6 Sep
2016
6 Sep
'16
2:52 p.m.
Brad,
You'll need to make electrical measurements, from the system checkout in
the manual. You very possibly will have marginal components that need to
be replaced, but it's best to try to locate which is bad rather that to
replace
at random.
A000 is not the same place as 0100. In the 64K
space, they're quite
distant.
Eliminate all but the one RAM board, setting it to
0000. Test that
thoroughly, then add the next at the next RAM space beyond the
first card.
Continue until you have enough RAM for a minimal
Flex boot. It should
tell you in the version of Flex you're using how much
that is (24K?) It's
hard to do everything at ?>the same time, break it down into chunks..
Bill
Thanks Bill. I've tried working with just single RAM boards, but like I
said, the only one that will work at all is this modified board. I have
pics of it here:
https://drive.google.com/folderview?id=0B4pq0-BHd2x6WVFiZHdyMHBlNW8&usp=
sharing
If I could understand better what it is set up to do, what address spaces
its occupying, I might be able to understand why my 16K DRC boards don't
work when I try to put them to $A000. I'd prefer to work with one of those
boards first since the chips are socketed, and then I could test the chips
individually and be sure one whole board is good.
I note in one of my pics there, the cap on that modified MP-M looks a
little tarnished on the outside...