I am putting my standard LET chips back in and taking the phase chips out (and before anyone starts a rumour, NO it is not because I am unhappy with them but because I'm selling them as I need the money and I am rebuilding the car as close to standard as possible).
The problem is when I took the standard ones out I wrote on a piece of paper which one went where i.e. top circuit board and bottom board. Unfortunately I have lost the piece of paper and now need to know which one goes where. They both have different identification numbers on them and I assume that all these chips will have the same numbers on e.g. all boost chips = a certain number etc etc.
I am at work at the moment and don't have them to hand but if there is anyone out there who knows about this please could you let me know.
They are both 27C256 chips, i.e. the same electrically. You can put the ECU together with either in any hole. Test it before you put the whole ECU back in it's case. It'll either be wrong, or right ( car will start or won't! ) If it doesn't start, just swap the chips round.