both numbers and instructions, and this is what distinguishes it as being automatic. Turn to 62 60 from 61 Twelve, you say.