4 Oct
2013
4 Oct
'13
4:38 p.m.
On 10/3/2013 9:49 PM, Jos Dreesen wrote:
On 10/04/2013 12:49 AM, Josh Dersch wrote:
Thanks. That looks like some very intense repair! Lucky that broken
core was on thecorner :). I'm going to have to get a much more powerful
magnifying glass to scope things out on the Imlac's core planes. Here's
a pic of what I have to work with:
https://plus.google.com/u/0/photos/117997069161125071032/albums/58769649993…
and
https://plus.google.com/u/0/photos/117997069161125071032/albums/58769649993…
(where you can see an earlier repair...)
I'm hoping that the cores are OK, but given the way things are failing
it seems pretty likely. I do have a second core set for this machine
(the pictures above are actually of that set); the logic board is in
much, much worse condition but maybe the core plane is OK. I may swap
the two at some point and see ifthe other works any better.
Thanksagain,
Josh
Anyone with more experience here have any
suggestions?
Here you can see some pictures from my attempts at repairing some 8L
core memories :
ftp://jdreesen.dyndns.org/ftp/Cores/
I found dead / duff diodes , old solder joints of original repairs
that had gone high-ohmic, and broken cores.
You want to make sure that all diodes have the same forward voltage
when measured, and all wires have the same resistance. ( except for
the sense line of course )
good luck should you find broken cores....
Jos