source: t29-www/en/miscellaneous.shtm @ 228

Last change on this file since 228 was 195, checked in by sven, 14 years ago

Siemens educational computer model translated:

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4<head><!--#set var="title"        value="Miscellaneous"
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8   --><!--#set var="prev_title"   value="Storage media"
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10   --><!--#set var="next_title"   value="Development Projects"
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12     <title>technikum29 - <!--#echo var="title" --></title>
13
14    <!--#include virtual="/en/inc/head.inc.shtm" -->
15    <meta name="t29.SVN" content="$Id: search.shtm 108 2009-08-19 17:20:00Z heribert $" />
16    <meta name="t29.thistranslation" content="12.11.2009" />
17    <meta name="t29.comment" content="Initial announcement" /> 
18</head>
19<body>
20<!--#echo encoding="none" var="heading" -->
21<div id="content">
22    <h2><!--#echo var="title" --></h2>
23
24    <h3>Pianola</h3>
25    <p>The technikum29 is quite versatile &ndash; beside all the communication
26       and computer technology we also show very special exhibits: This is
27       a fully executable pianola, year of manufacture about 1910-1915.</p>
28
29    <p>
30       It's a great experience see and hear such old jukeboxes, typically made
31       only of natural materials like leather, gum, wood, bone glue, felt, metal, paper,
32       ivory and glas.
33       <br/>By assembling these elements on an intelligent way, one could
34       build a simple mechanical machine which is especially impressive
35       for today's people. Here at the technikum29, we will show you how
36       this device works, we will explain the basic functionality and
37       play challenging compositions. While having covers removed, you can
38       even see the fascinating mechanics working.
39    </p>
40
41     <div class="box center">
42       <img src="/shared/photos/kommunikationstechnik/pianola.jpg"
43         alt="Picture of the Pianola" width="700" height="618" class="nomargin-bottom" />
44     </div>
45
46    <h3>Movie projector  "Dresden 1"</h3>
47
48     <div class="box left clear-after">
49        <img src="/shared/photos/kommunikationstechnik/kinomaschine.dresden1.jpg"
50           alt="Photography of the movie projector Dresden 1" width="350" height="630" />
51
52                <div class="bildtext">
53          <p>The technikum29 has a movie projector from 1951 (there are
54             more and even older projectors from the 1930s that are stored in the
55             archive for lack of space).</p>
56          <p>
57             Movie projectors have always been very complex devices. At that time,
58             the bright picture projection was archived with an arc light which was
59             generated between two carbon pencils. The waste heat was deflected via a
60             chimney pipe! <!-- stupid mode... -->
61             Since the pencils got shorter and shorter while the movie went on, they
62             had to be moved continously closer together for producing a constant
63             luminosity. Otherwise the light goes out.
64             <br/>We will repair this device to show an original newsreel from the 1960s.
65         </p>
66           </div>
67        </div>
68               
69        <h3 id="demo">Siemens Demonstration Computer</h3>
70        <div class="box center">
71        <img src="/shared/photos/rechnertechnik/siemens-democomputer.jpg" alt="Siemens demonstration educational computer CPU" width="700" height="587" />
72                <p class="center"><b>Siemens educational computer</b></p>
73        </div>
74
75        <p>This demonstration model was build in 1973, when personal computers were not
76           invented for a long time yet. Engineers had to be trained to understand
77           computer architectures. Therefore, this big education model was constructed.
78           It is a giant implementation of a typical register machine where 126 lamps
79           display all registers, control, ALU and RAM, including the data flow.
80           Featuring a mutable clock pulse and only 4 bit word with, elementary opcodes
81           could be reproduced in a very illustrative way. The device can be toggled to
82           process one instruction or one cycle a time.
83        <br>On the left side, the computer program could be directly "written" by plugging
84           cartidges labeled with assembly instruction mnemonics or numerical values
85           (immediate operands). On this cartiges the user could directly read the binary
86           value of the machine instruction which will be the content of the corresponding
87           random access field. As you might guess, the computer cannot change the program
88           memory without user interaction, so this model actually implements an Harvard
89           architecture, even though the (german) labels on the frontend suggest something
90           different.
91        <br>The picture above shows a currently running program that adds memory cells. It
92           shows that computer word lengths do not limit the length of proccessable
93           numbers.
94        <br>It is a wonderful device that can even be used today to understand the elementary
95           workflow of modern high end desktop CPUs.
96    </p>       
97       
98</div><!-- end of content -->
99<!--#include virtual="/en/inc/menu.inc.shtm" -->
100</body>
101</html>
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