27 Sep
2014
27 Sep
'14
8:13 a.m.
On Sep 27, 2014, at 4:28 AM, Simon Claessen <simski at dds.nl> wrote:
we take the same approach now and identified some bad
memory locations in page 0. I suspect more bad locations on page 1 as it is on the same 8k
board assembly. we have not touched the extra 16kword board yet.
the problem is that bad locations read 0000: clear the ac... not handy. we program around
that by jumping a lot?
Have you found bad words that have some bits stuck at zero but not others? Having a whole
word zero is peculiar. I was going to blame the write circuitry but it seems strange for
that to mess up a whole word since each bit is separate circuitry. On the other hand,
marginal select circuits might break whole words.
paul