Sorry to burden all of you with the same problem. But we have found no one able to address the memory problems of our hp9815a. We have all the manuals. We have had it apart to the keyboard, and though some have high resistance, all keys seem to be functioning. There is something going on with memory access/allocation. It has the extended memory option, so should have 2008 steps. But usually only 136 steps are available in program mode. Once we had about 400 steps available. Sometimes we can access the progarm mode, other times not. I am hoping that one of you folks will be willing to put this thing on your bench and to suss this out for us. We have obtained Dr. Duell's schematics from the Australian site. We are unable to make further progress, ourselves. Thank you. Frank email: fbsimson@pharmacy.wisc.edu
hp9815a repair
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