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Apsuvax.1015 net.bugs utzoo!decvax!ucbvax!ARPAVAX:mhtsa!allegra!psuvax!red Wed Dec 23 13:10:02 1981 VAX memory controller bug Our VAX 11/780 with 1.5Mb of memory was recently diagnosed as having memory controller problems due to 74S373 ICs which were unable to drive a high capacitance load. This problem apparently manifests itself only in systems with more than 1Mb of memory, and may be either cause intermittent or consistent failures. On our particular system the symptoms were initially intermittent and gradually became more serious. Two VAXen delivered within a week of each other (6/80) to the CmpSc and EE departments here at Penn State were both found to have "possibly" faulty chips (Texas Instrument 74S373 with a date code of 7840A or later). Replace- ment of the controller board has apparently solved our problem.

- Ralph Droms (psuvax!red)

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