1 | <?php |
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2 | $seiten_id = 'ibm1130-blog'; |
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3 | $version = '$Id'; |
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4 | $titel = 'IBM 1130 Reparation Blog'; |
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5 | |
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6 | require '../../lib/technikum29.php'; |
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7 | ?> |
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8 | |
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9 | <h2>IBM 1130 Reparation Blog, continuation</h2> |
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10 | |
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11 | <br> |
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12 | |
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13 | The beginning you'll find here <a href="/en/computer/ibm1130.php#blog-ibm"> <b>IBM-Blog, start</b> </a> |
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14 | <br><br> |
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15 | |
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16 | <b>7.6.2014:</b> The card 7432 we are looking for is only used in systems with a memory |
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17 | expansion. These mainframes are much rarer than the smaller IBM 1130 systems |
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18 | without the additional left enclosure. Therefore both, the card missing in |
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19 | out machine as well as its schematics have apparently not been preserved. |
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20 | Accordingly, we reverse-engineered the circuit diagram based on measurements |
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21 | on an existing card and rebuilt the card. Now the core memory of our IBM 1130 |
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22 | is working like a charm which is a significant milestone.<br><br> |
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23 | |
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24 | <div class="desc-left"> |
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25 | <a class="popup" href="/shared/photos/rechnertechnik/1130-reparatur.jpg"> |
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26 | <img src="/shared/photos/rechnertechnik/1130-reparatur.jpg" alt="1130 während der Reparatur" width="391" height="269" /></a> |
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27 | <p class="small">So it looks while repairing. Invisible: Measuring Park and many simultaneously opened Manuals.<br> |
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28 | Enlarge: click on picture!</p></div> |
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29 | |
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30 | <b>16.6.2014:</b> Giant leaps: After an intensive cleaning effort with adjustments following, |
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31 | the card reader IBM 1442 is now fully operational and we could successfully |
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32 | run the seven so-called "One-Card-Diagnostic" programs. This demonstrated |
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33 | that the CPU is at least basically operating (since these tests are quite |
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34 | simple in nature they can not detect subtle faults).<br> |
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35 | The next test involved the console printer: A working console printer is necessary to communicate |
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36 | with the machine - unfortunately, this test showed that the printer is still |
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37 | faulty. Currently, we suspect resinified oil as the culprit. <br><br> |
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38 | |
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39 | <b>31.08.2014:</b> We would like to thank the people from the "Verein fuer ein Museum |
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40 | der Lochkartentechnik", cosecans.ch, who donated a set of plug in cards |
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41 | for the IBM 1131 processor. Without these spares our repair attempts would be |
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42 | next to impossible due to the SLT technology.<br> |
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43 | Further tests showed that memory and CPU test run flawlessly but the |
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44 | keyboard/printer-test still fails.<br><br> |
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45 | |
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46 | <b>07.09.2014:</b> We experienced some set-backs during our initial restoration |
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47 | attempts. This was not that unexpected since the machines have been sitting |
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48 | idle for several decades. We have at least two different problems in the |
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49 | machine. Without diagnostic programs, any repair attempt would be in vain. Just |
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50 | the keyboard/printer test shows an error:<br> |
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51 | |
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52 | "E0001 INVLD" denoting an erroneous |
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53 | address in the switch register for that particular test. Unfortunately the |
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54 | address set on the switches is correct so another problem is still lurking in |
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55 | the machine.<br><br> |
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56 | |
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57 | |
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58 | <p><b><em>This section will be gradually continued.</em></b></p> |
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59 | |
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