64-Pin chip, 21-pin ribbon cable

Alright i see how to make a 21 pin mod chip work with a 20pin ribbon cable for use with the 64-pin ic. but what about the people that have the 64pin chip but with the 21-pin ribbon cable? its a model two looking inside, where it is all on one board, take a look. how do i mod this with racketboys mod chip?

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