Download An Introduction to Digital Computing by F. H. George (Auth.) PDF

By F. H. George (Auth.)

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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.

False. 40. True. 34 from 28 The one instruction would have to tell you to add twice. In general, although we only need the single instruction word to add, we have to use it twice. So we have to say ADD 1 to 2 and ADD (1 + 2) to 3 meaning this to be carried out by two instructions. Go to 30 35 from 30 ΑΌΌ/A/B/D ΑΌΌ/D/C/E What number have we now got in ΕΊ Go to 33 12 from 31 General view of a digital computer. T. 1301 computer with card reader, card punch, paper tape reader and paper tape punch. The magnetic tape store is on the right of the picture.

01/10/11/12. 49. 01/10/11/12. 51. 1. 01. 43 from 45 No. 8 + 12 = 20 20 + 40 = 60 60 - 15 = 45 45 ■+- 5 = 9 You probably made your mistake on the last step and said 45 - 5 = 40. Turn to 47 12 from 47 [(8 + 12) +40] - 15 5 It is easy to see the correct sequence of operation: (1) (2) (3) (4) 8 + 12 20 + 40 60 - 15 45 -*- 5 = = = 20 60 45 9 Then the computer can be made to print out the answer 9, but leave that for now. Write down next the computer instructions of our problem (not in coded form, but ordinary language).

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