1. A method for repairing an integrated circuit of the type comprising a multitude of memory arrays and a fuse box holding control data for controlling redundancy logic of the arrays, the method comprising the steps of: providing the integrated circuit with a control data selector, in series between the fuse box and the memory arrays, for passing the control data from the fuse box to the memory arrays; providing a source of alternate control data, external of the integrated circuit; connecting the source of alternate control data to the control data selector; and at a given time, passing the alternate control data from the source thereof, through the control data selector and to the memory arrays to control the redundancy logic of the memory arrays, including the step of at said given time, applying a selector enable signal to the control data selector to enable said selector to pass the alternate control data to the memory arrays.