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1<?php
2        $seiten_id = 'ibm1130';
3        $version = '$Id: ibm1130.php 271 2013-04-23 19:23:24Z heribert $';
4        $titel = 'IBM 1130 Computing System';
5       
6        require "../../lib/technikum29.php";
7?>
8   
9        <h2 id="ibm1130"><b>IBM 1130</b>  &nbsp;  Computing System</h2>
10
11    <div class="box center clear-after">
12                <img src="/shared/photos/rechnertechnik/ibm-1130.jpg" alt="IBM 1130 Elektronische Rechenanlage" width="700" height="603" />
13                <div class="bildtext">
14                <p><b>IBM 1130</b></p>
15                </div>
16                <br><br>
17                <p>Since December 2013, we own a very nice and also quite interesting "Electronic Computing System" by IBM. This type was delivered for the first time in 1965 and intended for use by scientists, engineers, and mathematicians.<br>
18                The "AMPEX TMZ" (digital tape memory system) is connected to the equipment, so we are urgently looking for Manuals (schematics).<br>
19There is much to report about, but in first place the optical and electronical restoration of the Computer have to be realized.<br> This section will be continued within a short time.</p><br>
20
21<h3 id="blog-ibm">Restauration-Blog</h3>
22                <p class="small">
23                As we did for the restoration of the UNIVAC 9200, we will again have a repair
24blog for the IBM 1130. The main problem here is due to the rather special
25technology employed by IBM, the so-called SLT (Solid Logic Technology). The
26circuit elements are small ceramic tiles with discrete transistors, resistors
27etc. which thus form an equivalent to an integrated circuit. The problem is
28that these elements and boards are no longer available. So the very advanced
29technology of IBM makes it hard to maintain these old machines today.<br>
30In the same time other companies like BULL still used discrete transistors mounted
31on large circuit boards. Worlds colliding... Such a restoration process is
32extremely time consuming and cumbersome and maybe we wouldn't start it at all
33if we knew in advance how many bugs there are to resolve.</p><br>
34               
35               
36                <div class="desc-left">
37                <a class="popup" href="/shared/photos/rechnertechnik/ibm-1130-board.jpg">
38        <img src="/shared/photos/rechnertechnik/ibm-1130-board.jpg" alt="Modul der IBM1130" width="195" height="247" /></a>
39        <p class="small">Typical <b> SLT-module </b>. The IBM circuit diagram was printed on high-speed printers.<br>Disadvantage: heavy to read because all logic elements look identical. <br>Enlarge: click on picture!</p></div>
40               
41                <p class="small">
42               
43                <b>Dec.2013:</b>  Cleaning the machine and removing disintegrated foam rubber mats.<br><br>
44               
45                <b>30.12.2013:</b> Due to curiosity we already invested much time. After installing
4616 kW memory (with a word length of 16 bits it is equivalent to 32 kB) the first power on was attempted: No magic smoke escaping - a
47big success! Nevertheless, the console typewriter banged its type head
48repeatedly at the left margin so we switched off quickly.<br><br>
49               
50                <b>2.1.2014:</b> Removal of the console typewriter for easier maintenance. After
51three hours the bug was found: Four small bars, moved by springs, were
52immovable due to old oil which had solidified. Correction was simple due to
53some W40.<br><br>
54               
55                <b>4.1.2014:</b> Since the console typewriter is now working flawless, we
56concentrated on writing data to the memory system. At first sight, the memory
57is working a "bit".<br><br>
58               
59                <b>6.1.2014:</b> After we have learned how to deposit data to the memory and read it
60back, it became clear that there are at least two problems: 1: Depositing
61values in consecutive memory addresses fails, and 2: two out of 15 bits are
62missing at all, causing parity errors.<br>
63                <br><br>
64               
65                <b>8.1.2014:</b> The second error was found rather quickly: One "head connector" was
66missing from the second memory module. We fail to understand how such an item
67can get lost. The first error is harder to find.<br><br>
68               
69                <b>11.1.2014:</b> The first error turns out to be a show-stopper: The address
70generation is working fine but the driver for the address lines 11, 12, 13,
71and 14 is missing since there is no board 7342! Somehow this has been removed
72from the machine! That is the worst case for every restoration project! A
73closer inspection revealed, that a second board, 4628, is also missing from
74the printer control. We are now looking desperately for replacement boards or
75at least the schematics. If you can help, please let us know!  (Pictures
76of the missing boards can be found in the "Wanted" area of this web site.)
77               
78                </small>
79                <p>Continuation follows</p>
80               
81               
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