The Digital Computer by K. C. Parton and P. Hammond (Auth.)

By K. C. Parton and P. Hammond (Auth.)

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4) Several of the large 42 AUTOMATIC PROGRAMMING computer manufacturers now have this available on their machines, but unfortunately it has so far not been possible to derive an acceptable general ALGOL system so that each manufacturer has proceeded with his own version of "ALGOL" which is not completely compatible with others. There are also many automatic programmes written for the smaller and slower computers which operate on the same principles but with unavoidable limitations. , to be carried out by simple generalised instructions.

NUMBERS Any elementary counting machine, such as a crib board or a digital computer, works with some basic marker being either absent or present. For example, on the crib board, number 5 would be stored as a marker five places from the start, and adding 2 would be done by placing a second marker a further two holes along, thus making the total 7. Such a process would, however, be prohibitive for large numbers, and thus the digital computer uses these markers in a different way. 53 THE DIGITAL COMPUTER Basically, if there is only one hole (or location) and one marker, then we can represent two numbers, either a 0 if the marker is absent or 1 if the marker is present.

CarcTfile for commercial autocode version of TA 227. £X ROOT 2 / ROOT REftL 1 •3 DUMMY NAME FILE OUTLINE FILE /recoup HËAOI/4& PfiiNT C 8 COEFFl 1 / [ CARD INPUT •z •/ r •/ JL 7 LEVEL Π 1 RUN THE DIGITAL COMPUTER arranged, secondly, the working file to establish in the computer what variables are needed during the calculation, and, thirdly, a print file is needed to describe how the output is to be arranged. Figure 17 shows the input form for the description of the general card file. e. A, B and C.

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