> On January 20, 2019 at 3:56 PM Fritz Mueller via cctalk > <cctalk@classiccmp.org> wrote: > > > > I'm technically curious, now, about the failure modes of these sorts of > DRAMS. I guess in addition to stuck bits, there are also potential decode > fails (show up on address test, but not ones/zeros) and some errors that have > history-dependence, perhaps internal latches (show up on random data test, > but not address or ones/zeros.) I'd guess also there might be potential for > crosstalk, noise, and "fading bit" type issues as well? Will have to see > after I make the next round of repairs if there are still additional problems > that the MAINDEC flags that my simplistic diag isn't shaking out. >
Jack Ganssle wrote a couple of articles about memory testing and failure modes. They may be useful or at least interesting. http://www.ganssle.com/articles/aramrom.htm http://www.ganssle.com/articles/ramtest.htm Will "He may look dumb but that's just a disguise." -- Charlie Daniels "The names of global variables should start with // " -- https://isocpp.org
