Index: en/computer/ibm1130.php
===================================================================
--- en/computer/ibm1130.php (revision 664)
+++ en/computer/ibm1130.php (revision 667)
@@ -91,51 +91,8 @@
the printer control.
-
7.6.2014: The card 7432 we are looking for is only used in systems with a memory
-expansion. These mainframes are much rarer than the smaller IBM 1130 systems
-without the additional left enclosure. Therefore both, the card missing in
-out machine as well as its schematics have apparently not been preserved.
-Accordingly, we reverse-engineered the circuit diagram based on measurements
-on an existing card and rebuilt the card. Now the core memory of our IBM 1130
-is working like a charm which is a significant milestone.
-
-
16.6.2014: Giant leaps: After an intensive cleaning effort with adjustments following,
-the card reader IBM 1442 is now fully operational and we could successfully
-run the seven so-called "One-Card-Diagnostic" programs. This demonstrated
-that the CPU is at least basically operating (since these tests are quite
-simple in nature they can not detect subtle faults).
-The next test involved the console printer: A working console printer is necessary to communicate
-with the machine - unfortunately, this test showed that the printer is still
-faulty. Currently, we suspect resinified oil as the culprit.
-
-
31.08.2014: We would like to thank the people from the "Verein fuer ein Museum
-der Lochkartentechnik", cosecans.ch, who donated a set of plug in cards
-for the IBM 1131 processor. Without these spares our repair attempts would be
-next to impossible due to the SLT technology.
- Further tests showed that memory and CPU test run flawlessly but the
-keyboard/printer-test still fails.
-
-
07.09.2014: We experienced some set-backs during our initial restoration
-attempts. This was not that unexpected since the machines have been sitting
-idle for several decades. We have at least two different problems in the
-machine. Without diagnostic programs, any repair attempt would be in vain. Just
-the keyboard/printer test shows two errors:
-
-1) After running for some time, the attempt to read programs from punched cards
-will print out "E0004 CKSUM" on the console typewriter which denotes a
-checksum error; the checksum stored on the card differs from that computed by
-the CPU based on the data read. Possible causes for this type of error are
-missing/wrongly placed cards, reader errors or a CPU error. The first
-possibility can be ruled out, so the error is either in the reader or in the
-CPU.
-
-2) The second error we experience is "E0001 INVLD" denoting an erroneous
-address in the switch register for that particular test. Unfortunately the
-address set on the switches is correct so another problem is still lurking in
-the machine.
-
-
-
This section will be gradually continued.
-
IBM 1130 Reparation blog archives
+
+
+
IBM 1130 Reparation blog continuation
Index: en/devices/ibm1130-blog.php
===================================================================
--- en/devices/ibm1130-blog.php (revision 664)
+++ en/devices/ibm1130-blog.php (revision 667)
@@ -7,5 +7,53 @@
?>
-
IBM 1130 Reparation Blog
+
IBM 1130 Reparation Blog, continuation
-
Here to be dragons
+
+
+The beginning you'll find here
IBM-Blog, start
+
+
+
7.6.2014: The card 7432 we are looking for is only used in systems with a memory
+expansion. These mainframes are much rarer than the smaller IBM 1130 systems
+without the additional left enclosure. Therefore both, the card missing in
+out machine as well as its schematics have apparently not been preserved.
+Accordingly, we reverse-engineered the circuit diagram based on measurements
+on an existing card and rebuilt the card. Now the core memory of our IBM 1130
+is working like a charm which is a significant milestone.
+
+
+
+
So it looks while repairing. Invisible: Measuring Park and many simultaneously opened Manuals.
+Enlarge: click on picture!
+
+
16.6.2014: Giant leaps: After an intensive cleaning effort with adjustments following,
+the card reader IBM 1442 is now fully operational and we could successfully
+run the seven so-called "One-Card-Diagnostic" programs. This demonstrated
+that the CPU is at least basically operating (since these tests are quite
+simple in nature they can not detect subtle faults).
+The next test involved the console printer: A working console printer is necessary to communicate
+with the machine - unfortunately, this test showed that the printer is still
+faulty. Currently, we suspect resinified oil as the culprit.
+
+
31.08.2014: We would like to thank the people from the "Verein fuer ein Museum
+der Lochkartentechnik", cosecans.ch, who donated a set of plug in cards
+for the IBM 1131 processor. Without these spares our repair attempts would be
+next to impossible due to the SLT technology.
+ Further tests showed that memory and CPU test run flawlessly but the
+keyboard/printer-test still fails.
+
+
07.09.2014: We experienced some set-backs during our initial restoration
+attempts. This was not that unexpected since the machines have been sitting
+idle for several decades. We have at least two different problems in the
+machine. Without diagnostic programs, any repair attempt would be in vain. Just
+the keyboard/printer test shows an error:
+
+"E0001 INVLD" denoting an erroneous
+address in the switch register for that particular test. Unfortunately the
+address set on the switches is correct so another problem is still lurking in
+the machine.
+
+
+
This section will be gradually continued.
+
Index: en/news.php
===================================================================
--- en/news.php (revision 664)
+++ en/news.php (revision 667)
@@ -10,5 +10,5 @@
text: "
A historic 5-bit character decoder from the university. Here it is used as a decryption engine in our experimental workshop."
bild: /shared/photos/kommunikationstechnik/telegrafenalphabet.jpg
- link: /de/kommunikationstechnik/faxtechnik.php#decoder
+ link: /en/communication/fax.php#decoder
- datum: June 2014