Another update on this if there is anyone still interested.... this corrosion is a bastard. I was very meticulous with what i had repaired etc... but now im finding that some of what tested good at the start now doesnt. The area that the corrosion has gone to is a lot further than i first thought.
Seems that there are some very fine line breaks in the traces that can test good on the bench and then surface once board is installed... how far they go, i have no idea as i thought id dealt with all the corrosion already.
My problem of course now is even if i do get it running, i have no idea just how long it will last... lasted just 2 power ups before!
I am having some success though... only TP6 ( Out counter) is faulty now..... Power Failure Reset is also, but this wont rectify till CPU boots.
Ill post a pic of the board... i have wire traces all over it now
