Changeset 195 in t29-www
- Timestamp:
- Sep 10, 2010, 1:19:00 AM (14 years ago)
- Location:
- en
- Files:
-
- 2 edited
Legend:
- Unmodified
- Added
- Removed
-
en/miscellaneous.shtm
r184 r195 46 46 <h3>Movie projector "Dresden 1"</h3> 47 47 48 <div class="box left ">48 <div class="box left clear-after"> 49 49 <img src="/shared/photos/kommunikationstechnik/kinomaschine.dresden1.jpg" 50 50 alt="Photography of the movie projector Dresden 1" width="350" height="630" /> 51 </div>52 51 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> 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> 66 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 67 98 </div><!-- end of content --> 68 99 <!--#include virtual="/en/inc/menu.inc.shtm" --> -
en/news.shtm
r184 r195 17 17 <link href="http://page2rss.com/rss/15c37d8c11d3729e650502a0881277e4" title="Get a nifty RSS feed from this list" type="application/rss+xml" rel="alternate" /> 18 18 <meta name="t29.SVN" content="$Id$" /> 19 <meta name="t29.comment" content="13.07.09: Neu" />20 19 </head> 21 20 <body> … … 28 27 29 28 30 <ul class="news-feed"> 31 <li><h3>June 2010</h3> 32 We are writing an ongoing <a href="/en/computer/univac9200.shtm#blog">Blog about the UNIVAC 9300 reparation</a>. 33 </li> 29 <ul class="news-feed"> 30 <li><h3>September 2010</h3> 31 32 <div class="box left clear-after"> 33 <a href="/en/miscellaneous.shtm#demo"><img src="/shared/photos/rechnertechnik/siemens-demo.jpg" width="350" height="293" alt="Siemens educational Computer demonstration CPU model"/></a> 34 <p class="bildtext"> 35 We got a big <a href="/en/miscellaneous.shtm#demo" class="go">educational computer model</a> made by Siemens from 1973.</p> 36 </p> 37 </div></li> 38 39 <li><h3>June 2010</h3> 40 We are writing an ongoing <a href="/en/computer/univac9200.shtm#blog">Blog about the UNIVAC 9300 reparation</a>. 41 </li> 34 42 35 43
Note: See TracChangeset
for help on using the changeset viewer.