Changeset 876 in t29-www for en


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Timestamp:
Nov 13, 2015, 9:17:28 PM (4 years ago)
Author:
heribert
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Termine aktualisiert
Blog´s U9200 in small-Version

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  • en/computer/univac9200.php

    r868 r876  
    105105
    106106        <h3 id="blog">Restoration Blog (the first UNIVAC)</h3> 
    107         <p><b>17.01.2010:</b> There were some mice in the power supply and printer; they
     107        <p class="small"><b>17.01.2010:</b> There were some mice in the power supply and printer; they
    108108           bit thorugh some small cables.
    109         <p><b>16.02.2010:</b> After locating two defective resistors the power supply is
     109        <br><br><b>16.02.2010:</b> After locating two defective resistors the power supply is
    110110           running again. Now we can use punch card devices from the CPU. Actually
    111111           we cannot read nor punch data.
     
    121121                selected via switches.</p>
    122122        </div>
    123         <p><b>15.04.2010:</b> The boot process of the device is still crashing. There is
     123        <p class="small"><b>15.04.2010:</b> The boot process of the device is still crashing. There is
    124124            an error message from the printer without any reason. We are trying to
    125125                locate this error.
    126         <p><b>02.05.2010:</b> A broken thyristor (hammer driver) raised the
     126        <br><br><b>02.05.2010:</b> A broken thyristor (hammer driver) raised the
    127127            "printer error" message. Data integrity was the most important consideration at the
    128128                time. If only one of the 140 printer columns is not working correctly, the whole
    129129                printer goes offline to avoid any wrong output.
    130         <p><b>10.05.2010:</b> We managed to get the plated wire storage online. We
     130        <br>><br><b>10.05.2010:</b> We managed to get the plated wire storage online. We
    131131            can even start some small test programs via the input switches, but there are
    132132                bugs while running. This is perhaps the only device that still uses the old
    133133                plated wire storage. Anyway, we are planing a replacement.
    134         <p><b>12.06.2010:</b> After calibrating the optical card reader, we could read in
     134        <br><br><b>12.06.2010:</b> After calibrating the optical card reader, we could read in
    135135           and execute small programs in the data memory. We will report about the high
    136136           security level of the card reading process later. Surprisingly the plated wire
    137            storage still works.</p>
    138         <p><b>16.06.2010:</b> The card puncher doesn't work any more. 30 years of inactivity
     137           storage still works.
     138        <br><br><b>16.06.2010:</b> The card puncher doesn't work any more. 30 years of inactivity
    139139           are a long time for computers, too.
    140140           <br>On the other side, we could execute a printer loop program. The huge printer
    141            starts up, but doesn't print yet. After two minutes, a thermal fuse triggers.</p>
    142         <p><b>25.06.2010:</b> The fuse is triggerd by a broken centrifugal switch from the
     141           starts up, but doesn't print yet. After two minutes, a thermal fuse triggers.
     142           
     143        <br><br><b>25.06.2010:</b> The fuse is triggerd by a broken centrifugal switch from the
    143144           printer engine start-up windings. Therefore the winding was always on and
    144145           constantly dissipated current. Now the engine is running, but print commands
    145146           are not yet executed.
    146147           <br>We also found a bug in the memory. Now all 8kB seem to run completely
    147            error-free.</p>
    148         <p><b>30.06.2010:</b> We located another bug in the printer logic (faulty
     148           error-free.
     149        <br><br><b>30.06.2010:</b> We located another bug in the printer logic (faulty
    149150           transistor). For the first time in 30 years, the bar printer works and is capable of
    150151           printing files from various punch cards. The type face looks good.
    151            <br>Now we turn to the damaged printer.</p>
    152         <p><b>05.08.2010:</b> After replacing a broken transistor and injecting some oil,
     152           <br>Now we turn to the damaged printer.
     153           <div class="desc-right">
     154                <img src="/shared/photos/rechnertechnik/univac/messen-am-memory.jpg"  width="400" height="313" />
     155                <p class="bildtext" style="width: 400px;"><b>Backside of the UNIVAC 9300:</b> With a storage oscilloscope and a logic analyzer logic states are measured</p></div>
     156           
     157        <p class="small"><b>05.08.2010:</b> After replacing a broken transistor and injecting some oil,
    153158           the puncher is up and running! Now we are able to dublicate punch cards.
    154159           Unfortunately we had to disable the error checking functions since the device
    155160           detected a non-existing error when punching. Locating this error is the next
    156            problem.</p>
    157         <p><b>26.08.2010:</b> Locating the bug in the device's internal error checking
     161           problem.
     162           
     163        <br><br><b>26.08.2010:</b> Locating the bug in the device's internal error checking
    158164           of punched data was hard work. The computer compares the data which should be
    159165           punched with the position of the hammers in the punch station in a very
     
    165171           After this repair, all duplicated punch cards are checked too. If there
    166172           is a wrong punch hole, the computer stops immediately (an event that occurs
    167            extremely rarely now).</p>
     173           extremely rarely now).
    168174           
    169            <div class="desc-right">
    170                 <img src="/shared/photos/rechnertechnik/univac/messen-am-memory.jpg"  width="400" height="313" />
    171                 <p class="bildtext" style="width: 400px;"><b>Backside of the UNIVAC 9300:</b> With a storage oscilloscope and a logic analyzer logic states are measured</p></div>
    172 
    173         <p><b>19.10.2010:</b> After all test programs were run successfully, we can now declare
     175        <br><br><b>19.10.2010:</b> After all test programs were run successfully, we can now declare
    174176the machine as being fully operational. The next step will be constructing a
    175177new memory system which is necessary since the original plated wire memory is
    176178fragile and it is doubtful that it would survive the years to come without
    177 errors.</p>
     179errors.
    178180
    179 
    180 <p><b>Feb. 2012:</b> Redesigning the memory using modern semiconductor circuits is more complicated
     181<br><br><b>Feb. 2012:</b> Redesigning the memory using modern semiconductor circuits is more complicated
    181182than expected initially. Despite a lot of effort concerning the timing of
    182183all signals involved in the RAM's logic the new RAM card is still not working.
    183184Further tests and modifications will be necessary. Fortunately the original
    184 wire memory is still working perfectly.</p>
     185wire memory is still working perfectly.
    185186
    186         <p><i>This blog will be irregulary continued.</i></p>
     187        <br><br><i>This blog will be irregulary continued.</i>
     188        <hr>
    187189       
    188190<p class="small">We would like to thank Dr. Frank Berger and Dr. Juergen Steen (both from the
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