Changeset 867 in t29-www for en


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Timestamp:
Oct 24, 2015, 11:26:15 PM (4 years ago)
Author:
heribert
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Bild eingebunden

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  • en/computer/early-computers.php

    r865 r867  
    5252A rotating disk serves as the machine's main memory and clock generator. It
    5353rotates with 1475 RPM and holds 4096 words of 32 bits each which equals 12 kB,
    54 a reasonable size back then. The disk contains 64 data tracks, four timing
    55 tracks and tracks for three registers (accumulator, instruction register and
    56 counter register). The mean write density is about 10 Bit/mm (about 1/200th of
    57 today's disk drives).<br> Here you can see a picture of the
    58 <a  class="popup" href="/shared/photos/rechnertechnik/lgp21-platte.jpg"><b>LGP-21 disk drive</b></a><br>
    59 
     54a reasonable size back then.
     55
     56<div class="box left">
     57<a  class="popup" href="/shared/photos/rechnertechnik/lgp21-platte.jpg">LGP-21 disk drive
     58                <img src="/shared/photos/rechnertechnik/lgp21-platte.jpg" width="300" height="270" alt="LGP-21 disk drive" /></a>
     59        </div>
     60<br>
     61The disk contains 64 data tracks, four timing tracks and tracks for three registers (accumulator, instruction register and
     62counter register).
     63The mean write density is about 10 Bit/mm (about 1/200th of
     64today's disk drives).<br>
    6065The LGP-21 supports 23 different instructions - enough to program typical
    6166scientific applications.<br>
     
    6469of this type helps a lot.
    6570
    66 More information about this interesting and rare system will follow.</p>
    67 
    68 
    69                
    70 </p>
     71More information about this interesting and rare system will follow.</p>               
     72
    7173
    7274       
    7375        <h3>Mini-Computers</h3>
    74        
     76
    7577    <p>Today's kids think of the latest mobile devices when talking about "mini computers".
    7678           In contrast, in the 1960s and the early 70s, a computer was always huge (like our
     
    182184                 
    183185        <h3 id="pdp8L">PDP-8L</h3>
     186        <br>
    184187        <div class="box desc-left borderless">
    185188                <img src="/shared/photos/rechnertechnik/dec/pdp-8L.jpg" width="400" height="360" alt="DEC PDP-8L" />
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