Changeset 344 in t29-www


Ignore:
Timestamp:
Mar 5, 2013, 9:09:33 PM (6 years ago)
Author:
heribert
Message:

Demo-Computer (Siemens) war auf der englischen Seite doppelt. In Miscellaneous gelöscht.

Files:
2 edited

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  • de/lernprojekte/index.php

    r295 r344  
    5757
    5858<table>
    59 <tr><th><a href="pianola">Pianola</a>          <td>Funktionsbeschreibung der Pianola und Entwurf einer Präsentation
     59<tr><th><a href="pianola">Pianola</a>          <td>Funktionserklärung und Entwurf einer Präsentation
    6060<tr><th><a href="schach">Schach</a>            <td>Anleitung für ein Schachspiel gegen den PDP 8 Computer mit 8KB Arbeitsspeicher (freier Zugriff, kein Passwort erforderlich)
    6161<tr><th><a href="speichermedien">Speichermedien</a>   <td>Entwurf einer Präsentation über historische Speichermedien
  • en/miscellaneous.php

    r287 r344  
    100100        </div>
    101101               
    102         <h3 id="demo">Siemens Demonstration Computer</h3>
    103         <div class="box center">
    104         <img src="/shared/photos/rechnertechnik/siemens-democomputer.jpg" alt="Siemens demonstration educational computer CPU" width="700" height="587" />
    105                 <p class="center"><b>Siemens educational computer</b></p>
    106         </div>
    107 
    108         <p>This demonstration model was build in 1973, when personal computers were not
    109            invented for a long time yet. Engineers had to be trained to understand
    110            computer architectures. Therefore, this big education model was constructed.
    111            It is a giant implementation of a typical register machine where 126 lamps
    112            display all registers, control, ALU and RAM, including the data flow.
    113            Featuring a mutable clock pulse and only 4 bit word with, elementary opcodes
    114            could be reproduced in a very illustrative way. The device can be toggled to
    115            process one instruction or one cycle a time.
    116         <br>On the left side, the computer program could be directly "written" by plugging
    117            cartidges labeled with assembly instruction mnemonics or numerical values
    118            (immediate operands). On this cartiges the user could directly read the binary
    119            value of the machine instruction which will be the content of the corresponding
    120            random access field. As you might guess, the computer cannot change the program
    121            memory without user interaction, so this model actually implements an Harvard
    122            architecture, even though the (german) labels on the frontend suggest something
    123            different.
    124         <br>The picture above shows a currently running program that adds memory cells. It
    125            shows that computer word lengths do not limit the length of proccessable
    126            numbers.
    127         <br>It is a wonderful device that can even be used today to understand the elementary
    128            workflow of modern high end desktop CPUs.
    129     </p>       
     102       
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