20 Jan
2019
20 Jan
'19
7:11 p.m.
On January 20, 2019 at 3:56 PM Fritz Mueller via
cctalk <cctalk at 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
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