By F. H. George (Auth.)
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Additional info for An Introduction to Digital Computing
Now go to 38 37 from 33 No, it is quite true. A desk calculator is not automatic because it has no store. At least it can store, in a sense, only the numbers it has immediately in its arithmetic unit. Certainly without an infor mation store, no system whatever could be automatic. 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.
This is vital because the computer must work automatically. A digital computer is automatic by virtue of being able to store a great deal of information involving both instructions and numbers. If it had no store, it could not be automatic. Is this last statement true or false? 59. False. 62. True. 12 from 52 Όΐν/A/B/C means "divide the number in address A by the number in B and put the result in C". If we now use the codes 01 for ADD 02 for SUB 04 for Div (03 would now be saved for multiply, or MUL), we can now present the coded programme in the form 0Ì/A/B/A 0Ì/A/C/A 02/A/D/A 04/A/E/A and further instructions for PRINT and STOP.
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. 5. PRINT out the contents of A. ) Proceed to 48 12 from 43/45 9 is the correct answer. Now imagine the following simple computer having storage registers with addresses A, B, C, D and E for numbers.
An Introduction to Digital Computing by F. H. George (Auth.)