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Many years ago the company I worked for had a 3031. We added the AP to it. Soon after, we started experiencing random 0Cx abends that made no sense when the dump was examined. The abends were in user and IBM code. CEs could find no problem so it had to be software. The PSR agreed that the data in the dump was valid. There were even samples where registers were wrong (did not match the storage that they were loaded from). HW started looking again. The problem did not occur with the AP offline. The problem was narrowed down to the TLB, with it off all was good. Replaced TLB. Still failed. An old CE came in with a data scope. The problem - the TLB was receiving the "here's data" signal 1.5ms ahead of the data, causing the TLB to load with all 1 bits. There was an optional EC that reduced a section of tri-lead by 18 inches. The EC fixed the problem.
------------------------------------<unsnip>------------------------------- We had a similar problem on a 158 w/AP at Trailer Train, many moons ago. Rick ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
