By F. H. George (Auth.)
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Extra info for An Introduction to Digital Computing
This is obviously not enough information. Return to 42 and try again 52 from 50 SVB/A/B/C means "subtract B from A and place result in C". Similarly, mv/A/B/C means "divide A by B and place result in C". So the programme is, by inference, ADO/A/B/A ΑΌΌ/A/C/A S\JB/A/D)A mv/A/E/A What does OIV/A/B/C mean? Go to 56 12 from 61 Seven registers, you say. Now we have 200(4) 201(5) 202(2) 203(20) 204 (the result of adding 4 to 5) 205 (the result of multiplying contents of 204 by 2) 206 (the result of subtracting contents of 205 from 20).
Take away 15 and divide the result by 5. It is an easy problem which you could do in your head, but we will show you how to programme a computer to do it for you. What is the final arithmetic answer? 43. 40. 47. 9. 12 from 44 Now the instructions are : 1. ADD contents of B to contents of A and place the answer in A. ) 2. Now ADD contents of C to contents of A, and place answer in A again. 3. Now SUBTRACT contents of D from contents of A, and place answer in A. 4. Now DIVIDE contents of A by contents of E, and place the answer in A.
Now remember that address A contains the number 1, address B the number 2 and address C the number 3. 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.
An Introduction to Digital Computing by F. H. George (Auth.)