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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-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>
17   
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>
24               
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>
32       
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>
35
36
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>
50               
51               
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>
58               
59                <p class="small">
60               
61                <b>Dec.2013:</b>  Cleaning the machine and removing disintegrated foam rubber mats.<br><br>
62               
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>
66               
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>
71               
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>
75               
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>
81               
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>
85               
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>
92
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.<br><br>
100
101<b>16.6.2014:</b> Giant leaps: After an intensive cleaning effort with adjustments following,
102the card reader IBM 1442 is now fully operational and we could successfully
103run the seven so-called "One-Card-Diagnostic" programs. This demonstrated
104that the CPU is at least basically operating (since these tests are quite
105simple in nature they can not detect subtle faults).<br>
106The next test involved the console printer: A working console printer is necessary to communicate
107with the machine - unfortunately, this test showed that the printer is still
108faulty. Currently, we suspect resinified oil as the culprit. <br><br>
109
110<b>31.08.2014:</b> We would like to thank the people from the "Verein fuer ein Museum
111der Lochkartentechnik", cosecans.ch, who donated a set of plug in cards
112for the IBM 1131 processor. Without these spares our repair attempts would be
113next to impossible due to the SLT technology.<br>
114 Further tests showed that memory and CPU test run flawlessly but the
115keyboard/printer-test still fails.<br><br>
116
117<b>07.09.2014:</b> We experienced some set-backs during our initial restoration
118attempts. This was not that unexpected since the machines have been sitting
119idle for several decades. We have at least two different problems in the
120machine. Without diagnostic programs, any repair attempt would be in vain. Just
121the keyboard/printer test shows two errors:<br>
122
1231) After running for some time, the attempt to read programs from punched cards
124will print out "E0004   CKSUM" on the console typewriter which denotes a
125checksum error; the checksum stored on the card differs from that computed by
126the CPU based on the data read. Possible causes for this type of error are
127missing/wrongly placed cards, reader errors or a CPU error. The first
128possibility can be ruled out, so the error is either in the reader or in the
129CPU.<br>
130
1312) The second error we experience is "E0001   INVLD" denoting an erroneous
132address in the switch register for that particular test. Unfortunately the
133address set on the switches is correct so another problem is still lurking in
134the machine.
135
136
137                </small>
138                <p><em>This section will be gradually continued.</em></p>
139               
140               
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