Index: en/computer/ibm1130.php
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There is much to report about, but in first place the optical and electronical restoration of the Computer have to be realized.
This section will be continued within a short time.
+ As we did for the restoration of the UNIVAC 9200, we will again have a repair
+blog for the IBM 1130. The main problem here is due to the rather special
+technology employed by IBM, the so-called SLT (Solid Logic Technology). The
+circuit elements are small ceramic tiles with discrete transistors, resistors
+etc. which thus form an equivalent to an integrated circuit. The problem is
+that these elements and boards are no longer available. So the very advanced
+technology of IBM makes it hard to maintain these old machines today.
+In the same time other companies like BULL still used discrete transistors mounted
+on large circuit boards. Worlds colliding... Such a restoration process is
+extremely time consuming and cumbersome and maybe we wouldn't start it at all
+if we knew in advance how many bugs there are to resolve.
Typical SLT-module . The circuit diagram IBM was printed on speed printers. Disadvantage: heavy to read because all logic elements look identical.
Enlarge: click on picture!
+
+ Dec.2013: Cleaning the machine and removing disintegrated foam rubber mats.
+
+ 30.12.2013: Due to curiosity we already invested much time. After installing
+16 kB memory the first power on was attempted: No magic smoke escaping - a
+big success! Nevertheless, the console typewriter banged its type head
+repeatedly at the left margin so we switched off quickly.
+
+ 2.1.2014: Removal of the console typewriter for easier maintenance. After
+three hours the bug was found: Four small bars, moved by springs, were
+immovable due to old oil which had solidified. Correction was simple due to
+some W40.
+
+ 4.1.2014: Since the console typewriter is now working flawless, we
+concentrated on writing data to the memory system. At first sight, the memory
+is working a "bit".
+
+ 6.1.2014: After we have learned how to deposit data to the memory and read it
+back, it became clear that there are at least two problems: 1: Depositing
+values in consecutive memory addresses fails, and 2: two out of 15 bits are
+missing at all, causing parity errors.
+
+
+ 8.1.2014: The second error was found rather quickly: One "head connector" was
+missing from the second memory module. We fail to understand how such an item
+can get lost. The first error is harder to find.
+
+ 11.1.2014: The first error turns out to be a show-stopper: The address
+generation is working fine but the driver for the address lines 11, 12, 13,
+and 14 is missing since there is no board 7342! Somehow this has been removed
+from the machine! That is the worst case for every restoration project! A
+closer inspection revealed, that a second board, 4628, is also missing from
+the printer control. We are now looking desperately for replacement boards or
+at least the schematics. If you can help, please let us know! (Pictures
+of the missing boards can be found in the "Wanted" area of this web site.)
+
+
+
Continuation follows
+ + Index: en/wanted.php =================================================================== --- en/wanted.php (revision 489) +++ en/wanted.php (revision 496) @@ -9,8 +9,10 @@ -We soon get a complete IBM 1130 ("electronic computing system"), built circa 1965/66.
-Therefore we are looking for anything that can be raise for this computer: Manuals, programs and boards especially with the small monolithic ICs.
-Old IBM engineers: Please browse through your basement, whether you still can find something about IBM 1130 System. Thank you very much!
+ We are urgently looking for the Boards "4628" (16 bit register) and "7342" (address driver) from IBM for our IBM 1130 system. It would be helpful to have the schematics for these boards. If you can help, please let us know!
+Also other boards with SLT technology, we could well use.