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2        $seiten_id = 'ibm1130';
3        $version = '$Id: ibm1130.php 271 2013-04-23 19:23:24Z heribert $';
4        $titel = 'IBM 1130 Computing System';
6        require "../../lib/technikum29.php";
9        <h2 id="ibm1130"><b>IBM 1130</b>  &nbsp;  Computing System</h2>
11<div class="box center clear-after">
12                <img src="/shared/photos/rechnertechnik/ibm-3register.jpg"  width="859" height="186" />
13        </div> 
14        <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>
15                The "AMPEX TMZ" (digital tape memory system) is connected to the equipment, so we are urgently looking for Manuals (schematics).<br>
16There 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>
18        <div class="box center clear-after">
19                <img src="/shared/photos/rechnertechnik/ibm-1130.jpg" alt="IBM 1130 Elektronische Rechenanlage" width="700" height="603" />
20                <div class="bildtext">
21                <p><b>IBM 1130</b></p>
22                </div>
23                <br><br>
25<div class="desc-left borderless no-copyright">
26                        <a class="popup" href="/shared/photos/rechnertechnik/facit4000.jpg">
27                                <img src="/shared/photos/rechnertechnik/facit4000.jpg" alt="Lochstreifengeräte" width="352" height="137" />
28                        </a>
29                        <p class="small"><a class="popup" href="/shared/photos/rechnertechnik/facit4000.jpg"><b>Facit paper tape devices</b></a>:<br>
30                        Rewinder type 4015, punch type 4060, reader type 4001 and punch electronics type 5104
31                </div>
33                <p>The picture on the left hand side shows the paper tape devices of the Facit 4000 series that were connected to the system.
34<div class="clear"></div>
37<h3 id="blog-ibm">Restauration-Blog</h3>
38                <p class="small">
39                As we did for the restoration of the UNIVAC 9200, we will again have a repair
40blog for the IBM 1130. The main problem here is due to the rather special
41technology employed by IBM, the so-called SLT (Solid Logic Technology). The
42circuit elements are small ceramic tiles with discrete transistors, resistors
43etc. which thus form an equivalent to an integrated circuit. The problem is
44that these elements and boards are no longer available. So the very advanced
45technology of IBM makes it hard to maintain these old machines today.<br>
46In the same time other companies like BULL still used discrete transistors mounted
47on large circuit boards. Worlds colliding... Such a restoration process is
48extremely time consuming and cumbersome and maybe we wouldn't start it at all
49if we knew in advance how many bugs there are to resolve.</p><br>
52                <div class="desc-left">
53                <a class="popup" href="/shared/photos/rechnertechnik/ibm-1130-board.jpg">
54        <img src="/shared/photos/rechnertechnik/ibm-1130-board.jpg" alt="Modul der IBM1130" width="195" height="247" /></a>
55        <p class="small">Typical <a class="popup" href="/shared/photos/rechnertechnik/ibm-1130-board.jpg"><b>SLT-module</b></a>.
56        The IBM circuit diagram was printed on high-speed printers.
57        <br>Disadvantage: heavy to read because all logic elements look identical.</p></div>
59                <p class="small">
61                <b>Dec.2013:</b>  Cleaning the machine and removing disintegrated foam rubber mats.<br><br>
63                <b>30.12.2013:</b> Due to curiosity we already invested much time. After installing
6432 kB memory (with a word length of 16 bits) the first power on was attempted: No magic smoke escaping - a big success! Nevertheless, the console typewriter banged its type head
65repeatedly at the left margin so we switched off quickly.<br><br>
67                <b>2.1.2014:</b> Removal of the console typewriter for easier maintenance. After
68three hours the bug was found: Four small bars, moved by springs, were
69immovable due to old oil which had solidified. Correction was simple due to
70some W40.<br><br>
72                <b>4.1.2014:</b> Since the console typewriter is now working flawless, we
73concentrated on writing data to the memory system. At first sight, the memory
74is working a "bit".<br><br>
76                <b>6.1.2014:</b> After we have learned how to deposit data to the memory and read it
77back, it became clear that there are at least two problems: 1: Depositing
78values in consecutive memory addresses fails, and 2: two out of 15 bits are
79missing at all, causing parity errors.<br>
80                <br><br>
82                <b>8.1.2014:</b> The second error was found rather quickly: One "head connector" was
83missing from the second memory module. We fail to understand how such an item
84can get lost. The first error is harder to find.<br><br>
86                <b>11.1.2014:</b> The first error turns out to be a show-stopper: The address
87generation is working fine but the driver for the address lines 11, 12, 13,
88and 14 is missing since there is no board 7342! Somehow this has been removed
89from the machine! That is the worst case for every restoration project! A
90closer inspection revealed, that a second board, 4628, is also missing from
91the printer control. <br><br>
93<b>7.6.2014:</b> The card 7432 we are looking for is only used in systems with a memory
94expansion. These mainframes are much rarer than the smaller IBM 1130 systems
95without the additional left enclosure. Therefore both, the card missing in
96out machine as well as its schematics have apparently not been preserved.
97Accordingly, we reverse-engineered the circuit diagram based on measurements
98on an existing card and rebuilt the card. Now the core memory of our IBM 1130
99is working like a charm which is a significant milestone.
101                </small>
102                <p><em>This section will be gradually continued.</em></p>
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