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Chapter XV Electronic Data Processing and Source Data System
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Source Data System
Figure 15-1.-A personal computer system. valve that controls the flow of steam to a turbine generator or a temperature setting to control the ovens  in   the   ship’s   galley   for   baking.   Analog computers are also used for controlling processes. To do so, they must convert analog data to digital form,  process  it,  and  then  convert  the  digital results back to analog form. Digital   computers   can   process   data   more accurately   than   analog   computers,   but   analog computers  can  process  data  faster  than  digital computers. Some computers combine the functions  of  both  analog  and  digital  computers, and are known as hybrid computers. As  a  PN,  you  will  probably  never  work  with analog computers since they are not designed for administrative data processing applications. Digital Computers Digital   computers   perform   arithmetic   and logic  functions  on  separate   discrete   data,   like numbers,  or  combinations  of  discrete  data,  such as  name,  rate,  and  division.  This  makes  them different  from  analog  computers,  which  operate on  continuous  data,  like  measuring  temperature changes. As a rule, digital computers are used for business and scientific data processing. They may be either special or general-purpose. WORD PROCESSING SOFTWARE You can use word processing software for any function   that   involves   text,   such   as   letters, memorandums, forms, and reports. You could  be using microcomputers (fig. 15-1) to perform any of these functions. At   a   minimum,   computers   are   used   for creating, editing, storing, retrieving, and printing text. Under the word processing software control, you generally enter the text on the keyboard and it  is  displayed  on  a  screen  (fig.  15-2).  Then  the material  may  be  changed  (edited),  stored  on  a disk or tape, or printed on a printer. When    you    use    a  computer  for  a  word processing   job,   you   can   change   material   by adding   or   deleting   words,    characters,    lines, sentences,    or  paragraphs.    You  can  rearrange text    by    moving    a    paragraph    or    block    of information    to    another    place    in    the    same document  or Figure 15-2.-Word Processing example. 15-2

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